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Article

A Case-Series Observation of Sweat Rate Variability in Endurance-Trained Athletes

Department of Kinesiology, Mississippi State University, Starkville, MS 39762, USA
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Author to whom correspondence should be addressed.
Academic Editors: Douglas J. Casa and Stavros Kavouras
Nutrients 2021, 13(6), 1807; https://doi.org/10.3390/nu13061807
Received: 15 April 2021 / Revised: 21 May 2021 / Accepted: 24 May 2021 / Published: 26 May 2021
(This article belongs to the Special Issue Hydration and Fluid Needs during Physical Activity)
Adequate fluid replacement during exercise is an important consideration for athletes, however sweat rate (SR) can vary day-to-day. The purpose of this study was to investigate day-to-day variations in SR while performing self-selected exercise sessions to evaluate error in SR estimations in similar temperature conditions. Thirteen endurance-trained athletes completed training sessions in a case-series design 1x/week for a minimum 30 min of running/biking over 24 weeks. Body mass was recorded pre/post-training and corrected for fluid consumption. Data were split into three Wet-Bulb Globe Thermometer (WBGT) conditions: LOW (<10 °C), MOD (10–19.9 °C), HIGH (>20 °C). No significant differences existed in exercise duration, distance, pace, or WBGT for any group (p > 0.07). Significant differences in SR variability occurred for all groups, with average differences of: LOW = 0.15 L/h; MOD = 0.14 L/h; HIGH = 0.16 L/h (p < 0.05). There were no significant differences in mean SR between LOW-MOD (p > 0.9), but significant differences between LOW-HIGH and MOD-HIGH (p < 0.03). The assessment of SR can provide useful data for determining hydration strategies. The significant differences in SR within each temperature range indicates a single assessment may not accurately represent an individual’s typical SR even in similar environmental conditions. View Full-Text
Keywords: hypohydration; hyperhydration; hyponatremia; fluid loss; fluid balance hypohydration; hyperhydration; hyponatremia; fluid loss; fluid balance
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MDPI and ACS Style

Smith, J.W.; Bello, M.L.; Price, F.G. A Case-Series Observation of Sweat Rate Variability in Endurance-Trained Athletes. Nutrients 2021, 13, 1807. https://doi.org/10.3390/nu13061807

AMA Style

Smith JW, Bello ML, Price FG. A Case-Series Observation of Sweat Rate Variability in Endurance-Trained Athletes. Nutrients. 2021; 13(6):1807. https://doi.org/10.3390/nu13061807

Chicago/Turabian Style

Smith, JohnEric W., Marissa L. Bello, and Ffion G. Price 2021. "A Case-Series Observation of Sweat Rate Variability in Endurance-Trained Athletes" Nutrients 13, no. 6: 1807. https://doi.org/10.3390/nu13061807

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