Water Bolus Volumes During Continuous Exercise in Heat

State University of New York at Buffalo16 enrolled

Overview

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.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

NONE

Enrollment

Conditions

Dehydration (Physiology)Hyperthermia

Interventions

Hydration protocol - 237 mL water bolusOTHER

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

Hydration protocol - 500 mL water bolusOTHER

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

Eligibility

Sex: MALEMin age: 18 YearsMax age: 39 YearsHealthy volunteers:

Medical Language ↔ Plain English

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

Locations (1)

Center for Research and Exercise in Special Environments

Buffalo, New York, United States

Outcomes

Primary Outcomes

Percent body mass loss

Percent body mass loss after water intake

Time frame: 2 hours

Core temperature

Core temperature after water intake

Time frame: 2 hours

Data from ClinicalTrials.gov

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