Key result
Reflex sympathetic activation decreases muscle oxygenation in resting skeletal muscle, but this effect is abolished when the muscle is exercised at an intensity of 10% or greater of maximal voluntary contraction.
Why the study?
Does reflex-sympathetic activation decrease muscle oxygenation in resting and exercising human skeletal muscle?
Does reflex-sympathetic activation decrease muscle oxygenation in resting and exercising human skeletal muscle?
Sympathetic neural control of skeletal muscle oxygenation is sensitive to modulation by metabolic events in contracting muscles, which abolish reflex-sympathetic deoxygenation during exercise >10% MVC.
No takes yet. Share an insight, caveat, or question.
Should not yet alter exercise guidance in sympathetic disorders; leaves open sympathetic contributions to muscle fatigue.
Hansen et al. (1996) studied Healthy volunteers (n=29). Rhythmic handgrip exercise and lower body negative pressure (LBNP) vs. Resting muscle was evaluated on Change in muscle oxygenation (tissue oxygen stores and mitochondrial cytochrome a,a3 redox state). Reflex sympathetic activation decreases muscle oxygenation in resting skeletal muscle, but this effect is abolished when the muscle is exercised at an intensity of 10% or greater of maximal voluntary contraction.
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