Key result
Steady-state plantar flexion exercise at 20% MVC blunted sympathetic vasoconstriction in gastrocnemius but not soleus muscles, whereas 40% MVC attenuated responses in both muscles.
Why the study?
Does sympathetic activation during exercise differentially affect tissue oxygenation in gastrocnemius versus soleus muscles in healthy males?
Population
12 healthy male subjects
Comparison
Sympathetic activation evoked by a cold pressor… vs Sympathetic activation evoked by a cold pressor…
Design
Other
Authors
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Does not yet alter exercise or sympathetic management; extends animal fiber-type observations to humans but remains hypothesis-generating.
Cross-Sectional (n=12)
Does sympathetic activation during exercise differentially affect tissue oxygenation in gastrocnemius versus soleus muscles in healthy males?
Skeletal muscles composed mainly of glycolytic type II fibres are more sensitive to functional sympatholysis at lower exercise intensities, and the blunting of sympathetic vasoconstriction is strongly related to metabolic demand.
Horiuchi et al. (2013) conducted a cross-sectional in Healthy (n=12). Steady-state plantar flexion exercise vs. Resting conditions was evaluated on Decrease in muscle oxygenation (HbO2) in response to sympathetic activation evoked by a cold pressor test. Steady-state plantar flexion exercise at 20% MVC blunted sympathetic vasoconstriction in gastrocnemius but not soleus muscles, whereas 40% MVC attenuated responses in both muscles.
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