Water Bolus Volumes During Continuous Exercise in Heat

Not Applicable

Completed

• Conditions: Dehydration (Physiology); Hyperthermia
• Interventions: Other: Hydration protocol - 237 mL water bolus; Other: Hydration protocol - 500 mL water bolus

• Registration Number: NCT04613856
• Lead Sponsor: State University of New York at Buffalo

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.

Detailed Description

Not available

Study Timeline

• Study Start: 2019-04-17
• Primary Completion: 2020-03-12
• Study Completion: 2020-03-12
• Status Verified: 2020-10
• Study First Submitted: 2020-10-30
• Study First Submitted QC: 2020-11-02
• Last Update Submitted: 2020-11-02
• Study First Posted: 2020-11-03
• Last Update Posted: 2020-11-03

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 16

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

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Current Best Practice - 237 mL water bolus	Hydration protocol - 237 mL water bolus	-
New Intervention - 500 mL water bolus	Hydration protocol - 500 mL water bolus	-

Primary Outcome Measures

Name	Time	Method
Core temperature	2 hours	Core temperature after water intake
Percent body mass loss	2 hours	Percent body mass loss after water intake

Trial Locations

Locations (1)

Center for Research and Exercise in Special Environments; 🇺🇸 Buffalo, New York, United States