relationships between range of motion, lo, and passive force….pdf

文档介绍：JOURNAL OF MORPHOLOGY 230:69-77 (1996) Relationships Between Range of Motion, Lo, and Passive Force in Five Strap-Like Muscles of the Feline Hind Limb IAN E. BROWN, TIINA L. LIINAMAA, AND GERALD E. LOEB MRC Group in Sensory-Motor Neuroscience and the Department of Physiology, Queen's Uniuersity, Kingston, Ontario, Canada K7L 3N6 ABSTRACT The relationships between range of motion, optimal length for force production (lo), and passive force provide useful insights into the struc- ture and function of muscles but are unknown for most individual muscles. We measured these values and examined their relationships in five strap-like muscles of the cat hind limb: caudofemoralis, semitendinosus, sartorius ante- rior, tenuissimus, and biceps femoris anterior. The range of motion relative to 1, was found to vary significantly between different muscles and even between different specimens of the same muscle. The passive force-length (FL) curve was found to be correlated with both 1, and l,, (maximal in situ muscle length) but was correlated more strongly with I,,. The mean passive force produced by these muscles at l,, was less than 7% of estimated maximal isometric force, suggesting that passive force may not be important in these