Efecto de la suplementación de creatina sobre marcadores de daño muscular y desempeño físico en atletas de voleibo

Given creatine supplementation may attenuate exer-cise-induced damage and directly influence the ATP-CP system, the purpose of the study is to assess the effects of creatine (Cr) supplementation on muscle damage markers; creatine kinase (CK) and lactate dehydrogena-se (LDH), late-onset muscle pain (DOMS) and physical performance in volleyball athletes. A controlled study with a double blind model was performed. Fourteen participants supplemented (0.3 g / kg) of creatine or placebo during (loading phase) and (0.1 g / kg) during (maintenance phase). Significant differences were ob-served in total plasma creatine concentration (p <0.05), body weight (p = 0.047) and lower pain perception (p = 0.020), 24 hours (p = 0.001), 48 hours (p <0.001) and 72 hours (p = 0.011) in the creatine group. The evaluation of subjective perception of pain verified a significant difference in the creatine group (p <0.05). It was con-cluded that creatine supplementation, associated with carbohydrate consumption, attenuated the perception of pain in volleyball players after the muscle damage protocol.Dado que la suplementación con creatina puede atenuar el daño inducido por el ejercicio e influir directamente en el sistema ATP-CP, el propósito del estudio es evaluar los efectos de la suplementación con creatina (Cr) sobre los marcadores de daño muscular como; creatina quinasa (CK) y lactato deshidrogenasa (LDH), dolor muscular de aparición tardía (DOMS) y rendimiento físico en atletas de voleibol. Se realizó un estudio controlado con modelo doble ciego. Catorce participantes suplementaron (0.3 g / kg) de creatina o placebo durante (fase de carga) y (0.1 g / kg) durante (fase de mantenimiento). Diferencias significativas fueron observadas en la concentración plasmática total de creatina (p <0.05), peso corporal (p = 0.047) y menor percepción del dolor (p = 0.020), 24 horas (p = 0.001), 48 horas (p <0.001 ) y 72 horas (p = 0.011) en el grupo creatina. La evaluación de la percepción subjetiva del dolor verificó diferencia significativa en el grupo creatina (p <0.05). Se concluyó que la suplementación de creatina, asociada al consumo de carbohidratos atenuó la percepción de dolor en los jugadores de voleibol después del protocolo de daño muscular.Actividad Física y Deport

Análise de parâmetros nutricionais e metabólicos de jogadores de futebol suplementados com suco de laranja

Soccer is the most popular sport in the world and is performed by men and women with different levels of expertise. Several factors are associated to a good performance in soccer, including the duration and intensity of the effort, the nature of the stimulus, the level of physical training and the nutritional status of the individual. During the exercise is required that muscle glycogen stay at appropriate concentrations, because the depletion of their stores leads to muscle fatigue; Micronutrients are also important for ensuring a good performance in sport. The orange juice is a food known for carbohydrate content, high vitamin C content, and appreciable amounts of other essential nutrients, including carotenoids, folate and potassium; it is also a source of flavonoids hesperidin and narirutin, which have functional properties. In this context, it is believed that supplementation with orange juice in athletes may represent a source of energy, micronutrients and flavonoids, helpful to improve the nutritional status and consequently the physical performance. A research about the effects of orange juice supplementation, associated to the practice of soccer would be relevant to investigate the influence of the juice components on the diet adequacy, on metabolic mechanisms that may reflect on body composition and biochemical parameters associated to health status and physical performance of athletes.O futebol é o esporte mais popular do mundo e é praticado por homens e mulheres com diferentes níveis de especialização. Vários fatores estão relacionados a um bom desempenho no futebol, dentre eles a duração e intensidade do esforço, a natureza do estímulo, o grau de treinamento físico e o estado nutricional do indivíduo. Durante o exercício é necessário que o glicogênio muscular esteja em concentrações adequadas, pois a depleção de seus estoques leva à fadiga muscular; Os micronutrientes também são importantes para a garantia de um bom desempenho no esporte. O suco de laranja é um alimento conhecido pelo teor de carboidratos, elevado conteúdo de vitamina C, e apreciáveis quantidades de outros nutrientes essenciais, incluindo carotenoides, folato e potássio; também é fonte dos flavonoides hesperidina e narirutina, que possuem propriedades funcionais. Neste contexto, acredita-se que a suplementação com suco de laranja em atletas pode representar uma fonte de energia, micronutrientes e flavonoides, útil na melhoria do estado nutricional e, consequentemente do desempenho físico. Um estudo sobre os efeitos da suplementação com suco de laranja associada à pratica do futebol, seria relevante para investigar a influência dos componentes do suco sobre a adequação da dieta, sobre mecanismos metabólicos que podem refletir na composição corporal e sobre os parâmetros bioquímicos associados ao estado de saúde e desempenho físico dos atletas.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Effect of creatine supplementation on muscle damage markers and physical performance in volleyball athletes

Given that creatine supplementation may attenuate exercise-induced damage and directly influence the ATP-CP system, predominant in volleyball, the purpose of the study is to evaluate the effects of creatine (Cr) supplementation on muscle damage markers; creatine kinase (CK) and lactate dehydrogenase (LDH), delayed onset muscle soreness (DOMS) and physical performance in volleyball athletes.Fourteen volleyball players (under- 20 y) were divided into 2 groups: Creatine supplemented and Placebo. Double-blind controlled supplementation was performed using (0.3 g/kg) creatine or placebo for 7 days (loading phase) and (0.1 g/kg) for the next 4 days (maintenance phase). Before and after the supplementation phases, the players underwent Physical Performance Testing and blood sample collection to evaluate CK, LDH, and plasma creatine concentration.Dado que la suplementación con creatina puede atenuar el daño inducido por el ejercicio e influir directamente en el sistema ATP-CP, predominante en el voleibol, el propósito del estudio es evaluar los efectos de la suplementación con creatina (Cr) sobre los marcadores de daño muscular como creatina quinasa (CK) y lactato deshidrogenasa (LDH), dolor muscular de aparición tardía (DOMS) y rendimiento físico en atletas de voleibol. Se realizó un estudio controlado con modelo doble ciego, en el que catorce jugadores de voleibol (menores de 20 años) se dividieron en 2 grupos: creatina y placebo donde suplementaban (0.3 g/kg) de creatina o placebo durante 7 días (fase de carga) y 0.1 g/kg) durante los siguientes 4 días (fase de mantenimiento). Antes y después de cada fase de suplementación, los jugadores se sometieron a pruebas de rendimiento físico y recolección de muestras de sangre para evaluar CK, LDH y la concentración de creatina en plasma

Effects of taurine supplementation in elite swimmers performance

<div><p>Abstract AIM Taurine is considered a semi-essential amino acid characterized by having various physiological functions in the body that modulate mechanisms of action involved in the muscle contraction process, increased energy expenditure, insulin signaling pathway, carbohydrate metabolism, and scavenging free radicals. These functions are crucial for aerobic exercise performance; thus, taurine supplementation may benefit athletes’ performance. The objective of this study was to evaluate the effects of taurine supplementation on the resting energy expenditure and physical performance of swimming athletes. METHODS In a double-blind study, 14 male swimmers were randomized into two groups: the taurine group (n = 7) and the placebo group (n = 7), which received 3 g per day of taurine or placebo in capsules during 8 weeks. Resting energy expenditure, plasma taurine, physical performance, anthropometry, dietary consumption were measured and an incremental test was performed to determine their maximal front crawl swimming performances before and after the 8-week period. RESULTS The levels of serum taurine (p < 0.0001) and lactate (p = 0.0130) showed a significant increase in the taurine group; however, the other variables were not different. No changes were observed in the resting energy expenditure, mean speed performed, and the anaerobic threshold of the swimmers post-supplementation period. CONCLUSION Supplementation of taurine increased plasma concentrations of this amino acid, but did not lead to significant changes in food intake, rest energy expenditure, and athletes’ performance. However, the supplemented group presented a higher lactate production, suggesting a possible positive effect of taurine on the anaerobic lactic metabolism.</p></div