Dehydration (Physiology), Hyperthermia
Conditions
Brief summary
Hydration is important to all individuals including occupational workers who complete physical activity in the heat. Current best practice guidelines suggest drinking a cup of water every 15-20 minutes during activity in a hot environment, but research shows this may not be ideal for best maintaining hydration. The goal of this study is to determine if larger, more frequent water boluses better maintain hydration than smaller, less frequent water boluses during moderate intensity physical activity in the heat.
Interventions
OTHERHydration protocol - 237 mL water bolus
Subjects consume 237 mL of water every 20 minutes during 2 hours of high intensity work in the heat.
OTHERHydration protocol - 500 mL water bolus
Subjects consume 500 mL of water every 40 minutes during 2 hours of high intensity work in the heat.
Sponsors
State University of New York at Buffalo
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
PREVENTION
Masking
NONE
Intervention model description
Randomized, counterbalanced, crossover study
Eligibility
Sex/Gender
MALE
Age
18 Years to 39 Years
Healthy volunteers
Yes
Inclusion criteria
* Male * 18-39 y old * Self-reported to be healthy
Exclusion criteria
* Female * Not within defined age range * History of any cardiovascular, neurologic, or metabolic disease * Current tobacco use or regular use within the last 2 years. * Taking medications with known thermoregulatory or cardiovascular effects (e.g., aspirin, beta blockers, diuretics, psychotropics, etc.) * Inability to follow the rules of the protocols or understand the consent form
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Percent body mass loss | 2 hours | Percent body mass loss after water intake |
| Core temperature | 2 hours | Core temperature after water intake |
Countries
United States
Outcome results
None listed