The Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults

Fatigue is a key factor that affects human motion and modulates physiology, biochemistry, and performance. Prolonged cyclic human movements (locomotion primarily) are characterized by a regular pattern, and this extended activity can induce fatigue. However, the relationship between fatigue and regu...

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Autores principales:	Marco Rabuffetti, Mathias Steinach, Julia Lichti, Hanns-Christian Gunga, Björn Balcerek, Philipp Nils Becker, Michael Fähling, Giampiero Merati, Martina Anna Maggioni
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	healthy subjects locomotion regularity fatigue Bruce test training Biotechnology TP248.13-248.65
Acceso en línea:	https://doaj.org/article/48f6e0e3722c44fbb5addae85d6ddf1f
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spelling	oai:doaj.org-article:48f6e0e3722c44fbb5addae85d6ddf1f2021-11-30T19:11:37ZThe Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults2296-418510.3389/fbioe.2021.724791https://doaj.org/article/48f6e0e3722c44fbb5addae85d6ddf1f2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fbioe.2021.724791/fullhttps://doaj.org/toc/2296-4185Fatigue is a key factor that affects human motion and modulates physiology, biochemistry, and performance. Prolonged cyclic human movements (locomotion primarily) are characterized by a regular pattern, and this extended activity can induce fatigue. However, the relationship between fatigue and regularity has not yet been extensively studied. Wearable sensor methodologies can be used to monitor regularity during standardized treadmill tests (e.g., the widely used Bruce test) and to verify the effects of fatigue on locomotion regularity. Our study on 50 healthy adults [27 males and 23 females; <40 years; five dropouts; and 22 trained (T) and 23 untrained (U) subjects] showed how locomotion regularity follows a parabolic profile during the incremental test, without exception. At the beginning of the trial, increased walking speed in the absence of fatigue is associated with increased regularity (regularity index, RI, a. u., null/unity value for aperiodic/periodic patterns) up until a peak value (RI = 0.909 after 13.8 min for T and RI = 0.915 after 13.4 min for U subjects; median values, n. s.) and which is then generally followed (after 2.8 and 2.5 min, respectively, for T/U, n. s.) by the walk-to-run transition (at 12.1 min for both T and U, n. s.). Regularity then decreases with increased speed/slope/fatigue. The effect of being trained was associated with significantly higher initial regularity [0.845 (T) vs 0.810 (U), p < 0.05 corrected], longer test endurance [23.0 min (T) vs 18.6 min (U)], and prolonged decay of locomotor regularity [8.6 min (T) vs 6.5 min (U)]. In conclusion, the monitoring of locomotion regularity can be applied to the Bruce test, resulting in a consistent time profile. There is evidence of a progressive decrease in regularity following the walk-to-run transition, and these features unveil significant differences among healthy trained and untrained adult subjects.Marco RabuffettiMathias SteinachJulia LichtiJulia LichtiHanns-Christian GungaBjörn BalcerekPhilipp Nils BeckerMichael FählingGiampiero MeratiGiampiero MeratiMartina Anna MaggioniMartina Anna MaggioniFrontiers Media S.A.articlehealthy subjectslocomotionregularityfatigueBruce testtrainingBiotechnologyTP248.13-248.65ENFrontiers in Bioengineering and Biotechnology, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	healthy subjects locomotion regularity fatigue Bruce test training Biotechnology TP248.13-248.65
spellingShingle	healthy subjects locomotion regularity fatigue Bruce test training Biotechnology TP248.13-248.65 Marco Rabuffetti Mathias Steinach Julia Lichti Julia Lichti Hanns-Christian Gunga Björn Balcerek Philipp Nils Becker Michael Fähling Giampiero Merati Giampiero Merati Martina Anna Maggioni Martina Anna Maggioni The Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults
description	Fatigue is a key factor that affects human motion and modulates physiology, biochemistry, and performance. Prolonged cyclic human movements (locomotion primarily) are characterized by a regular pattern, and this extended activity can induce fatigue. However, the relationship between fatigue and regularity has not yet been extensively studied. Wearable sensor methodologies can be used to monitor regularity during standardized treadmill tests (e.g., the widely used Bruce test) and to verify the effects of fatigue on locomotion regularity. Our study on 50 healthy adults [27 males and 23 females; <40 years; five dropouts; and 22 trained (T) and 23 untrained (U) subjects] showed how locomotion regularity follows a parabolic profile during the incremental test, without exception. At the beginning of the trial, increased walking speed in the absence of fatigue is associated with increased regularity (regularity index, RI, a. u., null/unity value for aperiodic/periodic patterns) up until a peak value (RI = 0.909 after 13.8 min for T and RI = 0.915 after 13.4 min for U subjects; median values, n. s.) and which is then generally followed (after 2.8 and 2.5 min, respectively, for T/U, n. s.) by the walk-to-run transition (at 12.1 min for both T and U, n. s.). Regularity then decreases with increased speed/slope/fatigue. The effect of being trained was associated with significantly higher initial regularity [0.845 (T) vs 0.810 (U), p < 0.05 corrected], longer test endurance [23.0 min (T) vs 18.6 min (U)], and prolonged decay of locomotor regularity [8.6 min (T) vs 6.5 min (U)]. In conclusion, the monitoring of locomotion regularity can be applied to the Bruce test, resulting in a consistent time profile. There is evidence of a progressive decrease in regularity following the walk-to-run transition, and these features unveil significant differences among healthy trained and untrained adult subjects.
format	article
author	Marco Rabuffetti Mathias Steinach Julia Lichti Julia Lichti Hanns-Christian Gunga Björn Balcerek Philipp Nils Becker Michael Fähling Giampiero Merati Giampiero Merati Martina Anna Maggioni Martina Anna Maggioni
author_facet	Marco Rabuffetti Mathias Steinach Julia Lichti Julia Lichti Hanns-Christian Gunga Björn Balcerek Philipp Nils Becker Michael Fähling Giampiero Merati Giampiero Merati Martina Anna Maggioni Martina Anna Maggioni
author_sort	Marco Rabuffetti
title	The Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults
title_short	The Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults
title_full	The Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults
title_fullStr	The Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults
title_full_unstemmed	The Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults
title_sort	association of fatigue with decreasing regularity of locomotion during an incremental test in trained and untrained healthy adults
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/48f6e0e3722c44fbb5addae85d6ddf1f
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The Association of Fatigue With Decreasing Regularity of Locomotion During an Incremental Test in Trained and Untrained Healthy Adults

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