Rehydration during exercise in the heat reduces physiological strain index in healthy adults
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng por |
Título da fonte: | Revista Brasileira de Cineantropometria & Desempenho Humano (Online) |
Texto Completo: | https://periodicos.ufsc.br/index.php/rbcdh/article/view/1980-0037.2014v16n6p629 |
Resumo: | Exercise in the heat leads to physiological alterations that reflect mainly on the cardiovascular system. The physiological strain index (PSI) uses heart rate (HR) and rectal temperature (Tre) to evaluate the cardiovascular strain and lately it has been brought up on the literature. However, few studies used the PSI to evaluate its response following dehydration and rehydration protocols. Thus, the aim of the present study was to verify the effect of rehydration proportional to fluid losses during prolonged exercise in the heat on hydration status, PSI and rating of perceived exertion (RPE) in healthy subjects. Ten volunteers performed two sessions of exercise in heat. The first with fluid restriction until subjects reach 2% of body mass (BM) reduction. The second with rehydration proportional to fluid losses of the first. HR and Tre were monitored during the entire exercise protocol in order to calculate PSI. Subjects also reported their RPE. BM, urine specific gravity (USG) and urine color (UC) were measured to evaluate hydration status. Results demonstrated greater PSI in the fluid restricted trial compared to the rehydration trial from 45 minutes of exercise (p<0,05), and that differences remain significant until the end of the protocol. RPE also presented significant differences between trials (p<0,001). Rehydration strategy was effective to maintain hydration status and attenuate the increase on PSI and RPE, which has important implications for sports, especially those with more than 45 minutes |
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Revista Brasileira de Cineantropometria & Desempenho Humano (Online) |
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Rehydration during exercise in the heat reduces physiological strain index in healthy adultsReidratação durante exercício no calor reduz o índice de esforço fisiológico em adultos saudáveisExercise in the heat leads to physiological alterations that reflect mainly on the cardiovascular system. The physiological strain index (PSI) uses heart rate (HR) and rectal temperature (Tre) to evaluate the cardiovascular strain and lately it has been brought up on the literature. However, few studies used the PSI to evaluate its response following dehydration and rehydration protocols. Thus, the aim of the present study was to verify the effect of rehydration proportional to fluid losses during prolonged exercise in the heat on hydration status, PSI and rating of perceived exertion (RPE) in healthy subjects. Ten volunteers performed two sessions of exercise in heat. The first with fluid restriction until subjects reach 2% of body mass (BM) reduction. The second with rehydration proportional to fluid losses of the first. HR and Tre were monitored during the entire exercise protocol in order to calculate PSI. Subjects also reported their RPE. BM, urine specific gravity (USG) and urine color (UC) were measured to evaluate hydration status. Results demonstrated greater PSI in the fluid restricted trial compared to the rehydration trial from 45 minutes of exercise (p<0,05), and that differences remain significant until the end of the protocol. RPE also presented significant differences between trials (p<0,001). Rehydration strategy was effective to maintain hydration status and attenuate the increase on PSI and RPE, which has important implications for sports, especially those with more than 45 minutesO exercício no calor provoca alterações fisiológicas que refletem principalmente no sistema cardiovascular. O índice de esforço fisiológico (IEF), que utiliza o comportamento da temperatura corporal (Tre) e da frequência cardíaca (FC) para avaliar o nível de sobrecarga cardiovascular vem sendo preconizado na literatura. Porém, poucos estudos avaliaram os efeitos da desidratação e reidratação sobre este marcador. Assim, o objetivo foi verificar o efeito de uma estratégia de reidratação proporcional à perda hídrica durante exercício prolongado no calor sobre o estado de hidratação, IEF e taxa de percepção de esforço (TPE) de sujeitos saudáveis. Dez sujeitos realizaram duas sessões de exercício no calor, sendo a primeira sem reidratação (redução de 2% da massa corporal) (MC) e a segunda com reidratação (água mineral) em um volume proporcional à perda da primeira sessão. A FC e a Tre foram monitoradas durante o exercício para o cálculo do IEF. A TPE também foi obtida durante o exercício. A MC, gravidade específica (GEU) e coloração da urina (COR) foram mensuradas antes e após o exercício para avaliação do estado de hidratação. Os resultados demonstraram maior IEF na situação sem reidratação comparada à situação com reidratação a partir de 45 minutos de exercício (p<0,05), mantendo-se significativa até o final do protocolo. A TPE também apresentou diferença significativa entre as situações (p<0,001). A estratégia de reidratação foi efetiva para manter o estado de hidratação, atenuar o IEF e a TPE, trazendo importantes implicações para práticas desportivas, sobretudo àquelas que têm duração superior a 45 minutos.Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil2014-10-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion"Avaliado por Pares",Original paperAvaliado por ParesArtigos Originaisapplication/pdfapplication/pdfhttps://periodicos.ufsc.br/index.php/rbcdh/article/view/1980-0037.2014v16n6p62910.1590/1980-0037.2014v16n6p629Brazilian Journal of Kinanthropometry and Human Performance; Vol. 16 No. 6 (2014); 629-637Revista Brasileira de Cineantropometria e Desempenho Humano; v. 16 n. 6 (2014); 629-6371980-00371415-8426reponame:Revista Brasileira de Cineantropometria & Desempenho Humano (Online)instname:Universidade Federal de Santa Catarina (UFSC)instacron:UFSCengporhttps://periodicos.ufsc.br/index.php/rbcdh/article/view/1980-0037.2014v16n6p629/27912https://periodicos.ufsc.br/index.php/rbcdh/article/view/1980-0037.2014v16n6p629/27913Pompermayer, Marcelo GavaRodrigues, RodrigoBaroni, Bruno ManfrediniLupion, Raquel de OliveiraMeyer, FláviaVaz, Marco Aurélioinfo:eu-repo/semantics/openAccess2018-12-05T08:28:35Zoai:periodicos.ufsc.br:article/29634Revistahttps://periodicos.ufsc.br/index.php/rbcdh/PUBhttps://periodicos.ufsc.br/index.php/rbcdh/oairbcdh@contato.ufsc.br || portaldeperiodicos.bu@contato.ufsc.br1980-00371415-8426opendoar:2018-12-05T08:28:35Revista Brasileira de Cineantropometria & Desempenho Humano (Online) - Universidade Federal de Santa Catarina (UFSC)false |
dc.title.none.fl_str_mv |
Rehydration during exercise in the heat reduces physiological strain index in healthy adults Reidratação durante exercício no calor reduz o índice de esforço fisiológico em adultos saudáveis |
title |
Rehydration during exercise in the heat reduces physiological strain index in healthy adults |
spellingShingle |
Rehydration during exercise in the heat reduces physiological strain index in healthy adults Pompermayer, Marcelo Gava |
title_short |
Rehydration during exercise in the heat reduces physiological strain index in healthy adults |
title_full |
Rehydration during exercise in the heat reduces physiological strain index in healthy adults |
title_fullStr |
Rehydration during exercise in the heat reduces physiological strain index in healthy adults |
title_full_unstemmed |
Rehydration during exercise in the heat reduces physiological strain index in healthy adults |
title_sort |
Rehydration during exercise in the heat reduces physiological strain index in healthy adults |
author |
Pompermayer, Marcelo Gava |
author_facet |
Pompermayer, Marcelo Gava Rodrigues, Rodrigo Baroni, Bruno Manfredini Lupion, Raquel de Oliveira Meyer, Flávia Vaz, Marco Aurélio |
author_role |
author |
author2 |
Rodrigues, Rodrigo Baroni, Bruno Manfredini Lupion, Raquel de Oliveira Meyer, Flávia Vaz, Marco Aurélio |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Pompermayer, Marcelo Gava Rodrigues, Rodrigo Baroni, Bruno Manfredini Lupion, Raquel de Oliveira Meyer, Flávia Vaz, Marco Aurélio |
description |
Exercise in the heat leads to physiological alterations that reflect mainly on the cardiovascular system. The physiological strain index (PSI) uses heart rate (HR) and rectal temperature (Tre) to evaluate the cardiovascular strain and lately it has been brought up on the literature. However, few studies used the PSI to evaluate its response following dehydration and rehydration protocols. Thus, the aim of the present study was to verify the effect of rehydration proportional to fluid losses during prolonged exercise in the heat on hydration status, PSI and rating of perceived exertion (RPE) in healthy subjects. Ten volunteers performed two sessions of exercise in heat. The first with fluid restriction until subjects reach 2% of body mass (BM) reduction. The second with rehydration proportional to fluid losses of the first. HR and Tre were monitored during the entire exercise protocol in order to calculate PSI. Subjects also reported their RPE. BM, urine specific gravity (USG) and urine color (UC) were measured to evaluate hydration status. Results demonstrated greater PSI in the fluid restricted trial compared to the rehydration trial from 45 minutes of exercise (p<0,05), and that differences remain significant until the end of the protocol. RPE also presented significant differences between trials (p<0,001). Rehydration strategy was effective to maintain hydration status and attenuate the increase on PSI and RPE, which has important implications for sports, especially those with more than 45 minutes |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-10-30 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion "Avaliado por Pares", Original paper Avaliado por Pares Artigos Originais |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://periodicos.ufsc.br/index.php/rbcdh/article/view/1980-0037.2014v16n6p629 10.1590/1980-0037.2014v16n6p629 |
url |
https://periodicos.ufsc.br/index.php/rbcdh/article/view/1980-0037.2014v16n6p629 |
identifier_str_mv |
10.1590/1980-0037.2014v16n6p629 |
dc.language.iso.fl_str_mv |
eng por |
language |
eng por |
dc.relation.none.fl_str_mv |
https://periodicos.ufsc.br/index.php/rbcdh/article/view/1980-0037.2014v16n6p629/27912 https://periodicos.ufsc.br/index.php/rbcdh/article/view/1980-0037.2014v16n6p629/27913 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil |
publisher.none.fl_str_mv |
Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil |
dc.source.none.fl_str_mv |
Brazilian Journal of Kinanthropometry and Human Performance; Vol. 16 No. 6 (2014); 629-637 Revista Brasileira de Cineantropometria e Desempenho Humano; v. 16 n. 6 (2014); 629-637 1980-0037 1415-8426 reponame:Revista Brasileira de Cineantropometria & Desempenho Humano (Online) instname:Universidade Federal de Santa Catarina (UFSC) instacron:UFSC |
instname_str |
Universidade Federal de Santa Catarina (UFSC) |
instacron_str |
UFSC |
institution |
UFSC |
reponame_str |
Revista Brasileira de Cineantropometria & Desempenho Humano (Online) |
collection |
Revista Brasileira de Cineantropometria & Desempenho Humano (Online) |
repository.name.fl_str_mv |
Revista Brasileira de Cineantropometria & Desempenho Humano (Online) - Universidade Federal de Santa Catarina (UFSC) |
repository.mail.fl_str_mv |
rbcdh@contato.ufsc.br || portaldeperiodicos.bu@contato.ufsc.br |
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1789435123518668800 |