[ short term effects of one-session of whole body vibration training on isokinetic strength of rotator cuff and shoulder proprioception in young healthy subjects]

ABSTRACT

The aim of this study was to determine the effect of onesession of whole body vibration training on isokinetic strength of rotator cuff and shoulder proprioception 32 students experienced three positions including control [no vibration], push up with straight elbow and push up with semi flexed elbow [two vibration positions] for 2 minutes with 30 minutes interval between positions. After control position, vibration positions were tested on a random basis by means of a power plate device [Freq 30Hz and Amp low]. The isokinetic strength of rotator cuff and shoulder proprioception were measured in angle repositioning test in 3 target angles of 0°, 45° and 90° by means of Kin-Com dynamometer before and after each position. Then the results of 3 positions were compared with one another. Despite decreased dynamic strength of medial rotators after 3 positions, this decrease was significantly less in push up with straight elbow than that in control position [p=0.03]. Also there was a significant difference in concentric MPT of lateral rotators between 3 positions so that, control position caused the greatest decline in lateral rotators strength [p=0.01] and push up with straight elbow was more effective than push up with semi flexed elbow [p=0.03]. Moreover, There was a significant improvement in angle repositioning in 3 positions but only in zero degree a significant difference was detected between the push up with semi flexed elbow position and the control position [p=0.03]. No significant change in muscle strength was found between push up with straight elbow and semi flexed elbow positions. Conclusions: The results of this experiment show that a two minute single-session of whole body vibration is relatively a good stimulation for neuromuscular system in young and healthy individuals