Ferri Marini et al. provide a thoughtful analysis of selected variables that may influence aerobic exercise prescription. The key consideration in our original Counterpoint article was to address the validity of the % heart rate (HR) reserve to % oxygen consumption (V̇o2) reserve relationship (%HRR-%V̇o2R). As previously noted, the American College of Sports Medicine (ACSM) adopted %HRR-%V̇o2R as the standard for prescribing cardiorespiratory exercise in its 1998 Position Stand (1).

Ferri Marini et al. argue that, although several subsequent studies have confirmed the 1:1 %HRR-%V̇o2R relationship, others have not. In our original Counterpoint article, we noted that the studies that did not support the relationship either reversed the axes in the regression—rendering a comparison invalid—or used different time frames for measuring HR versus V̇o2 that resulted in inflated HRs relative to...

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