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PHYSIOLOGICAL AND PERCEPTUAL STRESS COMPARED BETWEEN HYDRATION BEVERAGES DURING AND FOLLOWING WORK IN THE HEAT

Abstract

Patric S. Waymire1, Whitley C. Atkins1, Abby L. Flynn1, Rachel M. Held1, Rachel A. Backes1, Brendon P. McDermott1, FACSM1; University of Arkansas, Fayetteville, Arkansas

Chronic kidney disease has increased in individuals working in the heat who experience repetitive subclinical acute kidney injury(AKI). Elevation of biomarkers for AKI have been linked to sugar-sweetened beverage (SSB) and fructose consumption during and following exercise in the heat. PURPOSE: Investigate the impact of SSB on heart rate (HR), rectal temperature (Trec), urinary neutrophil gelatinase-associated lipocalin (uNGAL), urine specific gravity (USG), and perceptual measures during and following simulated industrial labor in the heat. METHODS: A double-blind, counterbalanced, randomized controlled trial was conducted with 20 male participants (24 ±2y, 179 ±6cm, 24.7 ±9.0% body fat). Participants carried out simulated industrial labor (2 hr including 10-min equilibration, 2 45-min work and two 15-min rest bouts) for two matched trials in relevant clothing (30°C, 55%RH).The only difference between trials was ingestion of either SSB or placebo. HR, Trec, and perceptual measures were monitored throughout the trial with USG, and uNGAL measured at pre-trial, post-trial, 3-hr post-trial and 16-hr post-trial. RESULTS: There was no significant HR difference between trials (p=.209). Likewise, maximum Trec reached during simulated work was not different between trials (SSB: 38.9 ±0.5°C; placebo: 38.7 ±0.4°C;p=.330). USG was not different between trials(p=.277). Post-exercise USG was elevated compared to baseline and 3-hr post-trial (p≤.001). USG 16-hr post-trial was elevated compared to baseline (p=.043) and 3-hr post-trial (.001). There were no trial differences with uNGAL (p=.992). uNGAL was significantly greater post-trial compared to baseline (p=.047) and 3-hr post-trial (p=.004). uNGAL 3-hr post-exercise was significantly less than baseline (.011).Regardless of time point, SSB increased thirst perception (p=.026), thermal sensation (p=.027), and RPE (p=.042) compared to placebo. There were no trial differences in overall muscle pain (p=.096). CONCLUSION: HR, Trec, and USG remained unaffected between trials alongside no differences with uNGAL or muscle pain. Despite minor perceptual differences, when workers were well-hydrated throughout simulated work in the heat, SSB did not affect hydration status or AKI biomarkers. Future studies should evaluate dehydrated conditions.

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