Abstract
The aim of this study was to investigate electromyographic (EMG) changes reflecting fatigue in different shoulder muscles and the relations between EMG changes and the holding time during the static holding test of the arm. Nine men and nine women held their arm flexed horizontally until exhaustion with a weight (4 kg for the men, 2.5 kg for the women) suspended on the wrist. EMG was recorded by surface electrodes over the upper trapezius (two locations), infraspinatus, and the anterior deltoid muscles. Reduction of the median frequency of the EMG signal was used as indicator of localized muscle fatigue. The times for detecting EMG changes in the deltoid and infraspinatus muscles were about half of that in the upper trapezius. Women and men had similar holding times, but the men showed more EMG changes reflecting fatigue than the women. The EMG changes did not predict the total holding time.
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