Central and peripheral fatigue during passive and exercise-induced hyperthermia
Périard JD, Caillaud C, Thompson MW
Medicine and science in sports and exercise · 42 citas
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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
- 2011-03-02 · Med Sci Sports Exerc · vol. 43 · número 9 · págs. 1657–1665
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 68 citas · más que el 97% de estudios similares · 6.5× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 48 trabajos
- Acceso
- De pago
- Áreas de investigación
- Exercise and Physiological Responses · Thermoregulation and physiological responses · Infrared Thermography in Medicine
- Palabras clave
- Isometric exercise, Hyperthermia, Peripheral, Turnover, Internal medicine, Heat stress, Medicine, Cardiology, Animal science, Biology
- MeSH
- humans, fever, exercise test, exercise, oxygen consumption, heart rate, muscle fatigue, isometric contraction, adult, male, quadriceps muscle, muscle strength
3 autores
- Julien D. Périard🇦🇺🇶🇦The University of Sydney; Qatar Airways (Qatar); Qatar Orthopaedic and Sports Medicine Hospital
- Corinne Caillaud🇦🇺The University of Sydney
- Martin William Thompson🇦🇺The University of Sydney
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
Hyperthermia was induced during prolonged exercise (ExH) and passive heating (PaH) to isolate the influence of exercise on neuromuscular function during a maximal voluntary isometric contraction (MVC) of the quadriceps under heat stress. The influence of cardiovascular strain in limiting endurance performance in the heat was also examined.
Methods
On separate days, eight males cycled to exhaustion at 60% maximal oxygen uptake or were immersed in a water bath (∼41°C) until rectal temperature (Tre) increased to 39.5°C. The ExH and PaH interventions were performed in ambient conditions of 38°C and 60% relative humidity with Tre reaching 39.8°C during exercise. Before (control) and after each intervention, voluntary activation and force production capacity were evaluated by superimposing an electrically stimulated tetanus during a 45-s MVC.
Results
Force production decreased immediately after PaH and ExH compared with control, with the magnitude of decline being more pronounced after ExH (P < 0.01). Mean voluntary activation was also significantly depressed after both interventions (P < 0.01 vs control). However, the extent of decline in voluntary activation was maintained at ∼90% during both PaH and ExH MVC. This decline accounted for 41.5% (PaH) and 33.1% (ExH) of the decrease in force production. In addition, exhaustion coincided with a marked increase in HR (∼96% of maximum) and a decline in stroke volume (25%) and mean arterial pressure (10%) (P < 0.05).
Conclusions
The loss of force production capacity during hyperthermia originated from central and peripheral fatigue factors, with the combination of heat stress and previous contractile activity exacerbating the rate of decline. Thus, the observed significant rise in thermal strain in ExH and PaH impaired neuromuscular function and was associated with an exercise performance limiting increase in cardiovascular strain.
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