Loss of twitch torque following muscle compression.
With the elbow flexed, compression of the human biceps brachii has been found to reduce twitch torque, with an approximately linear relationship being observed between the loss of torque and the applied pressure (up to 45 kPa). The decline in torque could no longer be demonstrated when the biceps muscle was stretched, by extending the elbow from a flexed position. The loss of torque in the flexed position appeared to be due to an inability of muscle sarcomeres to bulge sufficiently to take up the series elasticity at the fiber ends.
Brown
T
T
Department of Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada.
Galea
V
V
McComas
A
A
D000328:Adult; D004548:Elasticity; D004550:Elbow; D004558:Electric Stimulation; D004594:Electrophysiology; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D018763:Muscle Fatigue / Q000502:physiology*; D018485:Muscle Fibers, Skeletal / Q000502:physiology* / Q000648:ultrastructure; D018482:Muscle, Skeletal / Q000166:cytology / Q000502:physiology; D012518:Sarcomeres / Q000502:physiology; D019415:Torque