Contractility of muscle during prolonged static and repetitive dynamic activity.

The contractility of a muscle is considered as the ability to give series of contractions with or without fatigue. In the first part, the work capacity is successively examined for the static and for the dynamic contractions, using the concepts of limit-time, limit-work and critical force or power. In the second part, an attempt is made to compare the two kinds of muscular contraction, using energetic and biomechanic criteria