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Abstract

Every year, elite groups of of marching arts performers travel across the United States during the summer months of June through August, where they encounter different climates. Daily training for marching arts performers often takes place outdoors in the heat, but it is unclear what these individuals experience with regard to their hydration levels. PURPOSE: The purpose of this study was to investigate daily changes in hydration status among marching arts performers. METHODS: For this pilot investigation, we studied 3 men and 1 woman (mean ± SD; age: 20 ± 1 y, height: 174.1 ± 4.6 cm, body mass: 70.0 ± 8.6 kg) and completed measurements on three training sessions, across three consecutive days. To assess their hydration status, urine samples were collected before and after a 4-hour training block for urine specific gravity (USG) analysis. RESULTS: There was no interaction between Day (1-3) and Time (p = 0.519; Day 1-Pre: 1.022 ± 0.002, Post: 1.012 ± 0.010; Day 2-Pre: 1.024 ± 0.002, Post: 1.018 ± 0.006; Day 3-Pre: 1.025 ± 0.004, Post: 1.020 ± 0.004), and there was no main effect of Time (p = 0.069). There was a main effect of Day (p = 0.021), with post-hoc analyses revealing that USG was significantly higher on Day 3 (1.022 ± 0.003) compared to Day 1 (1.017 ± 0.008). CONCLUSION: This pilot study suggests that these elite level performers progressively became more hypohydrated with each day of training. Further exploration of this topic should elucidate the magnitude of dehydration experienced by these individuals with daily training, which should help exercise professionals create more individualized hydration plans.

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