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

Arizona State University (ASU)

Status

Completed

Conditions

Heat Acclimation and Thermotolerance

Treatments

Other: Active heating + passive heating in hot conditions

Other: Passive heating in hot conditions

Other: Active heating in hot conditions

Other: Cool vest

Other: Active heating at room temperature

Other: Combination of cooling interventions

Other: Damp neck towel combined with arm cool water immersion

Other: Control in thermoneutral room without cooling

Study type

Interventional

Funder types

Other

Identifiers

NCT06874023

STUDY00015072

Details and patient eligibility

About

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.

Full description

This semi-randomized crossover control trial was performed between September and October 2020. Data collection took place over the course of 5-weeks with 10 subjects, with one data collection session with all subjects per week (hence, 40 trials total). Baseline gastrointestinal temperature (Tgi) was recorded, and the final Tgi at the end of the heating intervention (Part I), was used as the starting temperature for the current study (Part II).

Part I focused on assessing the efficacy of different heating strategies (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), aiming to reach a core temperature of 38.5°C during a 60-minute period.

Part II focused on cooling the body to a pre-exercise baseline core temperature. Cooling strategies consisted of: 1) Cool vest (18°C) with 500 mL (16 fl oz) ice water consumption, 2) 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 3) 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 or 4) A control with participant sitting in a thermoneutral room (20°C air temperature) without any additional cooling intervention. Thermoneutral water was consumed ad libitum for all interventions in addition to the 500 mL (16 fl oz) ice water consumption for experimental trials (#1-3).

Enrollment

10 patients

Sex

Male

Ages

18 to 30 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

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

Exclusion criteria

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.

Trial design

Primary purpose

Other

Allocation

N/A

Interventional model

Sequential Assignment

Masking

None (Open label)

10 participants in 1 patient group

Healthy young men exposed to heating and cooling protocols

Other group

Description:

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.

Treatment: