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Related Experiment Videos

Skin temperature feedback optimizes microclimate cooling.

Lou A Stephenson1, Carrie R Vernieuw, Walida Leammukda

  • 1U.S. Army Research Institute of Environmental Medicine, Thermal and Mountain Medicine, Natick, MA 01760, USA.

Aviation, Space, and Environmental Medicine
|May 9, 2007
PubMed
Summary
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A new cooling method using skin temperature feedback (PCskin) effectively managed heat in exercising men wearing protective gear. This approach optimized cooling garment performance and reduced energy use without increasing cardiovascular strain.

Area of Science:

  • Physiology
  • Thermal Regulation
  • Human Performance

Background:

  • Personal protective equipment (PPE) use during exercise in warm environments poses thermal challenges.
  • Novel cooling strategies are needed to mitigate heat strain in physically demanding occupations.
  • Pulsed cooling (PC) paradigms offer potential for improved thermal management compared to constant cooling (CC).

Purpose of the Study:

  • To compare a novel pulsed cooling paradigm integrating mean skin temperature (Tsk) feedback (PCskin) with constant cooling (CC) and time-activated pulsed cooling (PC).
  • To evaluate the efficacy of PCskin in managing thermal load and cardiovascular strain during exercise in PPE.
  • To assess the impact of PCskin on energy expenditure for cooling.

Main Methods:

  • Eight males performed 80-min treadmill exercise in a warm, dry environment (30°C) wearing PPE and a liquid cooling garment (LCG) covering 72% of body surface area.

Related Experiment Videos

  • Measurements included core temperature (Tc), skin temperatures (Tsk), heart rate, LCG perfusate conditions, and electrical power.
  • Three cooling conditions were tested: PCskin, PC, and CC.

    • Main Results:

    • Mean skin temperature (Tsk) at 75 min was highest in PCskin (33.9°C), followed by PC (33.1°C) and CC (32.0°C).
    • No significant differences in core temperature (Tc) or heart rate were observed among the cooling conditions.
    • PCskin reduced electrical power by 46% compared to CC and 28% compared to PC, while significantly reducing total body insulation.

    Conclusions:

    • Real-time Tsk feedback control optimizes liquid cooling garment (LCG) efficacy during exercise in PPE.
    • PCskin reduces electrical power requirements for cooling without compromising cardiovascular strain.
    • This Tsk-feedback-controlled pulsed cooling represents an efficient strategy for thermal management in demanding environments.