Key result
%HRR aligns with %V˙O2max with ~16% less error than it does with %V˙O2R.
Why the study?
The associations between %HRR and %VO2R versus %HRR and %VO2max during incremental exercise remain under debate.
Does the relationship between %HRR and %V˙O2R or %V˙O2max follow a 1:1 identity line during incremental exercise in healthy inactive individuals?
Population
737 healthy and physically inactive participants of the HERITAGE Family Study
Comparison
%HRR vs %VO2R compared with %HRR vs %VO2max
Design
Cross-sectional analysis of exercise test data
Authors
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%HRR-%V˙O2max alignment closer to identity than %V˙O2R; leaves open optimal intensity prescription pending prospective trials in inactive adults.
Observational (n=737)
Does the relationship between %HRR and %V˙O2R or %V˙O2max follow a 1:1 identity line during incremental exercise in healthy inactive individuals?
Absolute Event Rate: 7.78% vs 9.25%
p-value: p=< 0.001
The relationship between %HRR and %V˙O2R or %V˙O2max is not 1:1, challenging current guidelines that use a single equation for aerobic exercise prescription.
Marini et al. (2020) conducted an observational in Healthy and physically inactive (n=737). Percentage of maximal oxygen uptake (%V˙O2max) vs. Percentage of oxygen uptake reserve (%V˙O2R) was evaluated on Root mean square error of actual versus 1:1 predicted %HRR (p=< 0.001). The relationship between %HRR and %V˙O2max was more similar to the identity line than the %HRR-%V˙O2R relationship (root mean square error 7.78% vs 9.25%; P<0.001).
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