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- W1575980906 abstract "Muscle fatigue is defined as an exercise-induced reduction in the force-generating capacity of muscle. Here, we investigated the effect of muscle fatigue on hand dexterity. Healthy adults (n = 17) gripped and lifted an object (0.342 kg) five times before and after two interventions. The interventions, performed on separate days, involved 2 min of rest (control) or sustained maximal pinch grip that reduced maximal force by 60% (fatigue). Horizontal grip force (GF), vertical lift force (LF) and first dorsal interosseous electromyographic activity (EMG) were measured. The lift (dynamic) and hold (stationary) phase of the task were analysed. Before the intervention, there was no significant difference between the control and fatigue conditions for the 15 measured parameters. However, post-intervention GF was reduced with fatigue compared with the control condition (hold phase), whereas GF coefficient of variation (hold phase) and root mean square EMG (lift phase) increased with fatigue. Fatigue also disrupted the temporal relationship between GF and LF (assessed by cross-correlation of the derivative of GF and LF). The maximum cross-correlation coefficient was significantly reduced with fatigue compared with the control condition. Grip strategy and the kinetics of the lifting movement (minimum LF, maximum LF, maximum derivative of LF, and maximum acceleration) were unchanged with fatigue. Our results suggest that fatigued subjects generate more EMG to lift and hold an object but produce less force and are less able to match changes in LF with changes in GF. Fatigued subjects also exhibit greater fluctuation in GF while holding objects." @default.
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- W1575980906 date "2010-10-29" @default.
- W1575980906 modified "2023-10-17" @default.
- W1575980906 title "Change in manipulation with muscle fatigue" @default.
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- W1575980906 doi "https://doi.org/10.1111/j.1460-9568.2010.07444.x" @default.
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