Don Sheriff , Philip S . Clifford , Jason J . Hamann , Zoran Valic and John B . during locomotion Point : The muscle pump raises muscle blood flow
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Muscle pump does not enhance blood flow in exercising skeletal muscle.
The muscle pump theory holds that contraction aids muscle perfusion by emptying the venous circulation, which lowers venous pressure during relaxation and increases the pressure gradient across the muscle. We reasoned that the influence of a reduction in venous pressure could be determined after maximal pharmacological vasodilation, in which the changes in vascular tone would be minimized. Mong...
متن کاملMuscle blood flow response to contraction: influence of venous pressure.
The skeletal muscle pump is thought to be at least partially responsible for the immediate muscle hyperemia seen with exercise. We hypothesized that increases in venous pressure within the muscle would enhance the effectiveness of the muscle pump and yield greater postcontraction hyperemia. In nine anesthetized beagle dogs, arterial inflow and venous outflow of a single hindlimb were measured w...
متن کاملSympathetic restraint of muscle blood flow at the onset of dynamic exercise.
Little attention has focused on sympathetic influences on skeletal muscle blood flow at the onset of exercise. We hypothesized that 1) the sympathetic nervous system constrains muscle blood flow and 2) the decline from peak blood flow is mediated by increasing sympathetic vasoconstrictor tone. Mongrel dogs (n = 7) ran on a treadmill after intra-arterial infusion of saline (control) or combined ...
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Naik, Jay S., Zoran Valic, John B. Buckwalter, and Philip S. Clifford. Rapid vasodilation in response to a brief tetanic muscle contraction. J. Appl. Physiol. 87(5): 1741–1746, 1999.—To test the hypothesis that vasodilation occurs because of the release of a vasoactive substance after a brief muscle contraction and to determine whether acetylcholine spillover from the motor nerve is involved in...
متن کاملExercise attenuates a-adrenergic-receptor responsiveness in skeletal muscle vasculature
Buckwalter, John B., Jay S. Naik, Zoran Valic, and Philip S. Clifford. Exercise attenuates a-adrenergic-receptor responsiveness in skeletal muscle vasculature. J Appl Physiol 90: 172–178, 2001.—Attenuation of sympathetic vasoconstriction (sympatholysis) in working muscles during dynamic exercise is controversial. A potential mechanism is a reduction in a-adrenergic-receptor responsiveness. The ...
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