Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III

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In this article, we quantify the effects of HAL gait training on spatial muscle activity patterns in a patient with SMA type III using multi-channel surface electromyography (SEMG). Methods: A 21-years old male (168 cm, 47.8 kg) with spinal muscular atrophy type III, when diagnosed at 18-years old by genetic screening, participated in this case study. Although he presented with forearm distal muscle weakness, atrophy of the intrinsic muscles of the hand, and neuromuscular fatigue, his activities of daily living is independent. The patient underwent a separate, single 33-minute session of both HAL and treadmill gait training. To evaluate the coefficient of variation (CoV) of force and alterations in the SEMG spatial distribution patterns, modified entropy and CoV of root mean square (RMS) were calculated from the vastus lateralis (VL) muscle before and after the intervention of HAL and treadmill gait training. Each training session was separated by a period of one month to avoid cross-over effects. Results: There was a greater decrease in the ΔCoV of force and an increase in the magnitude of whole VL muscle activation from pre-intervention to post-intervention with the HAL gait training as compared to the treadmill gait training. In response to only HAL gait training, the CoV of RMS was higher, and the modified entropy was lower post-intervention than pre-intervention. Conclusions: Our results support the notion that HAL gait training has a positive benefit on motor output not only in the magnitude of SEMG generated but also the patterns of neural activation." } { "@context": "http://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": "1", "item": { "@id": "https://f1000research.com/", "name": "Home" } }, { "@type": "ListItem", "position": "2", "item": { "@id": "https://f1000research.com/browse/articles", "name": "Browse" } }, { "@type": "ListItem", "position": "3", "item": { "@id": "https://f1000research.com/articles/10-214", "name": "Influence of hybrid assistive limb gait training on spatial muscle..." } } ] } Home Browse Influence of hybrid assistive limb gait training on spatial muscle... ALL Metrics - Views Downloads Get PDF Get XML Cite How to cite this article Nishikawa Y, Watanabe K, Orita N et al. Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.12688/f1000research.50951.2 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. Close Copy Citation Details Export Export Citation Sciwheel EndNote Ref. Manager Bibtex ProCite Sente EXPORT Select a format first Track Share ▬ ✚ Research Article Revised Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] Yuichi Nishikawa https://orcid.org/0000-0002-0088-8447 1 , Kohei Watanabe 2 , Naoya Orita 3 , [...] Noriaki Maeda 4 , Hiroaki Kimura 5 , Shinobu Tanaka 1 , Allison Hyngstrom 6 Yuichi Nishikawa https://orcid.org/0000-0002-0088-8447 1 , Kohei Watanabe 2 , [...] Naoya Orita 3 , Noriaki Maeda 4 , Hiroaki Kimura 5 , Shinobu Tanaka 1 , Allison Hyngstrom 6 PUBLISHED 21 May 2021 Author details Author details 1 Faculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, Ishikawa, 920-1192, Japan 2 Laboratory of Neuromuscular Biomechanics, School of Health and Sports Sciences, Chukyo University, Nagoya, Aichi, 470-0393, Japan 3 Division of Rehabilitation, Department of Clinical Practice and Support, Hiroshima University Hospital, Hiroshima, Hiroshima, 734-8551, Japan 4 Division of Sports Rehabilitation, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Hiroshima, 734-8551, Japan 5 Department of Rehabilitation Medicine, Hiroshima University Hospital, Hiroshima, Hiroshima, 734-8551, Japan 6 Department of Physical Therapy, Marquette University, Milwaukee, Wisconsin, 53233, USA Yuichi Nishikawa Roles: Conceptualization, Data Curation, Formal Analysis, Investigation, Methodology, Project Administration, Resources, Software, Supervision, Validation, Visualization, Writing – Original Draft Preparation, Writing – Review & Editing Kohei Watanabe Roles: Methodology, Writing – Original Draft Preparation, Writing – Review & Editing Naoya Orita Roles: Formal Analysis, Investigation, Methodology Noriaki Maeda Roles: Methodology, Writing – Original Draft Preparation, Writing – Review & Editing Hiroaki Kimura Roles: Methodology, Project Administration, Writing – Original Draft Preparation, Writing – Review & Editing Shinobu Tanaka Roles: Data Curation, Formal Analysis, Writing – Original Draft Preparation, Writing – Review & Editing Allison Hyngstrom Roles: Supervision, Validation, Visualization, Writing – Original Draft Preparation, Writing – Review & Editing OPEN PEER REVIEW DETAILS REVIEWER STATUS This article is included in the Japan Institutional Gateway gateway. Abstract Background: Despite the potential benefits, the effects of Hybrid Assistive Limb (HAL) gait training on changes in neuromuscular activation that accompany functional gains in individuals with spinal muscular atrophy (SMA) type III is not well known. In this article, we quantify the effects of HAL gait training on spatial muscle activity patterns in a patient with SMA type III using multi-channel surface electromyography (SEMG). Methods: A 21-years old male (168 cm, 47.8 kg) with spinal muscular atrophy type III, when diagnosed at 18-years old by genetic screening, participated in this case study. Although he presented with forearm distal muscle weakness, atrophy of the intrinsic muscles of the hand, and neuromuscular fatigue, his activities of daily living is independent. The patient underwent a separate, single 33-minute session of both HAL and treadmill gait training. To evaluate the coefficient of variation (CoV) of force and alterations in the SEMG spatial distribution patterns, modified entropy and CoV of root mean square (RMS) were calculated from the vastus lateralis (VL) muscle before and after the intervention of HAL and treadmill gait training. Each training session was separated by a period of one month to avoid cross-over effects. Results: There was a greater decrease in the ΔCoV of force and an increase in the magnitude of whole VL muscle activation from pre-intervention to post-intervention with the HAL gait training as compared to the treadmill gait training. In response to only HAL gait training, the CoV of RMS was higher, and the modified entropy was lower post-intervention than pre-intervention. Conclusions: Our results support the notion that HAL gait training has a positive benefit on motor output not only in the magnitude of SEMG generated but also the patterns of neural activation. READ ALL READ LESS Keywords Gait training, Rehabilitation, Spinal muscular atrophy type III, Electromyography, Hybrid assistive limb Corresponding Author(s) Yuichi Nishikawa ( [email protected] ) Close Corresponding author: Yuichi Nishikawa Competing interests: No competing interests were disclosed. Grant information: The author(s) declared that no grants were involved in supporting this work. Copyright: © 2021 Nishikawa Y et al . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. How to cite: Nishikawa Y, Watanabe K, Orita N et al. Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.12688/f1000research.50951.2 ) First published: 16 Mar 2021, 10 :214 ( https://doi.org/10.12688/f1000research.50951.1 ) Latest published: 21 May 2021, 10 :214 ( https://doi.org/10.12688/f1000research.50951.2 ) Revised Amendments from Version 1 In the section on methods, we revised the section on ethics. In the section on methods, we revised the section on ethics. See the authors' detailed response to the review by Redha Taiar READ REVIEWER RESPONSES Introduction Several clinical trials of robot-assisted gait training have been reported in neurology patients. 1 – 4 In particular, the Hybrid Assistive Limb (HAL) gait training has resulted in improved gait and balance performance. 1 , 3 , 5 The HAL exoskeleton is completely driven by the patient’s own muscle activation, which is detected by surface electrodes on key lower extremity muscle groups. Thus, this self-initiated robotic-assisted movement has the potential to induce a somatosensory feedback-loop that enhances neural plasticity and locomotor function. 6 Although many previous studies have reported functional gains due to the HAL intervention (e.g., gait and balance), 1 , 3 , 5 , 7 there are no studies that report its effects on neuromuscular activation likely to accompany functional gains. Understanding how HAL training changes neuromuscular activation patterns, will help in the evaluation and use of HAL training across various populations. Multi-channel surface electromyography (SEMG) is a recently developed techniques used to evaluate single motor unit firing behavior and whole muscle EMG patterns of activity by using multiple electrodes arranged in a two-dimensional plane. 8 – 10 This technique provides data on the spatial distribution of SEMG within a muscle. Previous studies have demonstrated that the spatial distribution of SEMG is altered by contraction levels or fatigue during isometric contraction. 11 , 12 This phenomenon has been explained by a spatial inhomogeneity in the location of different types of muscle fibers 13 and a clustering of muscle fibers innervated by one motor unit in a limited territory. 14 – 16 Previous studies have demonstrated that alterations in the multi-channel SEMG spatial distribution pattern can be explained by the physiological phenomenon of motor unit recruitment and suggested that the multi-channel SEMG spatial distribution pattern could be used to study changes in motor unit recruitment patterns. 15 , 17 In addition, previous studies have used metrices such as the inhomogeneity of the spatial distribution pattern of SEMG (EMG variables; modified entropy and coefficient of variation (CoV) of root mean square (RMS) 11 , 18 to quantify neuromuscular fatigue and the influence of force generation. The assessment of motor unit recruitment is very important for determining the effect of neurorehabilitation on neuroplasticity in patients with several types of neurological conditions. Thus, we considered that this technique (i.e., multi-channel SEMG) could be employed as a new assessment tool to evaluate changes in muscle activation as a metric of neuroplasticity in response to HAL training. Individuals with spinal muscular atrophy (SMA) type III present with progressive proximal weakness of the legs more than arms, and the leg weakness is so profound that it can necessitate the long term need of a wheelchair for mobility. 19 Rehabilitation is one treatment for SMA type III. The main objectives for rehabilitation of individuals with SMA type III who are still able to walk are to maintain, restore or promote function, mobility, and adequate joint range, and improve balance and endurance. 20 HAL gait training has been an insurance supported therapy since January 2016, and SMA, amyotrophic lateral sclerosis, spinal bulbar atrophy, Charcot-Marie-Tooth disease, inclusion body myositis, distal myopathy, and congenital myopathy are targeted disease populations. Although approved by insurance, there is limited information on how the effectiveness of HAL training compares to other forms of therapy. Specifically, there is no report which compares HAL and conventional treadmill gait training on neuromuscular activation in SMA patients that likely accompany improvements in walking function. Therefore, the aim of this case report to quantify the effects of a single session of HAL gait training on SEMG spatial distribution patterns in a person with spinal muscular atrophy type III. We hypothesized that HAL gait training would induce more heterogenous muscle activation reflecting more varied motor unit recruitment than treadmill gait training. Methods Participant background and examination A 21-year-old male (168 cm, 47.8 kg) with spinal muscular atrophy type III when diagnosed at 18-years old by genetic screening participated in this study. Written informed consent was obtained from the patient to perform the two types of gait training and to publish the obtained his anonymized data to be published in this article. All procedures were performed in accordance with the Declaration of Helsinki and were approved by the Hiroshima University’s Committee on Ethics in Research (approval Number No. E-53). He presented with forearm distal muscle weakness, atrophy of the intrinsic muscles of the hand, and neuromuscular fatigue. The patient’s baseline physical performance data are shown in Table 1 . The age-matched normative values for knee extension strength and six minutes walking test (6MWT) are 2.82±0.38 Nm/kg and 637 m. 21 , 22 The participants’ knee extension strength (Right: 1.59 Nm/kg, Left; 1.32 Nm/kg) and 6MWT (567 m) were lower than the above value, and we have chosen the weaker leg to measure EMS recording. Table 1. Participant’s physical function. Variables Muscle strength Knee extension torque, Nm/kg Rt: 1.59, Lt: 1.32 10m walk speed, sec 5’28, 15 steps Timed up and Go test, sec 5’53 Single leg standing, sec Rt: 60<, Lt: 20’46 6 minutes walking test, m 567 The participant performed maximal isometric voluntary contractions (MVC) of the knee extensors bilaterally at the pre- and post-intervention. Isometric knee extension was performed using a Biodex system (Biodex System 4; Biodex Medical Systems, Shirley, NY, USA). During contractions, both the hip and knee extension angles were positioned at 90 degrees. The MVC involved a gradual increase in knee extension torque from 0 Nm to his maximum torque over three seconds, with the maximum torque being held for two seconds. The participant performed at least two MVC trials with > 120 s of rest between trials and a warm-up for 10 min, including indoor walking and lower limb stretching before the MVC measurement. 23 The peak MVC torque was used as the maximal effort and to calculate the target torque for the isometric sub-maximal ramp-up contractions. After MVC measurements, the participant performed an isometric submaximal ramp-up contraction of the knee extensors in the weaker leg one time from 0% to 80% of the MVC force with an increase rate of approximately 10% of the MVC per sec. 24 , 25 The participant-generated torque and target torque were displayed on a computer monitor. Prior to motor testing, the participant practiced the MVC and sub-maximal ramp-up contraction at least 10 min before the motor testing session began. The CoV of force (standard deviation (SD)/mean x 100, CV force) was calculated from the ramp up contraction task. EMG recording During the sub-maximal contraction, multi-channel SEMG signals were detected from the weaker side of vastus lateralis (VL) muscle using a semi-disposable grid of 64 electrodes (ELSCH064NM2; OTBioelettronica, Torino, Italy) according to the same procedures used in previous studies. 23 , 24 , 26 , 27 The grid consisted of 13 columns and five rows of electrodes (diameter, 1mm; inter-electrode distance, 8mm in each direction), with one missing electrode in the upper left corner. The participant’s thigh hair was removed, and the skin was cleaned with alcohol. The electrode was attached to the skin with a bi-adhesive sheet (KITAD064NM2; OTBioelettronica) after a conductive paste (Elefix Z-181BE; NIHON KOHDEN, Tokyo, Japan) was applied. The center of the electrode grid was positioned at the center of the line between the superior lateral edge of the patella and the greater trochanter protuberance. The columns of the electrode grid were placed parallel to the longitudinal axis of the VL muscle. A reference electrode was attached at the anterior superior iliac spine. 23 , 24 , 26 , 27 All procedures were performed by the same investigator. Monopolar multi-channel surface EMG signals (64 channels) were amplified by a factor of 1000, sampled at 2048 Hz, and digitized by a 12-bit analog-to-digital converter (EMG-USB2+, OTBioelettronica). The recorded monopolar signals were off-line bandpass filtered (10-500 Hz) and transferred to analysis software (MTALAB 2019a, MathWorks GK, MA, USA). Bipolar multi-channel SEMG signals (n = 59) along the columns were obtained from the 64 electrodes. The EMG signals were divided in epochs of one second centered at each 10% of MVC force increment from 10% to 80% of the MVC ramp-contraction to calculate the root mean square (RMS). 24 Since the selected ramp rate was 10% of the MVC force per second, one epoch of the sampled signal was overlapped by 0.5 seconds between neighboring torque levels. We normalized the RMS estimates to the values obtained pre-intervention for each torque level. To characterize the heterogeneity in the multi-channel SEMG spatial distribution pattern at each epoch, we determined the modified entropy and correlation coefficients. The modified entropy of the spatial distribution of the ΔSEMG amplitude was calculated over a 1-s epoch taken at 10% to 80% of the MVC during the ramp-up contraction. According to methods published by Farina et al., modified entropy was defined as the entropy of the signal power as follows: 11 E = − ∑ i = 1 59 p i 2 log 2 p i 2 , where p ( i ) is the square of the RMS value of channel i divided by the sum of the squares of all 59 RMS values at the given contraction level. Therefore, p ( i ) 2 represents the normalized power of each channel. Modified entropy is the normalized power of the EMG signal across the array and reflects the heterogeneity in the muscle activity. The CoV of the RMS was defined as the quotient of the SD of the Δ59 RMS measurements and the average of Δ59 RMS measurements at each given torque level. 24 Both a decrease in modified entropy and an increase in CoV of RMS indicate increased heterogeneity in the multi-channel SEMG spatial distribution pattern within the electrode grid. 12 , 18 Measures of the CoV of the RMS and modified entropy provide insight into how the nervous system regulates muscle activation across the muscle irrespective of the magnitude. 28 Intervention The patient performed two types of gait training separated by a period of one month between training to avoid training effect. HAL gait training The patient performed gait training using the HAL for 33 minutes (gait distance about 2200 m). The double leg type HAL was used for gait training, which was performed with two physical therapists for the operation of the HAL commands and support of the patient. During HAL gait training, a walking hoist (ALL IN ONE walking hoist, ROPOX, Denmark) was used to prevent falls and adjust the patient’s posture. Treadmill gait training The patient performed gait training using the treadmill for 33 minutes (gait speed 4.0 km/h, gait distance about 2200 m). During gait training, Alter-G (Alter-G, Inc., Fremont, CA, USA) was used to prevent falls and adjust the patient’s posture without providing weight bearing and clinician’s support to leg movements. Results As a neuromuscular activation assessment, multi-channel SEMG was performed on the patient before and after both gait training. Figure 1 illustrates the representative multi-channel SEMG amplitude color maps for treadmill and HAL gait training. We normalized the CoV of force and RMS estimates to the values obtained pre-intervention for each torque level. Differences were observed in the multi-channel SEMG spatial distribution pattern at each contraction torque between HAL and treadmill gait training. There was a greater decrease ΔCoV force with the HAL gait training than for treadmill gait training ( Figure 2A ). The increase in the magnitude of muscle activation from pre-intervention to post-intervention was greater for HAL gait training than for treadmill gait training ( Figure 2B ). The CoV of the RMS and modified entropy at each torque in both gait trainings are shown in Figure 3. For HAL training, both the CoV of the RMS were higher and the modified entropy was lower as compared to treadmill gait training ( Figure 2C and D ). No adverse events were observed with either intervention. He did not experience worsening of the symptoms during each gait training. Figure 1. The representative color map during isometric knee extension task. (upper panel) treadmill gait training, (lower panel) HAL gait training. Differences in the multi-channel surface electromyography spatial distribution patterns at each torque level were observed between the treadmill and HAL gait training in these representative data. Figure 2. The force and electromyography variables. The Δ coefficient of variation (CoV) of force (A), Δ root mean square (B), CoV of RMS (C), and modified entropy (D) of the treadmill gait training and HAL gait training. Discussion We applied multichannel SEMG as a neuromuscular activation assessment of HAL training. In addition to the overall increase in EMG activity, the HAL gait training resulted in decrease force fluctuation, and greater heterogeneity in spatial muscle distribution pattern from pre-intervention to post-intervention than for the treadmill gait training. We used two parameters to quantify the multi-channel SEMG spatial distribution pattern: modified entropy and the CoV of the RMS. A decrease in the modified entropy and an increase in the CoV of the RMS are consistent with increased heterogeneity in the multi-channel SEMG spatial distribution pattern within the electrode grid. 25 The SEMG spatial distribution pattern can be altered by contraction levels or fatigue during isometric contraction. 11 , 12 Measures of the CoV of the RMS and modified entropy provide insight into how the nervous system regulates muscle activation across the muscle irrespective of the magnitude. 28 This phenomenon has been explained by spatial heterogeneity in the location of different types of muscle fibers 13 and a clustering of muscle fibers innervated by one motor unit in a limited territory, 14 , 15 and a previous study reported that alterations in the multi-channel SEMG spatial distribution pattern can be explained by the physiological phenomenon of motor unit recruitment patterns. 17 The results of the present report for the HAL training intervention showed that the CoV of the RMS was higher, and the modified entropy was lower than for treadmill gait training. These findings suggest that spatial motor unit activity patterns were enhanced by HAL training. Changes in the heterogeneity of SEMG were accompanied by a greater decreased in the Δ CoV force for the HAL gait training as compared to the treadmill gait training. This finding suggests that the participant was able to perform the submaximal ramp up task smoothly by altered spatial motor unit activity patterns. The HAL gait training offers the possibility to monitor muscle contractions via SEMG at the extensor and flexor muscle region of the lower extremities. 5 , 29 The voluntary drive and normalized motion assistance provided by the external device likely form the foundation for a proprioceptive feedback loop for patients with lesions involving the sensory pathway and not facilitated as well with treadmill training. The neural activity and repeated execution of specific tasks promote learning and lead to the reinstatement or restructuring of appropriate proprioceptive feedback. 30 , 31 Here, we are the first to show that HAL gait training induced an alteration muscle activation patterns due to a single session of HAL training. Moreover, based on our findings, HAL gait training may be more effective in evoking changes in neuromuscular activation than conventional gait training. Future studies will examine the relationship between changes in gait and muscle activation using the HAL intervention across multiple sessions. This report has several limitations. First, report included only one patient with spinal muscular atrophy type III. Future large-sample studies and studies of patients with various neurological conditions (e.g., amyotrophic lateral sclerosis, Parkinson’s disease, and stroke) are needed to clearly understand how generalizable the effects of HAL gait training on neuroplasticity. Second, this report only included data following a single session. Future studies will examine how factors such as dose, frequency, and intensity of HAL training affect changes in function and neuromuscular activation. Conclusions The present case report showed that HAL gait training was more effective in changing metrics of neuromuscular activation of the knee extensors than treadmill gait training despite similar training durations. These data suggest that the modes of gait training which incorporate both voluntary activation and guided movement of the legs may facilitate recovery of function. Consent Written informed consent for publication of their clinical details and/or clinical images was obtained from the patient/parent/guardian/relative of the patient. Data availability Underlying data Figshare: EMG data of VL muscle, https://doi.org/10.6084/m9.figshare.14113178.v1 . 32 Data are available under the terms of the Creative Commons Attribution 4.0 International license (CC-BY 4.0). References 1. Mizui D, Nakai Y, Okada H, et al. : [A case of spinal and bulbar muscular atrophy with improved walking ability following gait training using the hybrid assistive limb (HAL)]. Rinsho Shinkeigaku. Mar 28 2019; 59 (3): 157–159. PubMed Abstract | Publisher Full Text 2. Tanaka H, Nankaku M, Nishikawa T, et al. : A follow-up study of the effect of training using the Hybrid Assistive Limb on Gait ability in chronic stroke patients. Top Stroke Rehabil. Jul 18 2019: 1–6. PubMed Abstract | Publisher Full Text 3. Tanaka H, Nankaku M, Nishikawa T, et al. : Spatiotemporal gait characteristic changes with gait training using the hybrid assistive limb for chronic stroke patients. Gait Posture. Jun 2019; 71 : 205–210. PubMed Abstract | Publisher Full Text 4. 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Publisher Full Text Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 16 Mar 2021 ADD YOUR COMMENT Comment Author details Author details 1 Faculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, Ishikawa, 920-1192, Japan 2 Laboratory of Neuromuscular Biomechanics, School of Health and Sports Sciences, Chukyo University, Nagoya, Aichi, 470-0393, Japan 3 Division of Rehabilitation, Department of Clinical Practice and Support, Hiroshima University Hospital, Hiroshima, Hiroshima, 734-8551, Japan 4 Division of Sports Rehabilitation, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Hiroshima, 734-8551, Japan 5 Department of Rehabilitation Medicine, Hiroshima University Hospital, Hiroshima, Hiroshima, 734-8551, Japan 6 Department of Physical Therapy, Marquette University, Milwaukee, Wisconsin, 53233, USA Yuichi Nishikawa Roles: Conceptualization, Data Curation, Formal Analysis, Investigation, Methodology, Project Administration, Resources, Software, Supervision, Validation, Visualization, Writing – Original Draft Preparation, Writing – Review & Editing Kohei Watanabe Roles: Methodology, Writing – Original Draft Preparation, Writing – Review & Editing Naoya Orita Roles: Formal Analysis, Investigation, Methodology Noriaki Maeda Roles: Methodology, Writing – Original Draft Preparation, Writing – Review & Editing Hiroaki Kimura Roles: Methodology, Project Administration, Writing – Original Draft Preparation, Writing – Review & Editing Shinobu Tanaka Roles: Data Curation, Formal Analysis, Writing – Original Draft Preparation, Writing – Review & Editing Allison Hyngstrom Roles: Supervision, Validation, Visualization, Writing – Original Draft Preparation, Writing – Review & Editing Competing interests No competing interests were disclosed. Grant information The author(s) declared that no grants were involved in supporting this work. Article Versions (2) version 2 Revised Published: 21 May 2021, 10:214 https://doi.org/10.12688/f1000research.50951.2 version 1 Published: 16 Mar 2021, 10:214 https://doi.org/10.12688/f1000research.50951.1 Copyright © 2021 Nishikawa Y et al . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Download Export To Sciwheel Bibtex EndNote ProCite Ref. Manager (RIS) Sente metrics Views Downloads F1000Research - - PubMed Central info_outline Data from PMC are received and updated monthly. - - Citations open_in_new 0 open_in_new 0 open_in_new SEE MORE DETAILS CITE how to cite this article Nishikawa Y, Watanabe K, Orita N et al. Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.12688/f1000research.50951.2 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS track receive updates on this article Track an article to receive email alerts on any updates to this article. TRACK THIS ARTICLE Share Open Peer Review Current Reviewer Status: ? Key to Reviewer Statuses VIEW HIDE Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Version 2 VERSION 2 PUBLISHED 21 May 2021 Revised Views 0 Cite How to cite this report: Cescon C. Reviewer Report For: Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.5256/f1000research.56538.r88730 ) The direct URL for this report is: https://f1000research.com/articles/10-214/v2#referee-response-88730 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 05 Jul 2021 Corrado Cescon , Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland Approved VIEWS 0 https://doi.org/10.5256/f1000research.56538.r88730 The manuscript describes the multichannel EMG analysis of the limb muscle of a patient with muscle atrophy. The patient performed ramp contractions and EMG maps were analyzed computing entropy. The methods are described accurately and the technology used is solid ... Continue reading READ ALL The manuscript describes the multichannel EMG analysis of the limb muscle of a patient with muscle atrophy. The patient performed ramp contractions and EMG maps were analyzed computing entropy. The methods are described accurately and the technology used is solid as well as the equipment used. The results are interesting, well commented and well described. The present reviewer has no additional request for changes. Is the work clearly and accurately presented and does it cite the current literature? Yes Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Yes If applicable, is the statistical analysis and its interpretation appropriate? Yes Are all the source data underlying the results available to ensure full reproducibility? Yes Are the conclusions drawn adequately supported by the results? Yes Competing Interests: No competing interests were disclosed. Reviewer Expertise: Electromyography, biomechanics, rehabilitation I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Cescon C. Reviewer Report For: Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.5256/f1000research.56538.r88730 ) The direct URL for this report is: https://f1000research.com/articles/10-214/v2#referee-response-88730 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Respond or Comment COMMENT ON THIS REPORT Version 1 VERSION 1 PUBLISHED 16 Mar 2021 Views 0 Cite How to cite this report: Taiar R. Reviewer Report For: Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.5256/f1000research.54046.r83012 ) The direct URL for this report is: https://f1000research.com/articles/10-214/v1#referee-response-83012 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 27 Apr 2021 Redha Taiar , Physical and Rehabilitation Medicine Department, Sebastopol Hospital, University of Reims Champagne-Ardenne, Reims, France Approved VIEWS 0 https://doi.org/10.5256/f1000research.54046.r83012 The objective of this study was to quantify the effects of HAL gait training on spatial muscle activity patterns in a patient with SMA type III using multi-channel surface electromyography (SEMG). The authors support in conclusion the notion that HAL ... Continue reading READ ALL The objective of this study was to quantify the effects of HAL gait training on spatial muscle activity patterns in a patient with SMA type III using multi-channel surface electromyography (SEMG). The authors support in conclusion the notion that HAL gait training has a positive benefit on motor output not only in the magnitude of SEMG generated but also the patterns of neural activation. The approach of the study appears very original and the contents of the manuscript are quite interesting by his methodology and through the tools of quantification used. The manuscript reads smoothly and is easy to understand. The aims, scope, and results of the study are clearly stated. I have very much enjoyed reading this paper. I find it interesting and clearly written, and satisfying also all the other publication criteria of the “F1000Research”. The study provides a very valuable addition to this line of research, and adds relevantly to the subject with additional original findings. I thus find that this paper definitively delivers results that will surely be of interest to the readership of the “F1000Research”. I recommend the publication of this interesting paper after more details concerning the Ethical Committee “ All procedures were performed in accordance with the Declaration of Helsinki and were approved by the Hiroshima University’s Committee on Ethics in Research (approval Number No. E-53). Our institution does not require ethical approval for reporting individual cases or case series ”. The details are not clear and must be re writting. For instance " Our institution does not require ethical approval for reporting individual cases or case series ” what I recommend to the authors to delete. Is the work clearly and accurately presented and does it cite the current literature? Yes Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Yes If applicable, is the statistical analysis and its interpretation appropriate? Yes Are all the source data underlying the results available to ensure full reproducibility? Yes Are the conclusions drawn adequately supported by the results? Yes Competing Interests: No competing interests were disclosed. Reviewer Expertise: biomechanics, health disease and rehabilitation I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Taiar R. Reviewer Report For: Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.5256/f1000research.54046.r83012 ) The direct URL for this report is: https://f1000research.com/articles/10-214/v1#referee-response-83012 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Author Response 21 May 2021 Yuichi Nishikawa , Faculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, 920-1192, Japan 21 May 2021 Author Response Dear Prof. Redha Taiar, Thank you for reviewing this paper and helpful comments. We have removed the bellow sentence. " Our institution does not require ethical approval for reporting ... Continue reading Dear Prof. Redha Taiar, Thank you for reviewing this paper and helpful comments. We have removed the bellow sentence. " Our institution does not require ethical approval for reporting individual cases or case series ” Dear Prof. Redha Taiar, Thank you for reviewing this paper and helpful comments. We have removed the bellow sentence. " Our institution does not require ethical approval for reporting individual cases or case series ” Competing Interests: No competing interests were disclosed. Close Report a concern Respond or Comment COMMENTS ON THIS REPORT Author Response 21 May 2021 Yuichi Nishikawa , Faculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, 920-1192, Japan 21 May 2021 Author Response Dear Prof. Redha Taiar, Thank you for reviewing this paper and helpful comments. We have removed the bellow sentence. " Our institution does not require ethical approval for reporting ... Continue reading Dear Prof. Redha Taiar, Thank you for reviewing this paper and helpful comments. We have removed the bellow sentence. " Our institution does not require ethical approval for reporting individual cases or case series ” Dear Prof. Redha Taiar, Thank you for reviewing this paper and helpful comments. We have removed the bellow sentence. " Our institution does not require ethical approval for reporting individual cases or case series ” Competing Interests: No competing interests were disclosed. Close Report a concern COMMENT ON THIS REPORT Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 16 Mar 2021 ADD YOUR COMMENT Comment keyboard_arrow_left keyboard_arrow_right Open Peer Review Reviewer Status info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Reviewer Reports Invited Reviewers 1 2 Version 2 (revision) 21 May 21 read Version 1 16 Mar 21 read Redha Taiar , University of Reims Champagne-Ardenne, Reims, France Corrado Cescon , University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland Comments on this article All Comments (0) Add a comment Sign up for content alerts Sign Up You are now signed up to receive this alert Browse by related subjects keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2021 Cescon C. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 05 Jul 2021 | for Version 2 Corrado Cescon , Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland 0 Views copyright © 2021 Cescon C. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (0) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions The manuscript describes the multichannel EMG analysis of the limb muscle of a patient with muscle atrophy. The patient performed ramp contractions and EMG maps were analyzed computing entropy. The methods are described accurately and the technology used is solid as well as the equipment used. The results are interesting, well commented and well described. The present reviewer has no additional request for changes. Is the work clearly and accurately presented and does it cite the current literature? Yes Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Yes If applicable, is the statistical analysis and its interpretation appropriate? Yes Are all the source data underlying the results available to ensure full reproducibility? Yes Are the conclusions drawn adequately supported by the results? Yes Competing Interests No competing interests were disclosed. Reviewer Expertise Electromyography, biomechanics, rehabilitation I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (0) Cescon C. Peer Review Report For: Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.5256/f1000research.56538.r88730) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/10-214/v2#referee-response-88730 keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2021 Taiar R. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 27 Apr 2021 | for Version 1 Redha Taiar , Physical and Rehabilitation Medicine Department, Sebastopol Hospital, University of Reims Champagne-Ardenne, Reims, France 0 Views copyright © 2021 Taiar R. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (1) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions The objective of this study was to quantify the effects of HAL gait training on spatial muscle activity patterns in a patient with SMA type III using multi-channel surface electromyography (SEMG). The authors support in conclusion the notion that HAL gait training has a positive benefit on motor output not only in the magnitude of SEMG generated but also the patterns of neural activation. The approach of the study appears very original and the contents of the manuscript are quite interesting by his methodology and through the tools of quantification used. The manuscript reads smoothly and is easy to understand. The aims, scope, and results of the study are clearly stated. I have very much enjoyed reading this paper. I find it interesting and clearly written, and satisfying also all the other publication criteria of the “F1000Research”. The study provides a very valuable addition to this line of research, and adds relevantly to the subject with additional original findings. I thus find that this paper definitively delivers results that will surely be of interest to the readership of the “F1000Research”. I recommend the publication of this interesting paper after more details concerning the Ethical Committee “ All procedures were performed in accordance with the Declaration of Helsinki and were approved by the Hiroshima University’s Committee on Ethics in Research (approval Number No. E-53). Our institution does not require ethical approval for reporting individual cases or case series ”. The details are not clear and must be re writting. For instance " Our institution does not require ethical approval for reporting individual cases or case series ” what I recommend to the authors to delete. Is the work clearly and accurately presented and does it cite the current literature? Yes Is the study design appropriate and is the work technically sound? Yes Are sufficient details of methods and analysis provided to allow replication by others? Yes If applicable, is the statistical analysis and its interpretation appropriate? Yes Are all the source data underlying the results available to ensure full reproducibility? Yes Are the conclusions drawn adequately supported by the results? Yes Competing Interests No competing interests were disclosed. Reviewer Expertise biomechanics, health disease and rehabilitation I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (1) Author Response 21 May 2021 Yuichi Nishikawa, Faculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, 920-1192, Japan Dear Prof. Redha Taiar, Thank you for reviewing this paper and helpful comments. We have removed the bellow sentence. " Our institution does not require ethical approval for reporting individual cases or case series ” View more View less Competing Interests No competing interests were disclosed. reply Respond Report a concern Taiar R. Peer Review Report For: Influence of hybrid assistive limb gait training on spatial muscle activation patterns in spinal muscular atrophy type III [version 2; peer review: 2 approved] . F1000Research 2021, 10 :214 ( https://doi.org/10.5256/f1000research.54046.r83012) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/10-214/v1#referee-response-83012 Alongside their report, reviewers assign a status to the article: Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. 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