SUMMARY
Background. Whole-body vibration (WBV) has proven to be an efficient tool in improving the physical qualities of the neuromuscular system, such as increasing muscle strength, performance, joint stability, electromyographic signal, proprioception, among others. Its use in the upper limbs and joint instabilities has shown good immediate results in a single session. The aim of this study was to analyze the acute effects of the use of mechanical vibration on the muscle strength of subjects with shoulder instability.
Methods. 10 athletes in the process of post-surgical rehabilitation of shoulder instability were volunteers in this study. Muscle strength was tested in the internal (IR) and external (ER) rotation movements in the neutral position using isokinetic dynamometry at two angular velocities ‒ 60 and 180º/s in three moments: before, immediately after, and 10 minutes after the application of WBV. The WBV was applied only once, using a frequency of 30 Hz, with the patient assuming the arm flexion position on the platform during 5 series of 30 seconds of stimulation.
Results. The limb with shoulder instability benefited in both movements ‒ ER and IR ‒ and in both angular velocities. The limb without instability, on the other hand, had increased strength only in the RI movements at 60º/s and RE at 180º/s.
Conclusions. It is concluded that a single session of WBV applied directly to the upper limbs is capable of acutely improving muscle strength in both limbs in subjects with shoulder instability, with the affected limb being the most benefited.
Acute Effects of Whole-Body Vibration on Muscle Strength in Subjects with Shoulder Instability
Uriel Sena Lopes Gomes da Silva, Benno Ejnisman
Original Article, 625-632
Keywords: isokinetic dynamometry, shoulder instability., upper limb., vibratory platform, WBV,
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