Two strategies for the acute response to cold exposure but one strategy for the response to heat stress
Brazaitis M, Eimantas N, Daniuseviciute L, Vitkauskiene A, Paulauskas H, Skurvydas A
International journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group · 21 citas
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- Diseño
- Ensayo clínico controlado (clasificado por nuestro filtro de IA)
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Quién lo pagó
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Publicación
- Publicado
- 2015-02-24 · Int J Hyperthermia · vol. 31 · número 4 · págs. 325–335
- Editorial
- Taylor & Francis
- Citado
- 32 citas · más que el 92% de estudios similares · 3.3× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 62 trabajos
- Acceso
- Lectura gratuita
- Áreas de investigación
- Thermoregulation and physiological responses · Exercise and Physiological Responses · Climate Change and Health Impacts
- Palabras clave
- Heat stress, Hyperthermia, Epinephrine, Thermoregulation, Corticosterone, Endocrinology, Internal medicine, Norepinephrine, Cold stress, Hormone, Medicine, Fight-or-flight response, Animal science, Rectal temperature, Chemistry, Biology, Dopamine, Biochemistry
- MeSH
- pituitary-adrenal system, hypothalamo-hypophyseal system, humans, heat stress disorders, body temperature, motor activity, cognition, adaptation, physiological, body temperature regulation, adult, male, cold temperature, stress, physiological, young adult
6 autores
- Marius Brazaitis🇱🇹 · autor de correspondenciaLithuanian Sports University
- Nerijus Eimantas🇱🇹Lithuanian Sports University
- Laura Daniusevičiūtė🇱🇹Kaunas University of Technology
- Astra Vitkauskienė🇱🇹Lithuanian University of Health Sciences
- Henrikas Paulauskas🇱🇹Lithuanian Sports University
- Albertas Skurvydas🇱🇹Lithuanian Sports University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
The main aim of this study was to compare physiological and psychological reactions to heat stress between people who exhibited fast cooling (FC, n = 20) or slow cooling (SC; n = 20) responses to 14 °C cold water immersion.
Methods
Forty healthy young men (19-25 years old) were recruited to this study based on their tolerance to cold exposure (FC versus SC). The heat stress was induced using immersion in bath water at 43-44 °C. Motor and cognitive performance, immune variables, markers of hypothalamic-pituitary-adrenal axis activity (i.e. stress hormone concentrations), and autonomic nervous system activity were monitored.
Results
In the FC group, time to warm the body from a resting rectal temperature (Tre) of 37.1 ± 0.2 °C before warming to 39.5 °C was 63.7 ± 22.4 min. In the SC group, the time to warm the body from a Tre 37.1 ± 0.3 °C before warming to 39.5 °C was 67.2 ± 13.8 min (p > 0.05 between groups). The physiological stress index (PSI) after warming was 8.0 ± 0.6 and 8.2 ± 1.0 in the FC and SC groups, respectively (p > 0.05 between groups). During warming, the changes in subjective indicators of heat stress did not differ significantly between the FC (7.4 ± 0.5) and SC (7.1 ± 1.1) groups, respectively.
Conclusion
The increase in cortisol, epinephrine, norepinephrine, and corticosterone concentrations after passive body heating did not differ between the FC and SC groups. Heat stress did not change indicators of innate and specific immunity in the FC or the SC group. An interesting finding was that heat stress did not affect motor and cognitive function in either group, although central fatigue during 1-min maximal voluntary contraction increased after heat stress in both groups.
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