The influence of a hot environment on physiological stress responses in exercise until exhaustion
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1371/journal.pone.0209510 http://hdl.handle.net/11449/187323 |
Resumo: | Exhaustive exercise in a hot environment can impair performance. Higher epinephrine plasma levels occur during exercise in heat, indicating greater sympathetic activity. This study examined the influence of exercise in the heat on stress levels. Nine young healthy men performed a maximal progressive test on a cycle ergometer at two different environmental conditions: hot (40C) and normal (22C), both between 40% and 50% relative humidity. Venous blood and saliva samples were collected pre-test and post-test. Before exercise there were no significant changes in salivary biomarkers (salivary IgA: p = 0.12; α-amylase: p = 0.66; cortisol: p = 0.95; nitric oxide: p = 0.13; total proteins: p = 0.07) or blood lactate (p = 0.14) between the two thermal environments. Following exercise, there were significant increases in all variables (salivary IgA 22C: p = 0.04, 40C: p = 0.0002; α-amylase 22C: p = 0.0002, 40C: p = 0.0002; cortisol 22C: p = 0.02, 40C: p = 0.0002; nitric oxide 22C: p = 0.0005, 40C: p = 0.0003, total proteins 22C: p<0.0001, 40C: p<0.0001 and; blood lactate 22C: p<0.0001, 40C: p<0.0001) both at 22C and 40C. There was no significant adjustment regarding IgA levels between the two thermal environments (p = 0.74), however the levels of α-amylase (p = 0.02), cortisol (p<0.0001), nitric oxide (p = 0.02) and total proteins (p = 0.01) in saliva were higher in the hotter conditions. Blood lactate was lower under the hot environment (p = 0.01). In conclusion, enduring hot temperature intensified stressful responses elicited by exercise. This study advocates that hot temperature deteriorates exercise performance under exhaustive stress and effort conditions. |
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spelling |
The influence of a hot environment on physiological stress responses in exercise until exhaustionExhaustive exercise in a hot environment can impair performance. Higher epinephrine plasma levels occur during exercise in heat, indicating greater sympathetic activity. This study examined the influence of exercise in the heat on stress levels. Nine young healthy men performed a maximal progressive test on a cycle ergometer at two different environmental conditions: hot (40C) and normal (22C), both between 40% and 50% relative humidity. Venous blood and saliva samples were collected pre-test and post-test. Before exercise there were no significant changes in salivary biomarkers (salivary IgA: p = 0.12; α-amylase: p = 0.66; cortisol: p = 0.95; nitric oxide: p = 0.13; total proteins: p = 0.07) or blood lactate (p = 0.14) between the two thermal environments. Following exercise, there were significant increases in all variables (salivary IgA 22C: p = 0.04, 40C: p = 0.0002; α-amylase 22C: p = 0.0002, 40C: p = 0.0002; cortisol 22C: p = 0.02, 40C: p = 0.0002; nitric oxide 22C: p = 0.0005, 40C: p = 0.0003, total proteins 22C: p<0.0001, 40C: p<0.0001 and; blood lactate 22C: p<0.0001, 40C: p<0.0001) both at 22C and 40C. There was no significant adjustment regarding IgA levels between the two thermal environments (p = 0.74), however the levels of α-amylase (p = 0.02), cortisol (p<0.0001), nitric oxide (p = 0.02) and total proteins (p = 0.01) in saliva were higher in the hotter conditions. Blood lactate was lower under the hot environment (p = 0.01). In conclusion, enduring hot temperature intensified stressful responses elicited by exercise. This study advocates that hot temperature deteriorates exercise performance under exhaustive stress and effort conditions.Institute of Biotechnology Federal University of UberlandiaDepartment of Physiology and Morphology School of Medicine of ABCFederal University of AcrePost-Graduate Program in Physical Therapy UNESPCardiorespiratory Research Group Department of Biological and Medical Sciences Faculty of Health and Life Sciences Oxford Brookes University Headington CampusPost-Graduate Program in Physical Therapy UNESPUniversidade Federal de Uberlândia (UFU)School of Medicine of ABCFederal University of AcreUniversidade Estadual Paulista (Unesp)Headington CampusSilva, Romeu P.M.Barros, Cristiano L.M.Mendes, Thiago T.Garcia, Emerson S.Valenti, Vitor E. [UNESP]de Abreu, Luiz CarlosGarner, David M.Espindola, Foued SalmenPenha-Silva, Nilson2019-10-06T15:32:37Z2019-10-06T15:32:37Z2019-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1371/journal.pone.0209510PLoS ONE, v. 14, n. 2, 2019.1932-6203http://hdl.handle.net/11449/18732310.1371/journal.pone.02095102-s2.0-85061131692Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPLoS ONEinfo:eu-repo/semantics/openAccess2021-10-22T22:23:41Zoai:repositorio.unesp.br:11449/187323Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T22:23:41Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
The influence of a hot environment on physiological stress responses in exercise until exhaustion |
title |
The influence of a hot environment on physiological stress responses in exercise until exhaustion |
spellingShingle |
The influence of a hot environment on physiological stress responses in exercise until exhaustion Silva, Romeu P.M. |
title_short |
The influence of a hot environment on physiological stress responses in exercise until exhaustion |
title_full |
The influence of a hot environment on physiological stress responses in exercise until exhaustion |
title_fullStr |
The influence of a hot environment on physiological stress responses in exercise until exhaustion |
title_full_unstemmed |
The influence of a hot environment on physiological stress responses in exercise until exhaustion |
title_sort |
The influence of a hot environment on physiological stress responses in exercise until exhaustion |
author |
Silva, Romeu P.M. |
author_facet |
Silva, Romeu P.M. Barros, Cristiano L.M. Mendes, Thiago T. Garcia, Emerson S. Valenti, Vitor E. [UNESP] de Abreu, Luiz Carlos Garner, David M. Espindola, Foued Salmen Penha-Silva, Nilson |
author_role |
author |
author2 |
Barros, Cristiano L.M. Mendes, Thiago T. Garcia, Emerson S. Valenti, Vitor E. [UNESP] de Abreu, Luiz Carlos Garner, David M. Espindola, Foued Salmen Penha-Silva, Nilson |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Uberlândia (UFU) School of Medicine of ABC Federal University of Acre Universidade Estadual Paulista (Unesp) Headington Campus |
dc.contributor.author.fl_str_mv |
Silva, Romeu P.M. Barros, Cristiano L.M. Mendes, Thiago T. Garcia, Emerson S. Valenti, Vitor E. [UNESP] de Abreu, Luiz Carlos Garner, David M. Espindola, Foued Salmen Penha-Silva, Nilson |
description |
Exhaustive exercise in a hot environment can impair performance. Higher epinephrine plasma levels occur during exercise in heat, indicating greater sympathetic activity. This study examined the influence of exercise in the heat on stress levels. Nine young healthy men performed a maximal progressive test on a cycle ergometer at two different environmental conditions: hot (40C) and normal (22C), both between 40% and 50% relative humidity. Venous blood and saliva samples were collected pre-test and post-test. Before exercise there were no significant changes in salivary biomarkers (salivary IgA: p = 0.12; α-amylase: p = 0.66; cortisol: p = 0.95; nitric oxide: p = 0.13; total proteins: p = 0.07) or blood lactate (p = 0.14) between the two thermal environments. Following exercise, there were significant increases in all variables (salivary IgA 22C: p = 0.04, 40C: p = 0.0002; α-amylase 22C: p = 0.0002, 40C: p = 0.0002; cortisol 22C: p = 0.02, 40C: p = 0.0002; nitric oxide 22C: p = 0.0005, 40C: p = 0.0003, total proteins 22C: p<0.0001, 40C: p<0.0001 and; blood lactate 22C: p<0.0001, 40C: p<0.0001) both at 22C and 40C. There was no significant adjustment regarding IgA levels between the two thermal environments (p = 0.74), however the levels of α-amylase (p = 0.02), cortisol (p<0.0001), nitric oxide (p = 0.02) and total proteins (p = 0.01) in saliva were higher in the hotter conditions. Blood lactate was lower under the hot environment (p = 0.01). In conclusion, enduring hot temperature intensified stressful responses elicited by exercise. This study advocates that hot temperature deteriorates exercise performance under exhaustive stress and effort conditions. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:32:37Z 2019-10-06T15:32:37Z 2019-02-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1371/journal.pone.0209510 PLoS ONE, v. 14, n. 2, 2019. 1932-6203 http://hdl.handle.net/11449/187323 10.1371/journal.pone.0209510 2-s2.0-85061131692 |
url |
http://dx.doi.org/10.1371/journal.pone.0209510 http://hdl.handle.net/11449/187323 |
identifier_str_mv |
PLoS ONE, v. 14, n. 2, 2019. 1932-6203 10.1371/journal.pone.0209510 2-s2.0-85061131692 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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PLoS ONE |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1797789854727143424 |