Effects of Acute Whole-Body Vibration and Flexi-Bar Training on Isokinetic Shoulder Internal and External Rotation Strength

İngilizce (OpenAlex)

In movement and training sciences, the effects of vibration treatments on acute muscle performance are popular research topics. In this study, the effects of acute whole body vibration (WBV) and flexi-bar training on isokinetic shoulder internal and external rotation strength were investigated in high performance group female handball players. Four different training protocols were applied to the study conducted with 16 healthy adult female handball players (age: 21.31 ± 1.45; mass: 69.47 ± 28.21). Participants took a modified push-up position and participated in bench press force treatments on a non-vibrated and vibrated (30 Hz 4 mm, 50 Hz 4 mm) surface. In addition, the participants performed the same movement form in a sitting position using a flexi bar. To determine the effects of four different protocols (30 sec × 6 sets with 30 sec rest) isolating the lower extremities on the shoulder rotator cuff muscle muscles, the strength of the shoulder rotator cuff muscles was measured with an isokinetic dynamometer at speeds of – 60 and 180°/s before and immediately after the treatment. Findings showed that 30 Hz WBV treatment decreased mean force in shoulder internal rotation muscles (p = 0.043), while 50 Hz WBV decreased maximum torque and mean force (p = 0.022, p = 0.026). Flexi-bar exercises were found to negatively affect the maximum torque (p = 0.007), work per repetition (p = 0.006) and mean strength (p = 0.004) values of the shoulder external rotation muscles. As a result, it was observed that WBV (30 Hz and 50 Hz 4 mm) and flexi-bar treatmnets caused a significant decrease in the strength of the internal rotator muscles, and WBV treatmnets had a statistically more significant effect on the external rotator muscles than the flexi-bar application.