Comparison of physiological responses of running on a nonmotorized and conventional motor-propelled treadmill at similar intensities.
Sci Rep 2022;
12:11626. [PMID:
35804037 PMCID:
PMC9270331 DOI:
10.1038/s41598-022-13741-w]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Accepted: 05/27/2022] [Indexed: 11/22/2022] Open
Abstract
This study aimed to test the agreement of the incremental test's physiological responses between tethered running on a nonmotorized treadmill (NMT) to matched relative intensities while running on a conventional motorized treadmill (MT). Using a within-subject crossover design, nine male recreational runners (age = 22 ± 5 years; height = 175 ± 6 cm; weight = 68.0 ± 16.6 kg) underwent two test sessions: one was an incremental intensity protocol on an MT; the other was on an instrumented NMT. Intensity thresholds at \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\text V}}$$\end{document}V˙O2max, respiratory compensation point (iRCP), and lactate threshold (iLT) were registered for analysis, together with \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\text V}}$$\end{document}V˙˙O2, \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\text V}}$$\end{document}V˙˙E, ƒR, and blood lactate concentration ([Lac]). Comparisons were based on hypothesis testing (Student's T-test), effect sizes (Cohen's d), ICC, and Bland Altman analysis. Statistical significance was accepted at p < 0.05. Attained \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\text V}}$$\end{document}V˙O2max (MT = 52.2 ± 7.3 mL·kg-1·min-1 vs NMT = 50.1 ± 8.1 mL·kg-1·min-1) and \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\text V}}$$\end{document}V˙˙O2 at iRCP (MT = 46.3 ± 7.2 mL·kg-1·min-1 vs NMT = 42.8 ± 9.3 mL·kg-1·min-1) were not different between ergometers (p = 0.15 and 0.13, respectively), with significant ICCs (0.84 and 0.70, respectively) and Pearson’s correlations (r = 0.87 and 0.76, respectively). The [Lac] at iLT presented poor agreement between conditions. Significant correlations were found (r between 0.72 and 0.83) for relative power values of i\documentclass[12pt]{minimal}
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\begin{document}$${\dot{\text V}}$$\end{document}V˙O2max (6.56 ± 1.28 W·kg−1), iRCP (4.38 ± 1.50 W·kg−1), and iLT (4.15 ± 1.29 W·kg−1) related to their counterpart obtained on MT. Results show that running on an NMT offers a higher glycolytic demand under the same relative internal load as running on an MT but with a similar aerobic response and correlated intensity determination.
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