Acute effects of isolated and combined dietary nitrate and caffeine ingestion on ergometer-based 1000 m time trial performance in highly trained kayakers
Pollex J, Behrens M, Mittlmeier T, Bruhn S, Weippert M
Journal of the International Society of Sports Nutrition · 0 citas
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
- Consumo medido con
- No se indica
Quién lo pagó
- Financiación
- Financiación independiente
Según la declaración de financiación del texto completo.
Publicación
- Publicado
- 2025-02-18 · J Int Soc Sports Nutr · vol. 22 · número 1 · pág. 2459095
- Editorial
- Springer Science+Business Media
- Citado
- 1 cita · más que el 70% de estudios similares · 0.9× el promedio de su campo
- Referencias
- 110 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY-NC
- Áreas de investigación
- Sports Performance and Training · Coffee research and impacts · Cardiovascular and exercise physiology
- Palabras clave
- dietary nitrate, beetroot, caffeine, combination supplementation, time trial performance, kayak ergometer, highly trained athletes, muscle oxygenation, muscle activity, fatigue perception, exercise-induced pain, oxygen consumption, cardiopulmonary function, stroke frequency, output power, ergogenic aids, near-infrared spectroscopy, electromyography, heart rate variability
- MeSH
- muscle, skeletal, humans, nitrates, caffeine, prospective studies, cross-over studies, double-blind method, ergometry, oxygen consumption, heart rate, dietary supplements, adult, male, athletic performance, young adult, performance-enhancing substances, sports nutritional physiological phenomena, water sports
5 autores
- Johannes Pollex🇩🇪 · autor de correspondenciaUniversity of Rostock
- Martin Behrens🇩🇪Universitätsmedizin Rostock
- Thomas Mittlmeier🇩🇪Universitätsmedizin Rostock
- Sven Bruhn🇩🇪University of Rostock
- Matthias Weippert🇩🇪University of Rostock
Resumen
El texto original del estudio, en el idioma en que se publicó.
Background
Dietary nitrate (BR) and caffeine (CAF) ingestion have been shown to increase sports performance. However, the isolated and combined effects of BR and CAF ingestion on time trial (TT) performance as well as the accompanying physiological and perceptual responses have never been investigated in highly trained kayak athletes. Therefore, the present study examined the impact of an isolated and combined supplementation with BR (140 ml beetroot concentrate, ~12.5 mmol nitrate) and CAF (3 mg/kg bodyweight) on 1000 m ergometer TT performance as well as the accompanying physiological (i.e. cardiorespiratory function, muscle oxygenation, muscle activity) and perceptual responses (i.e. fatigue, effort, and exercise-induced pain perception) in male highly trained kayakers. It was hypothesized that the isolated ingestion of BR and CAF would both improve ergometer-based 1000 m TT performance and induce supplement-specific physiological and perceptual responses. Considering the primary effects of BR on muscle function and of CAF on the central nervous system, it was further assumed that the combined ingestion will result in an additional performance increase and supplement-specific physiological and perceptual responses.
Methods
Using a prospective, randomized, controlled, double-blind crossover design, 12 male highly trained kayak athletes from local clubs were investigated. They completed four measurement sessions resulting in four randomized conditions: (i) BR+CAF; (ii) BR+CAF placebo (BR+PLA); (iii) CAF+BR placebo (CAF+PLA); and (iv) BR placebo + CAF placebo (PLA+PLA). An air-braked instrumented kayak-ergometer was used to record 1000 m TT performance, power output, and stroke frequency. Heart rate (HR), oxygen uptake (VO2), maximum VO2 (VO2max), respiratory equivalent of O2 (VE/VO2), and carbon dioxide (VE/VCO2) were measured continuously. Furthermore, oxygenation of the deltoid muscle was measured with near-infrared spectroscopy (mNIRS) and muscle activity of nine unilateral muscles with surface electromyography (i.e. deltoideus, serratus anterior, triceps brachii caput lateralis, trapezius, infraspinatus, latissimus dorsi, obliquus externus, flexor carpi radialis, and vastus lateralis muscle) during the 1000 m TT. After the TT, fatigue, effort, and exercise-induced pain perception were queried. One- and two-way analysis of variance with repeated measures were conducted to determine differences between conditions for the entire 1000 m TT and predefined sections (0-50 m, 50-100 m, 100-150 m, 150-250 m, 250-500 m, 500-750 m, 750-1000 m), respectively (p ≤ 0.05).
Results
The supplements did not have an ergogenic effect on TT performance compared to the PLA+PLA condition, either in isolation or in combination. The same applied to the majority of physiological parameters and the perceptual responses. Nevertheless, VE/VO2 was lower during the sections 150-250 m (-5.00%; p = 0.02) and 250-500 m (-3.49%; p = 0.03) in the BR+PLA condition, whereby VE/VCO2 was higher during the section 150-250 m (4.19%; p = 0.04) in the CAF+PLA compared to the PLA+PLA condition, respectively.
Conclusions
Data indicate that the isolated and combined ingestion of BR and CAF had no effect on 1000 m TT performance, the majority of physiological responses, and perceptual responses in highly trained kayakers. These findings might be related to the dosage and/or a ceiling effect due to the already efficient vascular, metabolic, and muscle function, including high amounts of endogenous produced nitric oxide, in athletes.
Resumen vía Europe PMC. Los derechos de autor siguen siendo de los autores o la editorial (CC BY-NC).
Confianza de la comunidad
Cargando…
¿Cuánto confías en los hallazgos de este estudio?
Comentarios
¿Algo está mal aquí?
Señala este estudio si su información, etiquetas o financiación parecen incorrectas. Un editor revisa cada señalamiento.
Información educativa sobre investigación publicada. No es consejo médico ni una recomendación para empezar o dejar nada.