Study to Warm Up and Cool Down Recreationally Active Males Using Different Protocols.

NCT06874023 | Completed

• 1 other identifier: STUDY00015072
• Study Type: interventional
• Target: 10
• Locations: 1 country
• Sites: 1

Brief Summary

The objective of this study was to examine the impact of four single-bout heating and cooling strategies on warming up and cooling down core body temperature. Heating strategies included: Passive heating in a hot environment (60 min), Active heating (30 min) + passive heating (30 min) in a hot environment, Active heating(60 min) in a hot environment, and Active heating (60 min) at room temperature. Cooling strategies to reduce body core temperature to baseline included: Cool vest (18°C) , Damp neck towel (24°C) combined with arm (i.e. hand, forearm and half of upper arm) cool water immersion (15°C), Combination of both, A control with participant sitting in a thermoneutral room (20°C air temperature) without any additional cooling intervention.

Conditions

Heat Acclimation and Thermotolerance

Keywords

Heat; Adaptation; Passive heating

Outcome Measures

Primary Outcomes (1)

• Body core temperature

  A portable telemetry system (E-Celsius, BodyCAP, Hérouville Saint-Clair, France) for temperature sensor capsule, with an accuracy of +/- 0.2°C, was used to measure body core temperature.

  During 60 minute of heating intervention, followed by 60 minutes of cooling intervention.

Secondary Outcomes (2)

• Skin temperature

  During 60 minute of heating intervention, followed by 60 minutes of cooling intervention.

• Heart rate

  During 60 minute of heating intervention, followed by 60 minutes of cooling intervention.

Other Outcomes (4)

• Sweat rate

  Covering the 60 min of heating and 60 min of cooling resulting in an average sweat rate per hour.

• Urine specific gravity

  Pre (within 30 min before heating) and post heating (within 5 min after finishing heating) and cooling interventions (within 5 min after finishing cooling).

• Environmental temperature

  Continuous measurements during the 60 minute heating intervention, followed by the total duration of cooling to baseline intervention for a maximum of 60 minutes.

Study Arms (1)

Healthy young men exposed to heating and cooling protocols

OTHER

All participants underwent four times a heating protocol separated by at least one week, and during these days after undergoing the heating protocol they also participated in a protocol aiming to cool down their body temperature. Each of the four heating and cooling interventions are described as interventions.

Other: Passive heating in hot conditions; Other: Active heating + passive heating in hot conditions; Other: Active heating in hot conditions; Other: Active heating at room temperature; Other: Cool vest; Other: Damp neck towel combined with arm cool water immersion; Other: Combination of cooling interventions; Other: Control in thermoneutral room without cooling

Interventions

Passive heating in hot conditions OTHER

Participants performed seated passive heating in 54C conditions

Healthy young men exposed to heating and cooling protocols

Active heating + passive heating in hot conditions OTHER

Participants performed 30 minutes of biking exercise in 43C + 30 min of passive seated heating in 54C conditions.

Healthy young men exposed to heating and cooling protocols

Active heating in hot conditions OTHER

Participants performed 60 minutes of biking exercise in 43C.

Healthy young men exposed to heating and cooling protocols

Active heating at room temperature OTHER

Participants performed active heating through biking exercise for 60 minutes at room temperature.

Healthy young men exposed to heating and cooling protocols

Cool vest OTHER

Cool vest (18°C) with 500 mL (16 fl oz) ice water consumption

Healthy young men exposed to heating and cooling protocols

Damp neck towel combined with arm cool water immersion OTHER

Damp neck towel (24°C) combined with arm (i.e. hand, forearm and half of upper arm) cool water immersion (15°C) and 500 mL (16 fl oz) ice water consumption

Healthy young men exposed to heating and cooling protocols

Combination of cooling interventions OTHER

Combination of cool vest (18°C), damp neck towel (24°C) with arm cool water immersion (15°C), and 500 mL (16 fl oz) ice water consumption

Healthy young men exposed to heating and cooling protocols

Control in thermoneutral room without cooling OTHER

A control with participant sitting in a thermoneutral room (20°C air temperature) without any additional cooling intervention.

Healthy young men exposed to heating and cooling protocols

Eligibility Criteria

• Age: 18 Years - 30 Years
• Sex: male
• Healthy Volunteers: No
• Age Groups: Adult (18-64)

You may qualify if:

• self-reported healthy
• non-smoking
• uninjured
• active (training five to ten hours per week)

You may not qualify if:

• Participants were screened for fitness using the Physical Activity Readiness Questionnaire (PAR-Q): scoring one or more items as a yes.
• Contraindications to use a body core temperature sensor capsule.

Sponsors & Collaborators

• Arizona State University: lead

Study Sites (1)

Community Services Building

Tempe, Arizona, 85004, United States

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: OTHER
• Intervention Model: SEQUENTIAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Assistant Professor

Model Details: Participants performed 4 arms in non-random order (i.e. passive heating, exercise in the heat + passive heating, exercise in the heat, exercise at room temperature), followed by randomized cooling interventions (i.e. a cool slush and one of the three cooling treatments: 1) cool vest, 2) lower arm cool water immersion with cold towel in the neck, 3) combination of 1+2) or heaving no cooling intervention at room temperature with thermoneutral water only).

Study Record Dates

• First Submitted: March 5, 2025
• First Posted: March 13, 2025
• Study Start: September 14, 2020
• Primary Completion: October 23, 2020
• Study Completion: October 23, 2020
• Last Updated: March 13, 2025

Record last verified: 2025-03

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)