Residual Force Enhancement Is Preserved for Conditions of Reduced Contractile Force
نویسندگان
چکیده
منابع مشابه
Residual force enhancement exceeds the isometric force at optimal sarcomere length for optimized stretch conditions.
Residual force enhancement (FE) following stretch of an activated muscle is a well accepted property of skeletal muscle contraction. However, the mechanism underlying FE remains unknown. A crucial assumption on which some proposed mechanisms are based is the idea that forces in the enhanced state cannot exceed the steady-state isometric force at a sarcomere length associated with optimal myofil...
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...
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 کاملCalcium sensitivity of residual force enhancement in rabbit skinned fibers.
Isometric force after active stretch of muscles is higher than the purely isometric force at the corresponding length. This property is termed residual force enhancement. Active force in skeletal muscle depends on calcium attachment characteristics to the regulatory proteins. Passive force has been shown to influence calcium attachment characteristics, specifically the sarcomere length dependen...
متن کاملResidual Force Enhancement in Context of Everyday Human Movement
When an active muscle is stretched, the resulting posteccentric steady-state force is known to be greater than the isometric force at the corresponding muscle length. The aim of our research was to clarify if residual force enhancement (RFE) is relevant for voluntary human muscle action in everyday like scenarios. Therefore 13 healthy subjects participated in our study and had to perform bilate...
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ژورنال
عنوان ژورنال: Medicine & Science in Sports & Exercise
سال: 2018
ISSN: 1530-0315,0195-9131
DOI: 10.1249/mss.0000000000001563