Heat Acclimation, Hand Cooling Efficacy, and Adaptation Maintenance.

Heat Clinical Trial

Official title:

The Effect of Heat Acclimation on Repeated Bouts of Strenuous Heat Stress, Hand Cooling Efficacy, and the Maintenance Thereof.

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04053465
• Other study ID #: H14-188
• Status: Completed
• Phase: N/A
• Start date: August 1, 2014
• Est. completion date: March 31, 2015

Study information

• Verified date: February 2020
• Source: University of Connecticut
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This study had three aims:

1. To determine the impact of consecutive days of exercise on thermoregulation and cardiovascular strain.

2. To determine the efficacy of a hand cooling device to cool individuals throughout a heat acclimation period.

3. To assess the maintenance of thermoregulatory and cardiovascular adaptations derived from heat acclimation during a 25-day intermittent exercise-heat exposure protocol.

Description:

Participants completed 14 days of exercise heat acclimation in either a hot or cool environment, followed by a heat or cool exercise exposure every 5th day for 25 days. Cardiovascular, thermoregulatory, and perceptual strain were measured throughout exercise each day. Hydration assessment and stress response via blood biomarkers were measured before and after exercise. Aerobic capacity was measured before and after heat acclimation as well as after the intermittent exercise-heat exposure. Hand cooling was implemented periodically during exercise-heat stress visits to determine cooling efficacy before and after heat acclimation.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 34
• Est. completion date: March 31, 2015
• Est. primary completion date: March 31, 2015
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Male
• Age group: 18 Years to 35 Years

Eligibility

Inclusion Criteria:

• no chronic health problems

• no previous history of exertional heat stroke within the past 3 years

• no history of cardiovascular, metabolic or respiratory disease

• no current musculoskeletal injury that limits physical activity

Exclusion Criteria:

• women

• exercise less than once per week

• VO2max < 45 ml/kg/min

Related Conditions & MeSH terms

• Heat

Intervention

Other:
• Heat acclimation
14 days of aerobic exercise in a hot environment
• Exercise in a cool environment
14 days of aerobic exercise in a cool environment

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
University of Connecticut

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Internal Body Temperature	Rectal temperature was assessed five days following measurement at baseline.	5 days
Secondary	Heart Rate	Heart rate was assessed five days following baseline.	5 days