No thermoregulatory or ergogenic effect of dietary nitrate among physically inactive males, exercising above gas exchange threshold in hot and dry conditions
Fowler R, Jeffries O, Tallent J, Theis N, Heffernan SM, McNarry MA, Kilduff L, Waldron M
European journal of sport science · 9 citas
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Quién lo pagó
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Publicación
- Publicado
- 2020-03-04 · Eur J Sport Sci · vol. 21 · número 3 · págs. 370–378
- Editorial
- Taylor & Francis
- Citado
- 10 citas · más que el 62% de estudios similares · 0.5× el promedio de su campo
- Referencias
- 37 trabajos
- Acceso
- Acceso abierto (copia en repositorio)
- Áreas de investigación
- Thermoregulation and physiological responses · Cardiovascular and exercise physiology · Exercise and Physiological Responses
- Palabras clave
- dietary nitrate, beetroot juice, thermoregulation, exercise tolerance, heat stress, hot and dry conditions, nitrite, plasma nitrate, heat balance, sweating, mean arterial pressure, cycling
- MeSH
- humans, beta vulgaris, nitrates, nitrites, pulmonary gas exchange, body temperature, exercise, calorimetry, cross-over studies, double-blind method, humidity, body temperature regulation, sweating, skin temperature, heart rate, exercise tolerance, time factors, adult, male, hot temperature, performance-enhancing substances, fruit and vegetable juices, sedentary behavior
8 autores
- Rebecca C. Fowler
- Owen Jeffries🇬🇧Newcastle University
- Jamie Tallent
- Nicola Theis🇬🇧University of Gloucestershire
- Shane M. Heffernan🇬🇧Swansea University
- Melitta Anne McNarry🇬🇧Swansea University
- Liam Patrick Kilduff🇬🇧Swansea University
- Mark Waldron🇬🇧🇦🇺 · autor de correspondenciaSwansea University; University of New England
Resumen
El texto original del estudio, en el idioma en que se publicó.
The aim of this study was to determine the effect of five days dietary nitrate (NO3-) consumption on exercise tolerance and thermoregulation during cycling in hot, dry conditions. In a double-blind, randomised crossover design, 11 healthy males participated in an exercise tolerance test (Tlim) in the heat (35°C, 28% relative humidity), cycling above the thermoneutral gas exchange threshold, after five days of dietary supplementation, with either NO3-rich beetroot juice (BR; ∼ 9.2 mmol NO3-) or placebo (PLA). Changes in plasma [NO3-] and nitrite [NO2-], core and mean skin temperatures, mean local and whole-body sweat rates, heart rate, perceptual ratings and pulmonary gas exchange were measured during exercise, alongside calorimetric estimations of thermal balance. Mean arterial pressures (MAP) were recorded pre-Tlim. There were no differences in Tlim between conditions (BR = 22.8 ± 8.1 min; Placebo = 20.7 ± 7.9 min) (P = 0.184), despite increases in plasma [NO3-] and [NO2-] (P P = 0.004) in the BR condition. There were no other differences in thermoregulatory, cardio-metabolic, perceptual or calorimetric responses to the Tlim between conditions (P > 0.05). Dietary NO3- supplementation had no effect on exercise tolerance or thermoregulation in hot, dry conditions, despite reductions in resting MAP and increases in plasma [NO3-] and [NO2-]. Healthy, yet physically inactive individuals with no known impairments in vasodilatory and sudomotor function do not appear to require BR for ergogenic or thermolytic effects during exercise in the heat.
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