Rehydrating Efficacy of Maple Water After Exercise-Induced Dehydration

Abstract

Dehydration impairs physiological function and physical performance, thus understanding effective rehydration strategies is paramount. Despite growing interest in natural rehydrating beverages, no study has examined maple water (MW). Purpose: To investigate the rehydrating efficacy of MW after exercise-induced dehydration.Methods: Using a single-blind, counterbalanced, crossover design, we compared the rehydrating efficacy of MW vs. maple-flavored bottled water (control) in 26 young healthy (22 ± 4 yrs., 24 ± 4 kg/m 2 ) males (n = 13) and females (n = 13) after exercise-induced dehydration (~2.0%ΔBody Weight [BW]) in the heat (30°C, 50% relative humidity [RH]). Hydration indicators (BW, salivary and urine osmolality [SOsm/UOsm], urine specific gravity [USG], urine volume [UV], urine color [UC]), thirst, fatigue, and recovery (heart rate [HR)], and HR variability [HRV]) were taken at baseline, post-exercise, 0.5, 1, and 2 h post-consumption of 1 L of MW or control. Results: Following similar dehydration (~2%ΔBW), MW had no differential (p > 0.05) impact on any measure of rehydration. Likely due to greater beverage osmolality (81 ± 1.4 vs. 11 ± 0.7 mOsmol/kg), thirst sensation remained 12% higher with MW (p < 0.05). When sex was considered, females had lower UV, elevated UOsm (p < 0.05), trends for higher ΔBW, USG, but similar SOsm. Analysis of beverages and urine for antioxidant potential (AP) revealed a four-fold greater AP in MW, which increased peak urine AP (9.4 ± 0.7 vs. 7.6 ± 1.0 mmol, MW vs. control, p < 0.05). Conclusion: Electrolyte-containing MW, was similar in effectiveness to water, but has antioxidant properties. Furthermore, trends for sex differences were discovered in urinary, but not salivary, hydration markers, with discrepancies in kinetics between fluid compartments both warranting further study.

The Impact of Wrist Percooling on Physiological and Perceptual Responses during a Running Time Trial Performance in the Heat

“…Upon arrival, a urine sample was collected and hydration status was confirmed via urine specific gravity (USG < 1.020) as described previously [ 17 ]. If USG was >1.020, participants were given 500 mL of water and USG was retested thereafter (though as the participants were familiar with race preparations, this only occurred once out of 39 total visits).…”

European Resuscitation Council Guidelines 2021: First aid

“…For the following rehydration solutions, insufficient evidence is available to recommend their use: coconut water, 96,104 maple water, 110 yoghurt drink, 93 rooibos tea, 111 Chinese tea plus caffeine, 93 high alkaline water, 112 deep ocean 113,114 or commercial bottled water, 115 3% glycerol, 116 low-or non-alcoholic beer 102,108 or whey protein isolate solution. 117…”