Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls

The impact of endurance training on spinal neural circuitries remains largely unknown. Some studies have reported higher H-reflexes in endurance trained athletes and therefore, adaptations within the Ia afferent pathways after long term endurance training have been suggested. In the present study we...

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Autores principales:	Raphael Bertschinger, Louis-Solal Giboin, Markus Gruber
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	H-reflex recruitment curve spinal plasticity sigmoidal fit endurance athletes cycling Physiology QP1-981
Acceso en línea:	https://doaj.org/article/262eb5139b46435891ddd49503150b33
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spelling	oai:doaj.org-article:262eb5139b46435891ddd49503150b332021-11-12T06:11:05ZEndurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls1664-042X10.3389/fphys.2021.736067https://doaj.org/article/262eb5139b46435891ddd49503150b332021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fphys.2021.736067/fullhttps://doaj.org/toc/1664-042XThe impact of endurance training on spinal neural circuitries remains largely unknown. Some studies have reported higher H-reflexes in endurance trained athletes and therefore, adaptations within the Ia afferent pathways after long term endurance training have been suggested. In the present study we tested the hypothesis that cyclists (n = 12) demonstrate higher Hoffmann reflexes (H-reflexes) compared to recreationally active controls (n = 10). Notwithstanding, highly significant differences in endurance performance (VO2peak: 60.6 for cyclists vs. 46.3 ml/min/kg for controls (p < 0.001) there was no difference in the size of the SOL H-reflex between cyclists and controls (Hmax/Mmax ratio 61.3 vs. 60.0%, respectively (p = 0.840). Further analyses of the H and M recruitment curves for SOL revealed a significant steeper slope of the M recruitment curve in the group of cyclists (76.2 ± 3.8° vs. 72.0 ± 4.4°, p = 0.046) without a difference in the H-recruitment curve (84.6 ± 3.0° vs. 85.0 ± 2.8°, p = 0.784) compared to the control group. Cycling is classified as an endurance sport and thus the findings of the present study do not further support the assumption that long-term aerobic training leads to a general increase of the H-reflex. Amongst methodological differences in assessing the H-reflex, the training-specific sensorimotor control of the endurance sport itself might differently affect the responsiveness of spinal motoneurons on Ia-afferent inputs.Raphael BertschingerLouis-Solal GiboinMarkus GruberFrontiers Media S.A.articleH-reflexrecruitment curvespinal plasticitysigmoidal fitendurance athletescyclingPhysiologyQP1-981ENFrontiers in Physiology, Vol 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	H-reflex recruitment curve spinal plasticity sigmoidal fit endurance athletes cycling Physiology QP1-981
spellingShingle	H-reflex recruitment curve spinal plasticity sigmoidal fit endurance athletes cycling Physiology QP1-981 Raphael Bertschinger Louis-Solal Giboin Markus Gruber Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls
description	The impact of endurance training on spinal neural circuitries remains largely unknown. Some studies have reported higher H-reflexes in endurance trained athletes and therefore, adaptations within the Ia afferent pathways after long term endurance training have been suggested. In the present study we tested the hypothesis that cyclists (n = 12) demonstrate higher Hoffmann reflexes (H-reflexes) compared to recreationally active controls (n = 10). Notwithstanding, highly significant differences in endurance performance (VO2peak: 60.6 for cyclists vs. 46.3 ml/min/kg for controls (p < 0.001) there was no difference in the size of the SOL H-reflex between cyclists and controls (Hmax/Mmax ratio 61.3 vs. 60.0%, respectively (p = 0.840). Further analyses of the H and M recruitment curves for SOL revealed a significant steeper slope of the M recruitment curve in the group of cyclists (76.2 ± 3.8° vs. 72.0 ± 4.4°, p = 0.046) without a difference in the H-recruitment curve (84.6 ± 3.0° vs. 85.0 ± 2.8°, p = 0.784) compared to the control group. Cycling is classified as an endurance sport and thus the findings of the present study do not further support the assumption that long-term aerobic training leads to a general increase of the H-reflex. Amongst methodological differences in assessing the H-reflex, the training-specific sensorimotor control of the endurance sport itself might differently affect the responsiveness of spinal motoneurons on Ia-afferent inputs.
format	article
author	Raphael Bertschinger Louis-Solal Giboin Markus Gruber
author_facet	Raphael Bertschinger Louis-Solal Giboin Markus Gruber
author_sort	Raphael Bertschinger
title	Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls
title_short	Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls
title_full	Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls
title_fullStr	Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls
title_full_unstemmed	Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls
title_sort	endurance trained athletes do not per se have higher hoffmann reflexes than recreationally active controls
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/262eb5139b46435891ddd49503150b33
work_keys_str_mv	AT raphaelbertschinger endurancetrainedathletesdonotpersehavehigherhoffmannreflexesthanrecreationallyactivecontrols AT louissolalgiboin endurancetrainedathletesdonotpersehavehigherhoffmannreflexesthanrecreationallyactivecontrols AT markusgruber endurancetrainedathletesdonotpersehavehigherhoffmannreflexesthanrecreationallyactivecontrols
_version_	1718431159273127936

Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls

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