Environmental Temperature and Exercise-Induced Blood Oxidative Stress
- Autores: John C. Quindry, Lindsey E. Miller, Graham R. McGinnis, Brian Matthew Kliszczewicz, Dustin R. Slivka, Charles L. Dumke, John S. Cuddy, Brent C. Ruby
- Localización: International journal of sport nutrition and exercise metabolism, ISSN 1526-484X, ISSN-e 1543-2742, Vol. 23, Nº. 2, 2013, págs. 128-136
- Idioma: inglés
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Resumen
Previous research findings indicate that environmental temperature can influence exercise-induced oxidativestress responses, although the response to variable temperatures is unknown. The purpose of this study was to investigate the effect of warm, cold, and �neutral,� or room, environmental temperatures on the blood oxidative stress associated with exercise and recovery. Participants (N = 12, age 27 ± 5 yr, VO2max = 56.7 ± 5.8 ml · kg�1 · min�1, maximal cycle power output = 300 ± 39 W) completed 3 exercise sessions consisting of a 1-hr ride at 60% Wmax, at 40% relative humidity in warm (33 °C), cold (7 °C), and room-temperature environments (20 °C) in a randomized crossover fashion. Rectal core temperature was monitored continually as participants remained in the respective trial temperature throughout a 3-hr recovery. Blood was collected preexercise and immediately, 1 hr, and 3 hr postexercise and analyzed for oxidative-stress markers including ferric-reducing ability of plasma (FRAP), Trolox-equivalent antioxidant capacity (TEAC), lipid hydroperoxides, and protein carbonyls. Core temperature was significantly elevated by all exercise trials, but recovery core temperatures reflected the given environment. FRAP (p < .001), TEAC (p < .001), and lipid hydroperoxides (p < .001) were elevated after warm exercise while protein carbonyls were not altered (p > .05). These findings indicate that moderate-intensity exercise and associated recovery in a warm environment elicits a blood oxidative-stress response not observed at comparable exercise performed at lower temperatures.
