Residual Force Enhancement Is Attenuated in a Shortening Magnitude-dependent Manner
نویسندگان
چکیده
منابع مشابه
Shortening‐induced force depression is modulated in a time‐ and speed‐dependent manner following a stretch–shortening cycle
The steady-state isometric force following active muscle shortening or lengthening is smaller (force depression, FD) or greater (residual force enhancement, RFE) than a purely isometric contraction at the corresponding length. The mechanism underlying these phenomena is not explained within the context of the cross-bridge theory, with few studies investigating the effects of FD and RFE in stret...
متن کاملMuscle residual force enhancement: a brief review
Muscle residual force enhancement has been observed in different muscle preparations for more than half a century. Nonetheless, its mechanism remains unclear; to date, there are three generally accepted hypotheses: 1) sarcomere length non-uniformity, 2) engagement of passive elements, and 3) an increased number of cross-bridges. The first hypothesis uses sarcomere non-homogeneity and instabilit...
متن کاملResidual force enhancement in myofibrils and sarcomeres.
Residual force enhancement has been observed following active stretch of skeletal muscles and single fibres. However, there has been intense debate whether force enhancement is a sarcomeric property, or is associated with sarcomere length instability and the associated development of non-uniformities. Here, we studied force enhancement for the first time in isolated myofibrils (n=18) that, owin...
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This study examined the influence of the elongation of attached crossbridges and residual force enhancement on joint torque enhancement by the stretch-shortening cycle (SSC). Electrically evoked submaximal tetanic plantar flexions were adopted. Concentric contractions were evoked in the following three conditions: after 2 s isometric preactivation (ISO condition), after 1 s isometric then 1 s e...
متن کاملResidual force depression is not abolished following a quick shortening step.
Residual force depression is long lasting, but can be abolished instantaneously when a muscle is deactivated just long enough for force to drop to zero. According to the "cross-bridge inhibition theory" of force depression, this result is predicted as the release of stress on actin during deactivation restores the angular distortion of the actin binding sites, thereby establishing conditions id...
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ژورنال
عنوان ژورنال: Medicine & Science in Sports & Exercise
سال: 2018
ISSN: 1530-0315,0195-9131
DOI: 10.1249/mss.0000000000001670