Neuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions

To determine the relationships between limiting factors and neuromuscular activity during a self-paced 20-km cycling time trial and evaluate the effect of environmental conditions on fatigue indices. Methods: Ten endurance-trained and heat-acclimated athletes performed in three conditions (ambient t...

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Autores principales:	Michelle Baillot, Olivier Hue, Trong Than Tran, Sophie Antoine-Jonville
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	thermoregulation heat loss hot/humid climate electromyogram aerobic exercise Science Q
Acceso en línea:	https://doaj.org/article/cd86e5aa8dce496c9ee83e6edc8fd1e7
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id	oai:doaj.org-article:cd86e5aa8dce496c9ee83e6edc8fd1e7
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spelling	oai:doaj.org-article:cd86e5aa8dce496c9ee83e6edc8fd1e72021-11-25T18:10:41ZNeuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions10.3390/life111111492075-1729https://doaj.org/article/cd86e5aa8dce496c9ee83e6edc8fd1e72021-10-01T00:00:00Zhttps://www.mdpi.com/2075-1729/11/11/1149https://doaj.org/toc/2075-1729To determine the relationships between limiting factors and neuromuscular activity during a self-paced 20-km cycling time trial and evaluate the effect of environmental conditions on fatigue indices. Methods: Ten endurance-trained and heat-acclimated athletes performed in three conditions (ambient temperature, relative humidity): HUMID (30 °C, 90%), DRY (35 °C, 46%) and NEUTRAL (22 °C, 55%). Voluntary muscular contractions and electromagnetic stimulations were recorded before and after the time trials to assess fatigue. The data on performance, temperature, heat storage, electromyogram, heart rate and rating of perceived exertion data were analyzed. Results: Performance was impaired in DRY and HUMID compared with NEUTRAL environment (<i>p</i> < 0.05). The force developed by the vastus lateral muscle during stimulation of the femoral nerve remained unchanged across conditions. The percentage of integrated electromyogram activity, normalized by the value attained during the pre-trial maximal voluntary contraction, decreased significantly throughout the trial only in HUMID condition (<i>p</i> < 0.01). Neuromuscular activity in peripheral skeletal muscle started to fall from the 11th km in HUMID and the 15th km in DRY condition, although core temperature did not reach critical values. Conclusions: These alterations suggest that afferences from core/skin temperature regulate the central neural motor drive, reducing the active muscle recruited during prolonged exercise in the heat in order to prevent the system from hyperthermia.Michelle BaillotOlivier HueTrong Than TranSophie Antoine-JonvilleMDPI AGarticlethermoregulationheat losshot/humid climateelectromyogramaerobic exerciseScienceQENLife, Vol 11, Iss 1149, p 1149 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermoregulation heat loss hot/humid climate electromyogram aerobic exercise Science Q
spellingShingle	thermoregulation heat loss hot/humid climate electromyogram aerobic exercise Science Q Michelle Baillot Olivier Hue Trong Than Tran Sophie Antoine-Jonville Neuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions
description	To determine the relationships between limiting factors and neuromuscular activity during a self-paced 20-km cycling time trial and evaluate the effect of environmental conditions on fatigue indices. Methods: Ten endurance-trained and heat-acclimated athletes performed in three conditions (ambient temperature, relative humidity): HUMID (30 °C, 90%), DRY (35 °C, 46%) and NEUTRAL (22 °C, 55%). Voluntary muscular contractions and electromagnetic stimulations were recorded before and after the time trials to assess fatigue. The data on performance, temperature, heat storage, electromyogram, heart rate and rating of perceived exertion data were analyzed. Results: Performance was impaired in DRY and HUMID compared with NEUTRAL environment (<i>p</i> < 0.05). The force developed by the vastus lateral muscle during stimulation of the femoral nerve remained unchanged across conditions. The percentage of integrated electromyogram activity, normalized by the value attained during the pre-trial maximal voluntary contraction, decreased significantly throughout the trial only in HUMID condition (<i>p</i> < 0.01). Neuromuscular activity in peripheral skeletal muscle started to fall from the 11th km in HUMID and the 15th km in DRY condition, although core temperature did not reach critical values. Conclusions: These alterations suggest that afferences from core/skin temperature regulate the central neural motor drive, reducing the active muscle recruited during prolonged exercise in the heat in order to prevent the system from hyperthermia.
format	article
author	Michelle Baillot Olivier Hue Trong Than Tran Sophie Antoine-Jonville
author_facet	Michelle Baillot Olivier Hue Trong Than Tran Sophie Antoine-Jonville
author_sort	Michelle Baillot
title	Neuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions
title_short	Neuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions
title_full	Neuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions
title_fullStr	Neuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions
title_full_unstemmed	Neuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions
title_sort	neuromuscular activity during cycling performance in hot/dry and hot/humid conditions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/cd86e5aa8dce496c9ee83e6edc8fd1e7
work_keys_str_mv	AT michellebaillot neuromuscularactivityduringcyclingperformanceinhotdryandhothumidconditions AT olivierhue neuromuscularactivityduringcyclingperformanceinhotdryandhothumidconditions AT trongthantran neuromuscularactivityduringcyclingperformanceinhotdryandhothumidconditions AT sophieantoinejonville neuromuscularactivityduringcyclingperformanceinhotdryandhothumidconditions
_version_	1718411525356519424

Neuromuscular Activity during Cycling Performance in Hot/Dry and Hot/Humid Conditions

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