Caffeine improves performance in double poling during acute exposure to 2,000-m altitude
Stadheim HK, Nossum EM, Olsen R, Spencer M, Jensen J
Journal of applied physiology (Bethesda, Md. : 1985) · 25 citas
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- 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
- 2015-10-23 · J Appl Physiol (1985) · vol. 119 · número 12 · págs. 1501–1509
- Editorial
- American Physiological Society
- Citado
- 33 citas · más que el 82% de estudios similares · 1.4× el promedio de su campo
- Referencias
- 44 trabajos
- Acceso
- Acceso abierto (copia en repositorio) · OTHER-OA
- Áreas de investigación
- High Altitude and Hypoxia · Coffee research and impacts · Sports Performance and Training
- Palabras clave
- caffeine, acute hypoxia, double poling, cross-country skiing, exercise performance, time to task failure, rating of perceived exertion, exercise-induced pain, heart rate, blood lactate, epinephrine, hypobaric chamber
- MeSH
- humans, pain, catecholamines, caffeine, central nervous system stimulants, cross-over studies, double-blind method, altitude, oxygen consumption, heart rate, skiing, adult, male, athletic performance, young adult
5 autores
- Hans Kristian Stadheim🇳🇴 · autor de correspondenciaNorwegian School of Sport Sciences
- Eirik Myhr Nossum🇳🇴Norwegian School of Sport Sciences
- Raymond Olsen🇳🇴National Institute of Occupational Health
- M Spencer🇳🇴Norwegian School of Sport Sciences
- J. Jensen🇳🇴Norwegian School of Sport Sciences
Resumen
El texto original del estudio, en el idioma en que se publicó.
There is limited research on the physiological effects of caffeine (CAF) ingestion on exercise performance during acute hypoxia. The aim of the present study was therefore to test the effect of placebo (PLA) and CAF (4.5 mg/kg) on double poling (DP) performance during acute hypoxia. Thirteen male subelite cross-country skiers (V̇o2max 72.6 ± 5.68 ml·kg(-1)·min(-1)) were included. Performance was assessed as 1) an 8-km cross-country DP time-trial (C-PT), and 2) time until task failure at a set workload equal to ∼90% of DP V̇o2max. Testing was carried out in a hypobaric chamber, at 800 mbar (Pio2: ∼125 mmHg) corresponding to ∼2,000 m above sea level in a randomized double-blinded, placebo-controlled, cross-over design. CAF improved time to task failure from 6.10 ± 1.40 to 7.22 ± 1.30 min (P < 0.05) and velocity the first 4 km (P < 0.05) but not overall time usage for the 8-km C-PT. During submaximal exercise subjects reported lower pain in arms and rate of perceived exertion (RPE) following CAF ingestion. Throughout C-PTs similar RPE and pain was shown between treatments. However, higher heart rate was observed during the CAF 8 km (187 ± 7 vs. 185 ± 7; P < 0.05) and 90% C-PT (185 ± 7 vs. 181 ± 9) associated with increased ventilation, blood lactate, glucose, adrenaline, decreased pH, and bicarbonate. The present study demonstrates for the first time that CAF ingestion improves DP time to task failure although not consistently time trial performance during acute exposure to altitude. Mechanisms underpinning improvements seem related to reduced pain RPE and increased heart rate during CAF C-PTs.
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