Effect of steady-state aerobic exercise intensity and duration on the relationship between reserves of heart rate and oxygen uptake.
PeerJ
; 10: e13190, 2022.
Article
em En
| MEDLINE
| ID: mdl-35497191
ABSTRACT
Background:
The percentages of heart rate (%HRR) or oxygen uptake (%VÌO2R) reserve are used interchangeably for prescribing aerobic exercise intensity due to their assumed 11 relationship, although its validity is debated. This study aimed to assess if %HRR and %VÌO2R show a 11 relationship during steady-state exercise (SSE) and if exercise intensity and duration affect their relationship.Methods:
Eight physically active males (age 22.6 ± 1.2 years) were enrolled. Pre-exercise and maximal HR and VÌO2 were assessed on the first day. In the following 4 days, different SSEs were performed (running) combining the following randomly assigned durations and intensities 15 min, 45 min, 60% HRR, 80% HRR. Post-exercise maximal HR and VÌO2 were assessed after each SSE. Using pre-exercise and post-exercise maximal values, the average HR and VÌO2 of the last 5 min of each SSE were converted into percentages of the reserves (%RES), which were computed in a 3-way RM-ANOVA (α = 0.05) to assess if they were affected by the prescription parameter (HRR or VÌO2R), exercise intensity (60% or 80% HRR), and duration (15 or 45 min).Results:
The %RES values were not affected by the prescription parameter (p = 0.056) or its interactions with intensity (p = 0.319) or duration and intensity (p = 0.117), while parameter and duration interaction was significant (p = 0.009). %HRRs and %VÌO2Rs did not differ in the 15-min SSEs (mean difference [MD] = 0.7 percentage points, p = 0.717), whereas %HRR was higher than %VÌO2R in the 45-min SSEs (MD = 6.7 percentage points, p = 0.009).Conclusion:
SSE duration affects the %HRR-%VÌO2R relationship, with %HRRs higher than %VÌO2Rs in SSEs of longer duration.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Consumo de Oxigênio
/
Teste de Esforço
Limite:
Adult
/
Humans
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Male
Idioma:
En
Revista:
PeerJ
Ano de publicação:
2022
Tipo de documento:
Article