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Separate and combined effects of airflow and rehydration during exercise in the heat.
Med Sci Sports Exerc. 2007 Oct; 39(10):1720-6.MS

Abstract

PURPOSE

To determine whether airflow is required to obtain the beneficial effects of rehydration (thermoregulatory and cardiovascular) during exercise in dry heat.

METHODS

Ten moderately trained (VO2max = 55 +/- 8 mL.kg(-1).min(-1)) heat acclimated males pedaled for 60 min at 60% VO2max in a hot-dry environment (36 +/- 1 degrees C; 29 +/- 2% relative humidity) on four different occasions: 1) without rehydration or forced airflow (control trial; CON); 2) rehydrating 100% of sweat losses by ingestion of a 6% carbohydrate-electrolyte solution (rehydration trial; REH); 3) receiving airflow at a velocity of 2.55 m.s(-1) (wind trial; WIND); and 4) combining airflow and rehydration (W + R).

RESULTS

Without airflow, rehydration alone (REH) did not lower rectal temperature below CON (39.0 +/- 0.1 vs 39.1 +/- 0.1 degrees C at 60 min; respectively). However, with airflow, rehydration reduced final rectal temperature (38.8 +/- 0.1 vs 38.5 +/- 0.1 degrees C; P < 0.05; WIND vs W + R). In the trials with wind (WIND and W + R), skin temperature was reduced by about 0.6 degrees C (P < 0.05), and heart rate drift was prevented. In the trials with rehydration (REH and W + R trials), cardiac output (CO2-rebreathing technique) was maintained higher than CON (16.5 +/- 0.4 and 17.0 +/- 0.7 vs 15.4 +/- 0.4 L.min(-1), respectively; P < 0.05).

CONCLUSION

When exercising in a hot-dry environment, airflow is required for rehydration to improve thermoregulation and cardiovascular function.

Authors+Show Affiliations

University of Castilla-La Mancha, Exercise Physiology Laboratory, Toledo, Spain. Ricardo.Mora@uclm.esNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17909398

Citation

Mora-Rodriguez, Ricardo, et al. "Separate and Combined Effects of Airflow and Rehydration During Exercise in the Heat." Medicine and Science in Sports and Exercise, vol. 39, no. 10, 2007, pp. 1720-6.
Mora-Rodriguez R, Del Coso J, Aguado-Jimenez R, et al. Separate and combined effects of airflow and rehydration during exercise in the heat. Med Sci Sports Exerc. 2007;39(10):1720-6.
Mora-Rodriguez, R., Del Coso, J., Aguado-Jimenez, R., & Estevez, E. (2007). Separate and combined effects of airflow and rehydration during exercise in the heat. Medicine and Science in Sports and Exercise, 39(10), 1720-6.
Mora-Rodriguez R, et al. Separate and Combined Effects of Airflow and Rehydration During Exercise in the Heat. Med Sci Sports Exerc. 2007;39(10):1720-6. PubMed PMID: 17909398.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Separate and combined effects of airflow and rehydration during exercise in the heat. AU - Mora-Rodriguez,Ricardo, AU - Del Coso,Juan, AU - Aguado-Jimenez,Roberto, AU - Estevez,Emma, PY - 2007/10/3/pubmed PY - 2008/1/12/medline PY - 2007/10/3/entrez SP - 1720 EP - 6 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 39 IS - 10 N2 - PURPOSE: To determine whether airflow is required to obtain the beneficial effects of rehydration (thermoregulatory and cardiovascular) during exercise in dry heat. METHODS: Ten moderately trained (VO2max = 55 +/- 8 mL.kg(-1).min(-1)) heat acclimated males pedaled for 60 min at 60% VO2max in a hot-dry environment (36 +/- 1 degrees C; 29 +/- 2% relative humidity) on four different occasions: 1) without rehydration or forced airflow (control trial; CON); 2) rehydrating 100% of sweat losses by ingestion of a 6% carbohydrate-electrolyte solution (rehydration trial; REH); 3) receiving airflow at a velocity of 2.55 m.s(-1) (wind trial; WIND); and 4) combining airflow and rehydration (W + R). RESULTS: Without airflow, rehydration alone (REH) did not lower rectal temperature below CON (39.0 +/- 0.1 vs 39.1 +/- 0.1 degrees C at 60 min; respectively). However, with airflow, rehydration reduced final rectal temperature (38.8 +/- 0.1 vs 38.5 +/- 0.1 degrees C; P < 0.05; WIND vs W + R). In the trials with wind (WIND and W + R), skin temperature was reduced by about 0.6 degrees C (P < 0.05), and heart rate drift was prevented. In the trials with rehydration (REH and W + R trials), cardiac output (CO2-rebreathing technique) was maintained higher than CON (16.5 +/- 0.4 and 17.0 +/- 0.7 vs 15.4 +/- 0.4 L.min(-1), respectively; P < 0.05). CONCLUSION: When exercising in a hot-dry environment, airflow is required for rehydration to improve thermoregulation and cardiovascular function. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/17909398/Separate_and_combined_effects_of_airflow_and_rehydration_during_exercise_in_the_heat_ L2 - https://doi.org/10.1249/mss.0b013e3180de4dad DB - PRIME DP - Unbound Medicine ER -