[Role of compression of the vessels of the gastrocnemius muscle in changes in its blood supply during stretching].
In the m. gastrocnemius of anesthetized cats, the pressure of tissue resistance balancing was 5 mm Hg initially and developed a 7-fold increase in longitudinal stretch of the muscle by 10-20% when the total mechanical tension increased 20-fold (from 2400 to 47 662 H/m2) and the blood flow reduced from 5.0 to 3.0 ml . min-1 (100 r)-1. Decrease of the blood flow in stretching and the postelongation hyperemia could not be reproduced in external compression of the muscle equal to the balancing pressure at a given stretching. Only the external pressure 50 and 100 mm Hg decelerated the blood flow and developed a hyperemia even though a lesser one than the postelongation hyperemia. The effect of longitudinal muscle stretch on its vessels is not limited by their compression with the "intramuscular pressure".
D000818:Animals; D001696:Biomechanical Phenomena; D001808:Blood Vessels / Q000502:physiology; D002415:Cats; D006940:Hyperemia / Q000503:physiopathology; D009132:Muscles / Q000098:blood supply*; D010812:Physical Stimulation; D012039:Regional Blood Flow
Rol' sdavleniie sosudov ikronozhnoĭ myshtsy v izmeneniiakh ee krovosnabzheniia pri rastiazhenii.