Effect of Aging and Aerobic Fitness Level on Heat Dissipation

NCT04241900 | Completed

• 1 other identifier: 10. Aging and heat loss
• Study Type: interventional
• Target: 431
• Locations: 1 country
• Sites: 2

Brief Summary

In the context of global aging, the health risk factors associated with exercising or working in the heat for aging population are exacerbated by the rising in global surface temperatures. The purpose of this investigation is to determine at what age the heat loss decrements occur and to examine if aerobic fitness level can affect the heat loss capacity in neutral environmental conditions.

Conditions

Risk of Heat Stress

Keywords

heat loss; aging; aerobic fitness level; heat stress

Outcome Measures

Primary Outcomes (8)

• Aerobic fitness level

  Aerobic fitness level was defined by peak oxygen uptake (VO2peak). VO2peak was determined by a 20m shuttle run test. The number of the last announced stage and the equivalent maximal speed from participants' performance were used for its VO2peak estimation

  Through study completion (a shuttle run test), an average of 15 minutes

• Change from baseline ear canal temperature

  Ear canal temperature was recorded twice, at baseline and at the end of the shuttle run test (three times each at the left ear and recorded the mean value), using ear thermometer (IR100, MicrolifeSwitzerland)

  Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes

• Change from baseline axillary temperature

  Axillary temperature was recorded twice, at baseline and at the end of the shuttle run test, using the electronic digital thermometer (EcoTemp, OMRON, Japan)

  Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes

• Physical activity levels

  Physical activity of the subject in a usual week was recorded via International Physical Activity Questionnaire. Scores include steps/day and METs/week, with no lower and upper limit

  Once before the shuttle run test

• Change from baseline body weight

  Weight was recorded twice, at baseline and at the end of the shuttle run test, using a precision weight scale (Kern DE 150K2D, KERN \& SOHN GmbH, Balingen, Germany

  Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes

• Change from baseline whole Body Sweat Rate

  Whole Body Sweat Rate was determined by the difference of the pre-test and post-test weight of the participants

  Change from baseline to the end of study completion (a shuttle run test), an average of 15 minutes

• Air temperature

  Air temperature was measured continuously using a portable weather station (LCD Digital Temperature \& Humidity Meter HTC-1placed) 1 meter above the ground according to the manufacturer's guidelines

  Up to 30 minutes, during a one complete shuttle run test

• Relative humidity

  Relative humidity was measured continuously using a portable weather station (LCD Digital Temperature \& Humidity Meter HTC-1) placed 1 meter above the ground according to the manufacturer's guidelines

  Up to 30 minutes, during a one complete shuttle run test

Study Arms (1)

Shuttle run test

EXPERIMENTAL

At the shuttle run test, participants were required to run between two lines 20 meters apart, while keeping pace with audio signals emitted from a pre-recorded CD. The frequency of the sound signals increases in such way that running speed was increased by 0.5 km h-1 each minute from the starting speed 8.5 km h-1.

Behavioral: Shuttle run test

Interventions

Shuttle run test BEHAVIORAL

At the shuttle run test, participants were required to run between two lines 20 meters apart, while keeping pace with audio signals emitted from a pre-recorded CD. The frequency of the sound signals increases in such way that running speed was increased by 0.5 km h-1 each minute from the starting speed 8.5 km h-1.

Shuttle run test

Eligibility Criteria

• Age: 9 Years - 60 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64)

You may qualify if:

• Healthy children and adults

You may not qualify if:

• Diagnosed chronic medical condition;
• Symptoms of acute illness;
• Recent (past 4 weeks) usage of medications known to affect the circulatory system, the thyroid, the pituitary function, or the metabolic status

Sponsors & Collaborators

• Petros Dinas: lead

Study Sites (2)

Department of Exercise Science, University of Thessaly

Trikala, Thessaly, 42100, Greece

Location

FAME Lab, Department of Exercise Science, University of Thessaly

Trikala, Thessaly, 42100, Greece

Location

MeSH Terms

Conditions

Heat Stress Disorders

Condition Hierarchy (Ancestors)

Wounds and Injuries

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: PREVENTION
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: SPONSOR INVESTIGATOR
• PI Title: Senior Researcher in human physiology

Study Record Dates

• First Submitted: January 16, 2020
• First Posted: January 27, 2020
• Study Start: May 1, 2014
• Primary Completion: October 30, 2018
• Study Completion: October 30, 2018
• Last Updated: January 27, 2020

Record last verified: 2020-01

Locations

GR (2)