Predicting max HR and the HR-&OV0312;2 relationship for exercise prescription in obesity

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Abstract
Ationship between relative oxygen consumption (V̇2) and heart rate (HR) in obese (N = 86, body fat > 30%, hydrostatic weighing) compared with normal-weight (N = 51, body fat ≤ 30%) adults. Simultaneous measurements of HR and V̇2 were recorded at rest and every minute during a maximal graded exercise test. When MHR was regressed on age, two distinct equations for the obese and normalweights were generated. The relationship between %MHR and %max V̇2 was similar between groups (r = 0.83, obese; r = 0.87 normalweights). Likewise, when %max V̇2 was regressed on %max heart rate range similar equations were derived for the obese (r = 0.81) and normalweights (r = 0.84). Correlation between Karvonen's predicted HR at a submaximal V̇2 and the true HR at that V̇2 was 0.88, regardless of adiposity. These data indicate that when predicting MHR in normal-weights the equation 220-Age can be used, but for obese individuals the equation 200 - 0.5 × Age is more accurate; each having 12 as a standard error of estimate. Once MHR is determined, either the straight percentage technique or Karvonen's method would be appropriate for prescribing exercise intensity for both populations. ©1993The American College of Sports Medicine...

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