HRR and VËO2R Fractions Are Not Equivalent: Is It Time to Rethink Aerobic Exercise Prescription Methods?
Med Sci Sports Exerc
; 53(1): 174-182, 2021 01.
Article
em En
| MEDLINE
| ID: mdl-32694364
ABSTRACT
INTRODUCTION:
According to current guidelines, the intensity of health-enhancing aerobic exercise should be prescribed using a percentage of heart rate reserve (%HRR), which is considered to be more closely associated (showing a 11 relation) with the percentage of oxygen uptake reserve (%VËO2R) rather than with the percentage of maximal oxygen uptake (%VËO2max) during incremental exercise. However, the associations between %HRR and %VËO2R and between %HRR and %VËO2max are under debate; hence, their actual relationships were investigated in this study.METHODS:
Data from each stage of a maximal incremental exercise test performed by 737 healthy and physically inactive participants of the HERITAGE Family Study were screened and filtered then used to calculate the individual linear regressions between %HRR and either %VËO2R or %VËO2max. For each relationship, the mean slope and intercept of the individual linear regression were compared with 1 and 0 (i.e., the identity line), respectively, using one-sample t-tests. The individual root mean square errors of the actual versus the 11 predicted %HRR were calculated for both relationships and compared using a paired-sample t-test.RESULTS:
The mean slopes (%HRR-%VËO2R, 0.972 ± 0.189; %HRR-%VËO2max, 1.096 ± 0.216) and intercepts (%HRR-%VËO2R, 8.855 ± 16.022; %HRR-%VËO2max, -3.616 ± 18.993) of both relationships were significantly different from 1 and 0, respectively, with high interindividual variability. The average root mean square errors were high and revealed that the %HRR-%VËO2max relationship was more similar to the identity line (P < 0.001) than the %HRR-%VËO2R relationship (7.78% ± 4.49% vs 9.25% ± 5.54%).CONCLUSIONS:
Because both relationships are different from the identity line and using a single equation may not be appropriate to predict exercise intensity at the individual level, a rethinking of the relationships between the intensity variables may be necessary to ensure that the most suitable health-enhancing aerobic exercise intensity is prescribed.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Consumo de Oxigênio
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Exercício Físico
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Frequência Cardíaca
Tipo de estudo:
Diagnostic_studies
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Prognostic_studies
Limite:
Adolescent
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Adult
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Aged
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Humans
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Middle aged
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article