Key result
During moderate-intensity exercise, the kinetics of local muscle deoxygenation (time constant 10 ± 3 s) were significantly faster than phase 2 pulmonary O2 uptake (30 ± 8 s, P<0.01).
Population
11 young adults (5 men, 6 women; mean age 23 +/- 3 yr)
Design
Other
Authors
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May refine models of O2 utilization during moderate exercise; leaves open extension to clinical populations.
Absolute Event Rate: 30% vs 10%
p-value: p=<0.01
During moderate-intensity exercise, local muscle deoxygenation kinetics are faster than phase 2 pulmonary O2 uptake kinetics, indicating a mismatch between local muscle O2 consumption and perfusion.
DeLorey et al. (2003) studied this question. Moderate-intensity leg-cycling exercise was evaluated on Time constant for pulmonary O2 uptake (Vo2p) vs muscle deoxygenation (HHb) (p=<0.01). During moderate-intensity exercise, the kinetics of local muscle deoxygenation (time constant 10 ± 3 s) were significantly faster than phase 2 pulmonary O2 uptake (30 ± 8 s, P<0.01).
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