The Role of Active and Passive Muscle Forces During Muscle Contraction

In oroder to understand the role of active and passive muscle forces during contraction of the skeletal muscle, low frequency nerve-stimulated rabbits’ triceps surae muscle-tendon unit was tested. The results showed that the maximal passive force of triceps surae muscle was 293.1 N at the strain of 38.0%. The active muscle force reached a peak load of 21.5N at the strain of 21.2%. The ratio of active to passive muscle force (FA/FP ratio) was initially around 50%, then approached to an ultimate value followed with a rapid drop to zero. The maximal FA/FP ratio was 129.0% at the strain of 13.2%. This maximal FA/FP ratio occurred before the peak of active muscle force. However, the FA/FP ratio on the maximal passive force was only 3.3%. This means that at the point of muscle failure the dominating force was mainly contributed by passive component of the muscle force. The results showed that in the initial portion of the load-deformation curve, only little passive muscle force generated with relatively high active muscle force. After the strain of 21.2%, the active muscle force then decreased. If we want to avoid the muscle injury caused by the passive component of the muscle force, we should limit the range of the stretch below the strain of 21.2%. Otherwise, the further stretch will increase the possibility of muscle injury by increasing the passive muscle force.

並列關鍵字

passive muscle force ； active muscle force ； muscle contraction

國際替代計量

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