AUTHOR=Silva Henrique Santos da , Nakamura Fabio Yuzo , Papoti Marcelo , da Silva Alexsandro Santos , Dos-Santos Julio Wilson 

TITLE=Relationship Between Heart Rate, Oxygen Consumption, and Energy Expenditure in Futsal

JOURNAL=Frontiers in Psychology

VOLUME=12

YEAR=2021

URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2021.698622

DOI=10.3389/fpsyg.2021.698622

ISSN=1664-1078

ABSTRACT=<p>The primary aim of this study was to compare the measured oxygen consumption (Measured<italic>-V</italic>O<sub>2</sub>) in a simulated futsal game (S-Game) with the estimated oxygen consumption (Estimated<italic>-V</italic>O<sub>2</sub>) through a regression equation between heart rate (HR) and oxygen consumption (<italic>V</italic>O<sub>2</sub>) (HR-<italic>V</italic>O<sub>2</sub>) in treadmill running, and a secondary aim was to calculate the total energy expenditure (EE) in S-Game. Ten professional players (22.20 ± 3.22 years) were evaluated. HR-<italic>V</italic>O<sub>2</sub> was determined individually in the continuous test on the treadmill (Cont<sub>Test</sub>). The Measured<italic>-V</italic>O<sub>2</sub> in S-Game was compared with the Estimated<italic>-V</italic>O<sub>2</sub> in the Cont<sub>Test</sub>. Alactic and lactic pathways were estimated by <italic>V</italic>O<sub>2</sub>. The Estimated<italic>-V</italic>O<sub>2</sub> presented no statistically significant difference with the Measured<italic>-V</italic>O<sub>2</sub>, using the paired <italic>t</italic>-test (<italic>p</italic> = 0.38). However, the correlation between Estimated- and Measured-<italic>V</italic>O<sub>2</sub> was very weak (<italic>r</italic> = −0.05), and it presented poor agreement (concordance correlation coefficient = −0.04). In addition, a Bland–Altman plot presented bias of −2.8 ml/kg/min and individual difference as large as 19 ml/kg/min. The HR-<italic>V</italic>O<sub>2</sub> determined by the Cont<sub>Test</sub> was not a good individual predictor of <italic>V</italic>O<sub>2</sub>. The high intensity and intermittent nature of the futsal game possibly caused dissociation in the HR-<italic>V</italic>O<sub>2</sub> relationship. Cont<sub>Test</sub> is not recommended for estimating <italic>V</italic>O<sub>2</sub> and calculating individual EE in the futsal game. This is recommended only for the group mean. The total EE in S-Game was 13.10 ± 1.25 kcal.min<sup>−1</sup> (10.81 ± 1.57 metabolic equivalents). The contributions from the metabolic pathways were as follows: aerobic (93%), alactic (5%), and lactic (2%).</p>