Warming by immersion or exercise affects initial cooling rate during subsequent cold water immersion
Scott CG, Ducharme MB, Haman F, Kenny GP
Aviation, space, and environmental medicine · 12 citas
Etiquetas de revisión
Financiación no declaradaDatos neutrales que nuestra revisión registró sobre cómo se hizo este estudio. Describen el método, nunca si nos gusta el resultado.
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2004-11-01 · Aviat Space Environ Med · vol. 75 · número 11 · págs. 956–63
- Editorial
- National Institutes of Health
- Citado
- 21 citas · más que el 71% de estudios similares · 0.6× el promedio de su campo
- Referencias
- 0 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Thermal Regulation in Medicine · Cardiovascular and exercise physiology
- Palabras clave
- cold water immersion, core body temperature, passive warming, warm water immersion, hypothermia, heat loss, survival time, esophageal temperature
- MeSH
- esophagus, humans, exercise test, body temperature, rewarming, hypothermia, induced, immersion, oxygen consumption, time factors, adult, male
4 autores
- Chris G Scott🇨🇦University of Ottawa
- Michel B. Ducharme
- François Haman
- Glen Patrick Kenny
Resumen
El texto original del estudio, en el idioma en que se publicó.
Introduction
We examined the effect of prior heating, by exercise and warm-water immersion, on core cooling rates in individuals rendered mildly hypothermic by immersion in cold water.
Methods
There were seven male subjects who were randomly assigned to one of three groups: 1) seated rest for 15 min (control); 2) cycling ergometry for 15 min at 70% Vo2 peak (active warming); or 3) immersion in a circulated bath at 40 degrees C to an esophageal temperature (Tes) similar to that at the end of exercise (passive warming). Subjects were then immersed in 7 degrees C water to a Tes of 34.5 degrees C.
Results
Initial Tes cooling rates (initial approximately 6 min cooling) differed significantly among the treatment conditions (0.074 +/- 0.045, 0.129 +/- 0.076, and 0.348 +/- 0.117 degrees C x min(-1) for control, active, and passive warming conditions, respectively); however, secondary cooling rates (rates following initial approximately 6 min cooling to the end of immersion) were not different between treatments (average of 0.102 +/- 0.085 degrees C x min(-1)). Overall Tes cooling rates during the full immersion period differed significantly and were 0.067 +/- 0.047, 0.085 +/- 0.045, and 0.209 +/- 0.131 degrees C x min(-1) for control, active, and passive warming, respectively.
Discussion
These results suggest that prior warming by both active and, to a greater extent, passive warming, may predispose a person to greater heat loss and to experience a larger decline in core temperature when subsequently exposed to cold water. Thus, functional time and possibly survival time could be reduced when cold water immersion is preceded by whole-body passive warming, and to a lesser degree by active warming.
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