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The effects of shoulder load and pinch force on electromyographic activity and blood flow in the forearm during a pinch task

机译：挤压任务期间肩部负荷和挤压力对肌电活动和前臂血流的影响

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摘要

The object of the current study was to determine whether static contraction of proximal musculature has an effect on the blood flow more distally in the upper extremity. Static contractions of muscles in the neck shoulder region at three levels (relaxed, shoulders elevated and shoulders elevated loaded with 4.95 kg each) were combined with intermittent pinch forces at 0, 10 and 25% of the maximum voluntary contraction (MVC). Blood flow to the forearm was measured with Doppler ultrasound. Myoelectric activity of the forearm and neck-shoulder muscles was recorded to check for the workload levels. Across all levels of shoulder load, blood flow increased significantly with increasing pinch force (21% at 10% MVC and by 44% at 25% MVC). Blood flow was significantly affected by shoulder load, with the lowest blood flow at the highest shoulder load. Interactions of pinch force and shoulder load were not significant. The myoelectric activity of forearm muscles increased with increasing pinch force. The activation of the trapezius muscle decreased with increasing pinch force and increased with increasing shoulder load. The precise mechanisms accounting for the influence of shoulder load remains unclear. The results of this study indicate that shoulder load might influence blood flow to the forearm.
机译：当前研究的目的是确定近端肌肉的静态收缩是否对上肢远端的血流有影响。颈部肩部区域肌肉的静态收缩在三个级别（放松，肩膀抬高和肩膀抬高，每个负载4.95 kg）与间歇收缩力相结合，分别为最大自愿收缩（MVC）的0％，10％和25％。用多普勒超声测量流到前臂的血流量。记录前臂和颈肩肌肉的肌电活动，以检查工作量水平。在所有级别的肩负重上，血流都随着捏力的增加而显着增加（MVC为10％时为21％，MVC为25％时为44％）。肩部负荷显着影响血流，最高肩部负荷具有最低血流。捏力和肩负重的相互作用不显着。前臂肌肉的肌电活动随捏力的增加而增加。斜方肌的激活随着捏力的增加而降低，并随着肩膀负荷的增加而增加。解释肩负重影响的精确机制仍不清楚。这项研究的结果表明，肩负重可能影响到前臂的血流。

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