Introducción

El objetivo de este estudio fue determinar los efectos de la ingestión de carbohidratos (CHO) y el contenido de glucógeno muscular, sin la influencia del conocimiento del consumo de CHO, sobre el rendimiento físico en los Sprint.

Método

Diez hombres entrenados, se sometieron a dos tipos de pruebas, en dos días diferentes. En el día 1 hicieron 2 series de 40 minutos de pedaleo en bici, seguido de 15 m de pedaleo con brazo en maquina tipo Kranking. Tuvieron dos tipos de dieta, una dieta alta en CHO (HCHO; 7 g/kg peso corporal) y otra baja (LCHO; 2 g/kg bw). El día 2 incluyerón una sesión de 60 minutos de ejercicio intermitente-Sprint (ISE) que consistió en 15 metros de sprint, cada minuto. Se hicieron biopsias musculares pre y post de las pruebas ISE del dia 2. Se examinó antes y después del ejercicio la contración máxima voluntaria (MVT), la activación voluntaria (VA) y las propiedades contráctiles fueron evaluadas durante las 15 contracciones isométricas máximas. También se obtuvieron el de la glucosa en sangre y el lactato, la frecuencia cardíaca (FC) y el índice de esfuerzo percibido (RPE) .

Resultados

El glucógeno muscular fué mayor en el Pre-ISE con HCHO en comparción con LCHO (597 ± 115 vs. 318 ± 72 mmol kg de peso en seco; P = 0,001). La distancia total y la distancia de recorrida fue mayor HCHO en comparaciín con LCHO  4,9 y un 8,1% mayor, respectivamente (p = 0,02-0,04). El pico MVT, VA, HR y el RPE no fueron diferentes entre los dos protocolos de hidratos de carbono (CHO) [P> 0,05]. La glucosa en sangre fue mayor pre-ISE en LCHO pero más baja después de la ISE en comparación con HCHO (P <0,05).

Conclusión

Estos resultados indican que una dieta alta en Hidratos de carbono HCHO mejora las intensidades del ejercicio durante el protocolo de Sprint (ISE). Debido al diseño del estudio, las intensidades del ejercicio parecen estar manipuladas ante perturbaciones periféricas asociadas con el contenido de CHO en vez de una consciente manipulación de las intensidades de ejercicio.

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