Water Bolus Volumes During Continuous Exercise in Heat

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.

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Key information

Conditions

Dehydration (Physiology) Body Temperature Changes Dehydration Heat Stress Disorders Hyperthermia Metabolic Diseases Nutritional and Metabolic Diseases Pathologic Processes Pathological Conditions, Signs and Symptoms Signs and Symptoms Water-Electrolyte Imbalance Wounds and Injuries

Age range

18 year–39 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

Center for Research and Exercise in Special Environments

Buffalo, New York, 14214, United States

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Hydration protocol - 237 mL water bolus

Other

Subjects consume 237 mL of water every 20 minutes during 2 hours of high intensity work in the heat.

Hydration protocol - 500 mL water bolus

Other

Subjects consume 500 mL of water every 40 minutes during 2 hours of high intensity work in the heat.

Primary outcomes

Percent body mass loss

Time frame: 2 hours

Percent body mass loss after water intake
Core temperature

Time frame: 2 hours

Core temperature after water intake

Sponsors and collaborators

Lead sponsor

State University of New York at Buffalo

Other

Registry information

Important dates

Study start: 2019
Primary completion: 2020
Study completion: 2020
First posted: Nov 3, 2020
Registry last updated: Nov 3, 2020

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed