Influence of hypohydration on intermittent sprint performance in the heat
Maxwell NS, McKenzie RW, Bishop D
International journal of sports physiology and performance · 11 citas
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 independiente
- Gobierno
- Australian Institute of Sport
Según 1 financiador declarado.
Publicación
- Publicado
- 2009-03-01 · Int J Sports Physiol Perform · vol. 4 · número 1 · págs. 54–67
- Editorial
- Human Kinetics
- Citado
- 20 citas · más que el 77% de estudios similares · 1.0× el promedio de su campo
- Referencias
- 31 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Sports Performance and Training · Cardiovascular and exercise physiology
- Palabras clave
- hypohydration, heat stress, peak power, total work, physiological strain index
- MeSH
- humans, dehydration, heat stress disorders, lactic acid, analysis of variance, risk factors, prospective studies, cross-over studies, ergometry, task performance and analysis, exercise tolerance, time factors, bicycling, male, statistics as topic, hot temperature, young adult
3 autores
- Neil Maxwell🇬🇧University of Brighton
- Richard Mackenzie
- David John Bishop🇦🇺The University of Melbourne
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
To examine the effect of hypohydration on physiological strain and intermittent sprint exercise performance in the heat (35.5 +/- 0.6 degrees C, 48.7 +/- 3.4% relative humidity).
Methods
Eight unacclimatized males (age 23.4 +/- 6.2 y, height 1.78 +/- 0.04 m, mass 76.8 +/- 7.7 kg) undertook three trials, each over two days. On day 1, subjects performed 90 min of exercise/heat-induced dehydration on a cycle ergometer, before following one of three rehydration strategies. On day 2, subjects completed a 36-min cycling intermittent sprint test (IST) with a -0.62 +/- 0.74% (euhydrated, EUH), -1.81 (0.99)% (hypohydrated1, HYPO1), or -3.88 +/- 0.89% (hypohydrated2, HYPO2) body mass deficit.
Results
No difference was observed in average total work (EUH, 3790 +/- 556 kJ; HYPO1, 3785 +/- 628 kJ; HYPO2, 3647 +/- 339 kJ, P = 0.418), or average peak power (EUH, 1315 +/- 129 W; HYPO1, 1304 +/- 175 W; HYPO2, 1282 +/- 128 W, P = 0.356) between conditions on day 2. Total work and peak power output in the sprint immediately following an intense repeated sprint bout during the IST were lower in the HYPO2 condition. Physiological strain index was greater in the HYPO2 vs. the EUH condition, but without changes in metabolic markers.
Conclusion
A greater physiological strain was observed with the greatest degree of hypohydration; however, sprint performance only diminished in the most hypohydrated state near the end of the IST, following an intense bout of repeating sprinting.
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