摘要: The contribution of posture and grip force to muscle loading has been recognized but not adequately quantified. In six healthy individuals, five handgrip efforts (5%, 50%, 70% and 100% MVC, and 50 N) were performed in each of 9 different postures. Forearm flexor and extensor muscle activity was measured using electromyography (EMG). Extensor activity was substantial, especially with forearm pronation and wrist extension, where it exceeded flexor activity regardless of effort level (p= 0.00016). The common digital extensor was activated to a higher level during flexion than extension, regardless of forearm posture (p= 0.005). When simply maintaining a gripping posture in pronation, extensor activity ranged from 5.1% MVC (flexed wrist) to 10.8% MVC (extension), while flexor activity was 2.1% to 1.6% MVC for the same postures. Specific forearm and wrist postures increase the static load on the extensor muscles, which may lead to increased risk of fatigue or injury.
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