The Effect of Whole Body Vibration Exercise Applied at Different Environment Temperatures on Distribution of Irisin Hormone in Muscle Tissue

Abstract In recent years, the effect of vibration applications on the endocrine system is a subject which has been discussed. Studies have shown that muscle contractions cause some responses in the endocrine system. This study aimed to determine the effects of whole body vibration (WBV) exercise applied at different environmental temperatures on the distribution of the irisin in muscle tissue. In our study, 30 healthy and adult female rats were used. Rats were divided into four groups as a control group (n = 6) and three different experimental groups (n = 8). 1st experimental group at 15 ± 0.5˚C, 2nd experimental group in normal room conditions, 3rd the experimental group at 35 ± 0.5˚C applied WBV exercise 5 sessions a week, 20 minutes in each session for 4 weeks. The control group rats were kept in vibration cassettes at normal room temperature, with the same number and duration of sessions, without WBV exercise. After all experimental procedures were completed, samples of skeletal muscle (M.gastrocnemius) tissue taken from the rats in the groups were used as material. When the localization and distribution of irisin in the skeletal muscle tissue were examined, it was determined that irisin was secreted from both muscle fibers and connective tissue in all groups, and the concentration of irisin synthesized from muscle fiber was the highest in the 3rd experimental group (p < 0.05). As a result, in this study, WBV exercise applied in a hot environment increases the level of irisin in muscle tissue more than WBV exercise applied in a cold environment and at room temperature.