Efficacy of Field Treatments to Reduce Body Core Temperature in Hyperthermic Subjects

• Autores: Wade H. Sinclair, Stephan Rudzki, Anthony S. Leicht, Alison L. Fogarty, Susan K. Winter
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 41, Nº. 11, 2009, págs. 1984-1990
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Purpose: To contrast the effects of three postcooling techniques in reducing body core temperature (Tc) in exercise-induced hyperthermic participants on the cessation of exercise.

    Methods: Eleven healthy active male volunteers were cooled during a 40-min period using three different methods: ice packs to the neck, axillae, and groin (ICE); water spray and fan (FAN); and 2 L of chilled (20[degrees]C) intravenous saline administered during a 20-min period (IV). Rate of decrease in Tc, cardiovascular responses, and any incidence of reported adverse effects were investigated. Trials were presented in a counterbalanced order with the volunteers' body core temperature being elevated to 40.0[degrees]C on three occasions via an intermittent walk-run (2 min at 6 km[middle dot]h-1 and 4 min at 10 km[middle dot]h-1) protocol conducted within a climate-controlled chamber (34.2 +/- 0.5[degrees]C and 62.3 +/- 3.1% relative humidity).

    Results: Rate of Tc reduction during the first 20 min of ooling was greater for FAN compared with ICE (0.09 +/- 0.02[degrees]C[middle dot]min-1 vs 0.07 +/- 0.02[degrees]C[middle dot]min-1, P < 0.05), whereas IV did not differ with the other trials (0.08 +/- 0.01[degrees]C[middle dot]min-1, P > 0.05). Three participants complained of numbness or paresthesia in their arm or hand during administration of the chilled saline, although these symptoms resolved within 5 min of ceasing the infusion.

    Conclusions: All three cooling techniques reduced Tc and would be suitable for first aid application in a field setting during transportation to adequate medical facilities. Chilled IV saline did not produce any contraindications, providing a suitable alternative for Tc cooling