Rehydration during exercise in the heat reduces physiological strain index in healthy adults

Detalhes bibliográficos
Autor(a) principal: Pompermayer, Marcelo Gava
Data de Publicação: 2014
Outros Autores: Rodrigues, Rodrigo, Baroni, Bruno Manfredini, Lupion, Raquel de Oliveira, Meyer, Flávia, Vaz, Marco Aurélio
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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spelling 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
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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
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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
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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)
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instname_str Universidade Federal de Santa Catarina (UFSC)
instacron_str UFSC
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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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