Perceptual responses in the heat after brief intravenous versus oral rehydration

C. M. Maresh, J. A. Herrera-Soto, L. E. Armstrong, D. J. Casa, S. A. Kavouras, Jr Hacker, T. A. Elliott, J. Stoppani, T. P. Scheett

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Purpose: The purpose of the study was to compare the effects of a brief period (20 min) of intravenous (IV) fluid rehydration and oral (ORAL) rehydration on ratings of perceived exertion (RPE), thirst, and thermal sensation (TS) during exercise in the heat. Methods: After dehydration (-4% of body weight), eight nonacclimated highly trained cyclists (age = 24 ± 1 yr; V̇O2 = 61.4 ± 0.8 mL·kg·min-1) performed three experimental trials. Rehydration (randomized, cross-over design) included: 1) ORAL (0.45% NaCl) equal to 50% of prior dehydration; 2) IV (0.45% NaCl) equal to 50% of prior dehydration; and 3) a control (CON), no fluid trial. Subjects then cycled at 74% V̇O2peak until volitional exhaustion in a hot environment (37°C). Results: Central (C-), local (L-), and overall-RPE (O-RPE) were significantly higher in CON compared to ORAL and IV at minutes 5 and 15 of exercise. C-RPE responses at minute 5 of exercise were lower (P < 0.05) during ORAL compared with IV, and C-RPE and O-RPE responses at minute 15 were lower (P < 0.05) during ORAL compared with IV. TS responses during CON were higher (P < 0.05) than ORAL and IV at minute 5, and TS was higher (P < 0.05) during IV versus ORAL at minute 15. TS were significantly correlated with all RPE responses at minute 15 in all trials. Thirst ratings were lower (P < 0.05) during ORAL compared with CON and IV at minutes 0, 5, and 15. Conclusion: It was concluded that ORAL resulted in lower RPE, thirst, and TS compared with CON and IV during exercise in the heat.

Original languageEnglish (US)
Pages (from-to)1039-1045
Number of pages7
JournalMedicine and science in sports and exercise
Volume33
Issue number6
DOIs
StatePublished - Jan 1 2001
Externally publishedYes

Fingerprint

Fluid Therapy
Hot Temperature
Thirst
Dehydration
Cross-Over Studies
Body Weight

Keywords

  • Dehydration
  • Exhaustive exercise
  • Ratings of perceived exertion
  • Thermal sensations
  • Thirst

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Maresh, C. M., Herrera-Soto, J. A., Armstrong, L. E., Casa, D. J., Kavouras, S. A., Hacker, J., ... Scheett, T. P. (2001). Perceptual responses in the heat after brief intravenous versus oral rehydration. Medicine and science in sports and exercise, 33(6), 1039-1045. https://doi.org/10.1097/00005768-200106000-00025

Perceptual responses in the heat after brief intravenous versus oral rehydration. / Maresh, C. M.; Herrera-Soto, J. A.; Armstrong, L. E.; Casa, D. J.; Kavouras, S. A.; Hacker, Jr; Elliott, T. A.; Stoppani, J.; Scheett, T. P.

In: Medicine and science in sports and exercise, Vol. 33, No. 6, 01.01.2001, p. 1039-1045.

Research output: Contribution to journalArticle

Maresh, CM, Herrera-Soto, JA, Armstrong, LE, Casa, DJ, Kavouras, SA, Hacker, J, Elliott, TA, Stoppani, J & Scheett, TP 2001, 'Perceptual responses in the heat after brief intravenous versus oral rehydration', Medicine and science in sports and exercise, vol. 33, no. 6, pp. 1039-1045. https://doi.org/10.1097/00005768-200106000-00025
Maresh, C. M. ; Herrera-Soto, J. A. ; Armstrong, L. E. ; Casa, D. J. ; Kavouras, S. A. ; Hacker, Jr ; Elliott, T. A. ; Stoppani, J. ; Scheett, T. P. / Perceptual responses in the heat after brief intravenous versus oral rehydration. In: Medicine and science in sports and exercise. 2001 ; Vol. 33, No. 6. pp. 1039-1045.
@article{eb95c1cab4d94cbb8ca6a00e6ac65fe4,
title = "Perceptual responses in the heat after brief intravenous versus oral rehydration",
abstract = "Purpose: The purpose of the study was to compare the effects of a brief period (20 min) of intravenous (IV) fluid rehydration and oral (ORAL) rehydration on ratings of perceived exertion (RPE), thirst, and thermal sensation (TS) during exercise in the heat. Methods: After dehydration (-4{\%} of body weight), eight nonacclimated highly trained cyclists (age = 24 ± 1 yr; V̇O2 = 61.4 ± 0.8 mL·kg·min-1) performed three experimental trials. Rehydration (randomized, cross-over design) included: 1) ORAL (0.45{\%} NaCl) equal to 50{\%} of prior dehydration; 2) IV (0.45{\%} NaCl) equal to 50{\%} of prior dehydration; and 3) a control (CON), no fluid trial. Subjects then cycled at 74{\%} V̇O2peak until volitional exhaustion in a hot environment (37°C). Results: Central (C-), local (L-), and overall-RPE (O-RPE) were significantly higher in CON compared to ORAL and IV at minutes 5 and 15 of exercise. C-RPE responses at minute 5 of exercise were lower (P < 0.05) during ORAL compared with IV, and C-RPE and O-RPE responses at minute 15 were lower (P < 0.05) during ORAL compared with IV. TS responses during CON were higher (P < 0.05) than ORAL and IV at minute 5, and TS was higher (P < 0.05) during IV versus ORAL at minute 15. TS were significantly correlated with all RPE responses at minute 15 in all trials. Thirst ratings were lower (P < 0.05) during ORAL compared with CON and IV at minutes 0, 5, and 15. Conclusion: It was concluded that ORAL resulted in lower RPE, thirst, and TS compared with CON and IV during exercise in the heat.",
keywords = "Dehydration, Exhaustive exercise, Ratings of perceived exertion, Thermal sensations, Thirst",
author = "Maresh, {C. M.} and Herrera-Soto, {J. A.} and Armstrong, {L. E.} and Casa, {D. J.} and Kavouras, {S. A.} and Jr Hacker and Elliott, {T. A.} and J. Stoppani and Scheett, {T. P.}",
year = "2001",
month = "1",
day = "1",
doi = "10.1097/00005768-200106000-00025",
language = "English (US)",
volume = "33",
pages = "1039--1045",
journal = "Medicine and Science in Sports and Exercise",
issn = "0195-9131",
publisher = "Lippincott Williams and Wilkins",
number = "6",

}

TY - JOUR

T1 - Perceptual responses in the heat after brief intravenous versus oral rehydration

AU - Maresh, C. M.

AU - Herrera-Soto, J. A.

AU - Armstrong, L. E.

AU - Casa, D. J.

AU - Kavouras, S. A.

AU - Hacker, Jr

AU - Elliott, T. A.

AU - Stoppani, J.

AU - Scheett, T. P.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Purpose: The purpose of the study was to compare the effects of a brief period (20 min) of intravenous (IV) fluid rehydration and oral (ORAL) rehydration on ratings of perceived exertion (RPE), thirst, and thermal sensation (TS) during exercise in the heat. Methods: After dehydration (-4% of body weight), eight nonacclimated highly trained cyclists (age = 24 ± 1 yr; V̇O2 = 61.4 ± 0.8 mL·kg·min-1) performed three experimental trials. Rehydration (randomized, cross-over design) included: 1) ORAL (0.45% NaCl) equal to 50% of prior dehydration; 2) IV (0.45% NaCl) equal to 50% of prior dehydration; and 3) a control (CON), no fluid trial. Subjects then cycled at 74% V̇O2peak until volitional exhaustion in a hot environment (37°C). Results: Central (C-), local (L-), and overall-RPE (O-RPE) were significantly higher in CON compared to ORAL and IV at minutes 5 and 15 of exercise. C-RPE responses at minute 5 of exercise were lower (P < 0.05) during ORAL compared with IV, and C-RPE and O-RPE responses at minute 15 were lower (P < 0.05) during ORAL compared with IV. TS responses during CON were higher (P < 0.05) than ORAL and IV at minute 5, and TS was higher (P < 0.05) during IV versus ORAL at minute 15. TS were significantly correlated with all RPE responses at minute 15 in all trials. Thirst ratings were lower (P < 0.05) during ORAL compared with CON and IV at minutes 0, 5, and 15. Conclusion: It was concluded that ORAL resulted in lower RPE, thirst, and TS compared with CON and IV during exercise in the heat.

AB - Purpose: The purpose of the study was to compare the effects of a brief period (20 min) of intravenous (IV) fluid rehydration and oral (ORAL) rehydration on ratings of perceived exertion (RPE), thirst, and thermal sensation (TS) during exercise in the heat. Methods: After dehydration (-4% of body weight), eight nonacclimated highly trained cyclists (age = 24 ± 1 yr; V̇O2 = 61.4 ± 0.8 mL·kg·min-1) performed three experimental trials. Rehydration (randomized, cross-over design) included: 1) ORAL (0.45% NaCl) equal to 50% of prior dehydration; 2) IV (0.45% NaCl) equal to 50% of prior dehydration; and 3) a control (CON), no fluid trial. Subjects then cycled at 74% V̇O2peak until volitional exhaustion in a hot environment (37°C). Results: Central (C-), local (L-), and overall-RPE (O-RPE) were significantly higher in CON compared to ORAL and IV at minutes 5 and 15 of exercise. C-RPE responses at minute 5 of exercise were lower (P < 0.05) during ORAL compared with IV, and C-RPE and O-RPE responses at minute 15 were lower (P < 0.05) during ORAL compared with IV. TS responses during CON were higher (P < 0.05) than ORAL and IV at minute 5, and TS was higher (P < 0.05) during IV versus ORAL at minute 15. TS were significantly correlated with all RPE responses at minute 15 in all trials. Thirst ratings were lower (P < 0.05) during ORAL compared with CON and IV at minutes 0, 5, and 15. Conclusion: It was concluded that ORAL resulted in lower RPE, thirst, and TS compared with CON and IV during exercise in the heat.

KW - Dehydration

KW - Exhaustive exercise

KW - Ratings of perceived exertion

KW - Thermal sensations

KW - Thirst

UR - http://www.scopus.com/inward/record.url?scp=0035013966&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035013966&partnerID=8YFLogxK

U2 - 10.1097/00005768-200106000-00025

DO - 10.1097/00005768-200106000-00025

M3 - Article

C2 - 11404671

AN - SCOPUS:0035013966

VL - 33

SP - 1039

EP - 1045

JO - Medicine and Science in Sports and Exercise

JF - Medicine and Science in Sports and Exercise

SN - 0195-9131

IS - 6

ER -