CONTRACTION BANDS AT SHORT SARCOMERE LENGTH IN CHICK MUSCLE

Contraction Bands at Short Sarcomere Length in Chick Muscle

Intraoperative single-site sarcomere length measurement accurately reflects whole-muscle sarcomere length in the rabbit.

PURPOSE To compare single-site intraoperative sarcomere length values with sarcomere lengths measured from systematic sampling of the entire transferred muscle. METHODS The tendon of the rabbit second toe extensor muscle was transposed to the ankle extensor retinaculum under levels of stretch over the sarcomere length range of about 2.5 microm to about 4.0 microm. Intraoperative sarcomere len...

In vivo myograph measurement of muscle contraction at optimal length

BACKGROUND Current devices for measuring muscle contraction in vivo have limited accuracy in establishing and re-establishing the optimum muscle length. They are variable in the reproducibility to determine the muscle contraction at this length, and often do not maintain precise conditions during the examination. Consequently, for clinical testing only semi-quantitative methods have been used. ...

Relation of muscle cell contraction and calcium distribution in sarcomere.

A model of activation of muscle contraction has been proposed. It is based on calcium diffusion and binding to specific regulatory sites in a sarcomere. Calcium ions activate interactions of contractile proteins and thus the generation of force. The model quantifies the relation between calcium released from intracellular stores and the elicited force.

The Sarcomere Length-Tension Relation in Skeletal Muscle

I N T R O D U C T I O N T e n s i o n d e v e l o p m e n t d u r i n g an i s o m e t r i c t e t a n u s in ske le ta l musc le occu r s in t h r e e d i s t inc t phases : t en s ion ini t ia l ly r ises r a p i d l y , t h e n c l imbs m o r e s lowly, a n d f ina l ly r e a c h e s a p l a t e a u which lasts m a n y s e c o n d s . T h i s t i m e c o u r s e is o b s e r v e d d u r i n ...