NCT06874023

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

Warm Up and Cool Down Study: Various Combined Active and Passive Isothermic Heating Protocols, Followed by Different Cooling Protocols, to Increase and Lower Body Core Temperature.

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 10 (actual)
• Sponsor: Arizona State University · Academic / Other
• Sex: Male
• Age: 18 Years – 30 Years
• Healthy volunteers: Not accepted

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.

Detailed 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).

Conditions

• Heat Acclimation and Thermotolerance

Interventions

Type	Name	Description
OTHER	Passive heating in hot conditions	Participants performed seated passive heating in 54C conditions
OTHER	Active heating + passive heating in hot conditions	Participants performed 30 minutes of biking exercise in 43C + 30 min of passive seated heating in 54C conditions.
OTHER	Active heating in hot conditions	Participants performed 60 minutes of biking exercise in 43C.
OTHER	Active heating at room temperature	Participants performed active heating through biking exercise for 60 minutes at room temperature.
OTHER	Cool vest	Cool vest (18°C) with 500 mL (16 fl oz) ice water consumption
OTHER	Damp neck towel combined with arm cool water immersion	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
OTHER	Combination of cooling interventions	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
OTHER	Control in thermoneutral room without cooling	A control with participant sitting in a thermoneutral room (20°C air temperature) without any additional cooling intervention.

Timeline

• Start date: 2020-09-14
• Primary completion: 2020-10-23
• Completion: 2020-10-23
• First posted: 2025-03-13
• Last updated: 2025-03-13

Locations

1 site across 1 country: United States