An exercise is a form of stress, and like most stresses, is accompanied by sympathetic overactivity.
Skeletal muscles have both sympathetic noradrenergic vasoconstrictor fibers and sympathetic cholinergic vasodilator fibers.
Vasoconstrictor nerve fibers act mainly on veins. Venoconstriction improves venous return and helps in improving cardiac output.
On the other hand, sympathetic cholinergic fibers, which are unique to skeletal muscles, bring about arteriolar dilatation and thereby increase muscle blood flow.
An exercise is a form of stress, and like most stresses, is accompanied by sympathetic overactivity.
Skeletal muscles have both sympathetic noradrenergic vasoconstrictor fibers and sympathetic cholinergic vasodilator fibers.
Vasoconstrictor nerve fibers act mainly on veins. Venoconstriction improves venous return and helps in improving cardiac output.
On the other hand, sympathetic cholinergic fibers, which are unique to skeletal muscles, bring about arteriolar dilatation and thereby increase muscle blood flow.
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