Acute Beetroot Juice Supplementation Has No Effect on Upper- and Lower-Body Maximal Isokinetic Strength and Muscular Endurance in International-Level Male Gymnasts.
Int J Sport Nutr Exerc Metab
; 34(3): 164-171, 2024 May 01.
Article
em En
| MEDLINE
| ID: mdl-38237581
ABSTRACT
Nitrate (NO3-) has properties that can improve muscle function, leading to improvements in metabolic cost of exercise as well as enhance force production. Gymnastics is a whole-body sport, involving events that demand a high level of strength and fatigue resistance. However, the effect of NO3- supplementation on both upper- and lower-body function in gymnasts is unknown. This study examined the effect of acute beetroot juice (BRJ) supplementation on isokinetic strength and endurance of the upper- and lower-body in highly trained international-level male gymnasts. In a double-blind, randomized crossover design, 10 international-level male gymnasts completed two acute supplementation periods, consuming either 2 × 70 ml NO3--rich (â¼12.8 mmol/L of NO3-) or NO3--depleted (PLA) BRJ. Maximal strength of the upper-leg and upper-arm at 60°/s, 120°/s, 180°/s, and 300°/s, and muscular endurance (50 repeated isokinetic contractions at 180°/s) were assessed. Plasma NO3- (BRJ 663 ± 164 µM, PLA 89 ± 48 µM) and nitrite (NO2-) concentrations (BRJ 410 ± 137 nmol/L, PLA 125 ± 36 nmol/L) were elevated following BRJ compared to PLA (both p < .001). Maximal strength of knee and elbow extensors and flexors did not differ between supplements (p > .05 for all velocities). Similarly, fatigue index of knee and elbow extension and flexion was not different between supplements (all p > .05). Acute BRJ supplementation, containing â¼12.8 mmol/L of NO3-, increased plasma NO3- and NO2- concentrations, but did not enhance isokinetic strength or fatigue resistance of either upper or lower extremities in international-level male gymnasts.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Beta vulgaris
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Desempenho Atlético
Tipo de estudo:
Clinical_trials
Limite:
Humans
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Male
Idioma:
En
Revista:
Int J Sport Nutr Exerc Metab
Assunto da revista:
CIENCIAS DA NUTRICAO
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MEDICINA ESPORTIVA
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METABOLISMO
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Reino Unido