Abstract
Objectives
This study aimed at proposing a new heart rate (HR) method to track aerobic metabolism
in soccer by: (i) validating a recently developed HR index (HRindex) in professional soccer players, (ii) comparing HRindex vs the most common HR parameters and (iii) testing the agreement between measured
and estimated VO2 values using HRindex.
Design
cross-sectional.
Methods
184 professional soccer players performed a step incremental running test on a treadmill
while VO2 and HR were recorded. HRindex was calculated (actual HR/resting HR) and its relationship with VO2 was compared with the relationships with the metabolism of actual HR, net HR, and
% of HR reserve. Finally, HRindex was used to predict VO2 = ((HRindex · 6) − 5) · 3.5) and measured and estimated VO2 were compared by 2W RM-ANOVA and Bland–Altman analysis.
Results
HRindex/VO2 relationship explained 85% of the variability in data, showing a higher performance
than actual HR (77%) and similar values to the other parameters. Measured and estimated
VO2 were not significantly different ≤14 km h−1, whereas at speeds ≥14 km h−1 measured VO2 was higher than estimated VO2. Finally, measured and estimated VO2 were highly correlated (R2 = 0.85, p = 0.000), and showed no significant bias (bias = −1.03, z = −0.69, precision = 3.75 ml kg min−1).
Conclusions
We validated the HRindex/VO2 relationship in professional soccer players. HRindex showed better agreement with metabolism than actual HR and similar agreement to the
other HR parameters. HRindex allowed to estimate VO2, but at very high-intensity HRindex underestimated VO2. Future studies should test this in real game conditions. HRindex could offer a time-efficient and easy-to-use “field” method to monitor aerobic metabolism
in soccer.
Keywords
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Article info
Publication history
Published online: April 26, 2020
Accepted:
April 17,
2020
Received in revised form:
April 13,
2020
Received:
December 10,
2019
Identification
Copyright
© 2020 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
