Aerobic training for 20 weeks significantly altered the %HRR-%VO2R relationship, changing individual linear regression intercepts from 8.9 to 13.1 and slopes from 0.971 to 0.891 (p<0.001).
Observational (n=450)
Does 20 weeks of aerobic training alter the relationship between heart rate reserve and oxygen uptake reserve in healthy sedentary individuals?
The %HRR-%VO2R relationship differs from the 1:1 identity line and exhibits high interindividual variability that increases with aerobic training, suggesting a single equation is not suitable for all individuals.
p-value: p=< 0.001
ABSTRACT This study aimed to assess if, during incremental exercise, considering individual characteristics can make the relationship between the percentages of heart rate (HRR) and oxygen uptake ( V̇ O 2 R) reserve either 1:1 or more accurate. Cycle ergometer data of the maximal incremental exercise tests performed by 450 healthy and sedentary participants (17–66 years) of the HERITAGE Family Study, grouped for sex, ethnicity, age, body fat, resting HR, and V̇ O 2max , were used to calculate the individual linear regressions between %HRR and % V̇ O 2 R. The mean slope and intercept of the individual linear regressions of each subgroup were compared with 1 and 0 (identity line), respectively, using Hotelling tests followed by post‐hoc one‐sample t ‐tests. Two multiple linear regressions were also performed, using either the slopes or intercepts of the individual linear regressions as dependent variables and sex, age, resting HR, and V̇ O 2max as independent variables. The mean %HRR‐% V̇ O 2 R relationships of all subgroups differed from the identity line. Moreover, individual linear regression intercepts (8.9 ± 16.0) and slopes (0.971 ± 0.190) changed ( p < 0.001) after 20 weeks of aerobic training (13.1 ± 11.1 and 0.891 ± 0.122). The multiple linear regressions could explain only 3.8% and 1.3% of the variance in the intercepts and slopes, whose variability remained high (standard error of estimate of 15.8 and 0.189). In conclusion, the %HRR‐% V̇ O 2 R relationship differs from the identity line regardless of individual characteristics and their difference increased after aerobic training. Moreover, due to the high interindividual variability, using a single equation for the whole population seems not suitable for representing the %HRR‐% V̇ O 2 R relationship of a given subject, even when several individual characteristics are considered.
Marini et al. (Fri,) conducted a observational in Healthy and sedentary (n=450). Aerobic training vs. Baseline was evaluated on Individual linear regression intercepts and slopes between %HRR and %VO2R (p=< 0.001). Aerobic training for 20 weeks significantly altered the %HRR-%VO2R relationship, changing individual linear regression intercepts from 8.9 to 13.1 and slopes from 0.971 to 0.891 (p<0.001).
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