ORIGINAL ARTICLES   

Gazzetta Medica Italiana Archivio per le Scienze Mediche 2013 November;172(11):825-34

Copyright © 2013 EDIZIONI MINERVA MEDICA

language: English

Differences of shoulder activities and strengths between thrower and non-throwers on isokinetic device

Park S. Y., Nho H. S., Kim J. K.

Department of Sports Medicine and Science Graduate School of Physical Education, Kyung Hee University, Yongin, Korea

Aim: The aim of this paper was to examine the patterns of electromyography (EMG) activity and torque values during maximal, isokinetic muscle action with shoulder flexion (FlexCon/FlexEcc), abduction (AbdCon/ AbdEcc), and diagonal activities (DiaCon/DiaEcc) for interactions between thrower and non-throwers at 60 and 180°/s on the dynamometer.
Methods: The participants for this investigation were 18 males who assigned to two groups, thrower group of 9 male that volunteered from university students who participate in overhead sports at least three days a week and non-thrower group of 9 healthy male. Each data were compared differences of muscle activities and muscle strengths between thrower and non-thrower groups due to different tasks for each muscle.
Results: Anterior deltoid muscle was significantly greater for thrower than non-thrower group at all of tasks at the 60°/s (P<0.05). Although middle and posterior deltoid muscle activities were generally greater for thrower group than non-thrower group during FlexCon/FlexEcc and AbdCon/AbdEcc at the 180°/s, these muscles were significantly greater for non-thrower than thrower group at DiaEcc (P<0.05, and P<0.001, respectively). Pectoralis major and biceps brachii muscles for higher velocity were found to be dependent for muscle strength on non-thrower group at higher velocity. Peak torque for muscle strength overall was greater muscle strength for thrower group than non-thrower group during isokinetic eccentric muscle testing at the higher velocity.
Conclusion: These findings indicate that in thrower group, shoulder muscle strengths by higher velocity equally elicited all of the upper extremity muscle activities.