Why the study?
It was unclear how transcapillary oxygen pressure gradients and interstitial oxygen pressures behave across diverse fibre types and oxidative capacities during the transition from rest to contractions.
Population
Rat skeletal muscles across slow- to fast-twitch and high- to low-oxidative spectrums
Comparison
Rest vs contractions (1 Hz, 120 s) across soleus, peroneal, mixed, and white gastrocnemius muscles
Design
Preclinical physiological study
Authors
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No immediate clinical changes to O2 delivery models; leaves open microvascular targets for exercise limitation in disease.
Colburn et al. (2020) studied this question.
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