Tyler A E, Hutton R S
Brain Res. 1986 Apr 2;370(1):171-5. doi: 10.1016/0006-8993(86)91119-4.
Differences in electromyographic (EMG) activity between brief isometric maximum voluntary contractions under conditions of agonist contraction and agonist-antagonist co-contractions were assessed for elbow flexors (biceps brachii) and elbow extensors (triceps, long head). Expressing maximum EMG co-contraction activity as a ratio of agonist maximum EMG activity of the same muscle yielded EMG ratios consistently below 1.0 (mean = 0.48 for flexion and 0.76 for extension). Flexor EMG ratios did not co-vary with elbow position but extensor EMG ratios approached 1.0 or sometimes greater at shorter muscle lengths (elbow extension). Findings were in general accord with Sherrington's original proposal of 'double reciprocal innervation'. Neural circuitry designed to limit full muscle activation during co-contractions may serve to protect the joint against excessive tangential or compressive forces.
在主动肌收缩和主动肌-拮抗肌共同收缩条件下，对肘屈肌（肱二头肌）和肘伸肌（肱三头肌长头）进行短暂等长最大自主收缩时，评估其肌电图（EMG）活动的差异。将最大EMG共同收缩活动表示为同一肌肉主动肌最大EMG活动的比率，得到的EMG比率始终低于1.0（屈曲时平均为0.48，伸展时平均为0.76）。屈肌EMG比率不随肘部位置而变化，但伸肌EMG比率在较短肌肉长度（肘部伸展）时接近1.0，有时甚至更高。研究结果总体上符合谢灵顿最初提出的“双重交互神经支配”。旨在限制共同收缩期间肌肉完全激活的神经回路可能有助于保护关节免受过度的切向或压缩力。
