Water Bolus Volumes During Continuous Exercise in Heat

NCT04613856 | Completed

• 1 other identifier: STUDY00003387
• Study Type: interventional
• Target: 16
• Locations: 1 country
• Sites: 1

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.

Conditions

Dehydration (Physiology); Hyperthermia

Outcome Measures

Primary Outcomes (2)

• Percent body mass loss

  Percent body mass loss after water intake

  2 hours

• Core temperature

  Core temperature after water intake

  2 hours

Study Arms (2)

Current Best Practice - 237 mL water bolus

ACTIVE COMPARATOR

Other: Hydration protocol - 237 mL water bolus

New Intervention - 500 mL water bolus

EXPERIMENTAL

Other: Hydration protocol - 500 mL water bolus

Interventions

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.

Current Best Practice - 237 mL water bolus

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.

New Intervention - 500 mL water bolus

Eligibility Criteria

• Age: 18 Years - 39 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Male
• y old
• Self-reported to be healthy

You may not qualify if:

• 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

Sponsors & Collaborators

• State University of New York at Buffalo: lead

Study Sites (1)

Center for Research and Exercise in Special Environments

Buffalo, New York, 14214, United States

Location

MeSH Terms

Conditions

Dehydration; Hyperthermia

Condition Hierarchy (Ancestors)

Water-Electrolyte Imbalance; Metabolic Diseases; Nutritional and Metabolic Diseases; Pathologic Processes; Pathological Conditions, Signs and Symptoms; Body Temperature Changes; Signs and Symptoms; Heat Stress Disorders; Wounds and Injuries

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: PREVENTION
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Principal Investigator

Model Details: Randomized, counterbalanced, crossover study

Study Record Dates

• First Submitted: October 30, 2020
• First Posted: November 3, 2020
• Study Start: April 17, 2019
• Primary Completion: March 12, 2020
• Study Completion: March 12, 2020
• Last Updated: November 3, 2020

Record last verified: 2020-10

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)