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- W2055705875 abstract "1481 The purpose of this study was to investigate the effects of ingesting a nearly isotonic sodium beverage on shifts in plasma volume, exercise endurance performance, cardiovascular, and thermoregulatory variables. Each subject consumed 10 ml per kilogram body weight of a nearly isotonic (255 mOsm·Kg−1) high sodium (164 mEq Na+) beverage (HS), or hypotonic (94 mOsm·Kg-−1), no sodium placebo (NS) beverage in a randomized crossover design. Each subject then cycled for 45 min at 70% of predetermined maximal work rate. Rectal temperature, heart rate, rating of perceived exertion, plasma volume, and sweat rate were monitored. In addition, a localized area of the forearm was stimulated, via iontophoresis of Pilocarpine, in an attempt to maximize sweat production in that area. A 15 min maximal effort performance time trial followed. HS and NS ingestion lead to a significantly different (p<.05) 3.1% expansion and a 4.7% reduction in resting baseline plasma volume, respectively. HS maintained plasma volume during exercise to a significantly greater extent (p<.05) than the NS at 15 and 30 min, but not at 45 min of exercise. There was a significant improvement in endurance following HS ingestion (p<.05), with each subject performing 291.5 kJ of work compared to 267.4 kJ following NS. No significant differences were observed for heart rate, core temperature, rate of perceived exertion, total body sweat rate or localized forearm sweat rate between treatments. Additional cholinergic stimulation of the forearm sweat glands did not result in any significant increase in sweat production (p>.05) over nonstimulated glands. In conclusion, HS ingestion increased preexercise plasma volumes, maintained 15 and 30 min exercise plasma volumes, and improved an endurance performance time trial better than a NS. There was no compromise in thermoregulation attributed to HS. Finally, added cholinergic stimulation of sweat glands did not produce a sweat production greater than that of nonstimulated glands." @default.
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- W2055705875 date "1999-05-01" @default.
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- W2055705875 title "SODIUM FACILITATED HYPERVOLEMIA AND CYCLE ERGOMETRY ENDURANCE PERFORMANCE" @default.
- W2055705875 doi "https://doi.org/10.1097/00005768-199905001-01477" @default.
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