Interactive effects of age and hydration state on human thermoregulatory function during exercise in hot-dry conditions
Meade RD, Notley SR, D'Souza AW, Dervis S, Boulay P, Sigal RJ, Kenny GP
Acta physiologica (Oxford, England) · 12 citas
Cómo se estudió
- Diseño
- Ensayo clínico controlado (clasificado por nuestro filtro de IA)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
- Gobierno
- Government of Ontario
- Gobierno
- Alberta Innovates - Health Solutions
- Gobierno
- Natural Sciences and Engineering Research Council of Canada
- Gobierno
- Queen Elizabeth II Graduate Scholarship in Science and Technology
- Gobierno
- Alberta Innovates-Health Solutions
- Universidad u hospital
- University of Ottawa Research Chair
- Universidad u hospital
- Human and Environmental Physiology Research Unit
Según 7 financiadores declarados.
Publicación
- Publicado
- 2018-11-27 · Acta Physiol (Oxf) · vol. 226 · número 1 · pág. e13226
- Editorial
- Wiley
- Citado
- 22 citas · más que el 76% de estudios similares · 1.0× el promedio de su campo
- Referencias
- 47 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Exercise and Physiological Responses · Body Composition Measurement Techniques
- Palabras clave
- Thermoregulation, Relative humidity, Medicine, Chemistry, Ageing, Animal science, Internal medicine, Thermodynamics
- MeSH
- humans, exercise, humidity, body temperature regulation, aging, heart rate, adult, middle aged, male, hot temperature, young adult, organism hydration status
7 autores
- Robert D. Meade🇨🇦University of Ottawa
- Sean R. Notley🇨🇦University of Ottawa
- Andrew W. D’Souza🇨🇦University of Ottawa
- Sheila Dervis🇨🇦University of Ottawa
- Pierre Boulay🇨🇦Université de Sherbrooke
- Ronald J. Sigal🇨🇦University of Ottawa; University of Calgary; Ottawa Hospital; Ottawa Hospital Research Institute
- Glen Patrick Kenny🇨🇦 · autor de correspondenciaUniversity of Ottawa; Ottawa Hospital; Ottawa Hospital Research Institute
Resumen
El texto original del estudio, en el idioma en que se publicó.
Aim
Ageing and hypohydration independently attenuate heat dissipation during exercise; however, the interactive effects of these factors remain unclear. We assessed the hypothesis that ageing suppresses hypohydration-induced reductions in whole-body heat loss during exercise in the heat.
Methods
On two occasions, eight young (mean [SD]: 24 [4] years) and eight middle-aged (59 [5] years) men performed 30-minute bouts of light (heat production of 175 W m-2 ) and moderate (275 W m-2 ) cycling (separated by 15-minute rest) in the heat (40°C, 15% relative humidity) when euhydrated and hypohydrated (~4% reduction in body mass). Heat production and whole-body net heat exchange (evaporative heat loss + dry heat gain) were measured via indirect and direct calorimetry (respectively) and heat storage was calculated via their temporal summation.
Results
Net heat exchange was reduced, while heat storage was elevated, in the middle-aged men during moderate exercise when euhydrated (both P ≤ 0.01). In the young, evaporative heat loss was attenuated in the hypohydrated vs euhydrated condition during light (199 ± 6 vs 211 ± 10 W m-2 ; P ≤ 0.01) and moderate (287 ± 15 vs 307 ± 13 W m-2 ; P ≤ 0.01) exercise, but was similar in the middle-aged men, averaging 223 ± 6 and 299 ± 15 W m-2 , respectively, across conditions (both P ≥ 0.32). Heat storage was thereby exacerbated by hypohydration in the young (both P < 0.01) but not the middle-aged (both P ≥ 0.32) during both exercise bouts and, as a result, was similar between groups when hypohydrated (both P ≥ 0.50).
Conclusion
Hypohydration attenuates heat loss via sweating in young but not middle-aged men, indicating that ageing impairs one's ability to mitigate further sweat-induced fluid loss during hypohydration.
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