December 13, 2012AJP Regulatory Integrative and Comparative Physiology
Duration of “Phase I” V o 2p: a comparison of methods used in its estimation and the effects of varying moderate-intensity work rate
Key result
Varying moderate-intensity work rates (50 to 130 W) did not significantly affect Phase I pulmonary oxygen uptake duration (P>0.05), with poor agreement observed between estimation methods.
Population
14 males, mean age 24 ± 5 years
Comparison
Moderate-intensity exercise transitions from 20… vs Comparison across different work rates and…
Authors
Discussion
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Implication
Phase I VO2 duration stability across moderate work rates does not support protocol changes; leaves open estimation method reliability for validation.
Structured PICO
P
Population
14 males (mean age 24 years) completing moderate-intensity exercise transitions to evaluate Phase I pulmonary oxygen uptake duration.
I
Intervention
Moderate-intensity exercise transitions from 20 W to 50, 70, 90, 110, and 130 W (4-8 repetitions)
C
Comparator
Comparison across different work rates and between two estimation methods (visual inspection vs. biexponential nonlinear regression)
O
Outcome
Phase I pulmonary oxygen uptake (Vo2p) duration (P(I-Dur))surrogate
Main Result
p-value: p=>0.05
Absolute work rate does not affect Phase I pulmonary oxygen uptake duration during moderate-intensity exercise, but accepted estimation methods show poor agreement.
Limitations
- Poor agreement of P(I-Dur) estimates derived from two different, but accepted methods
- Relatively weak agreement among reviewers for individual estimation
Cite This Study
Spencer et al. (2012) studied this question. Varying moderate-intensity work rates vs. Different work rates was evaluated on Phase I Vo2p duration (p=>0.05). Varying moderate-intensity work rates (50 to 130 W) did not significantly affect Phase I pulmonary oxygen uptake duration (P>0.05), with poor agreement observed between estimation methods.