Efecto del consumo agudo de cafeína sobre la fuerza máxima y los niveles de lactato en sangre en jóvenes sedentarios: Ensayo clínico aleatorizado
DOI:
https://doi.org/10.22267/rus.161802.37Palavras-chave:
Cafeína, Fuerza muscular, Lactato, EjercicioResumo
Objetivo: Demostrar el efecto de la cafeína en consumo agudo sobre la fuerza máxima y niveles de lactato. Materiales y métodos: Ensayo clínico aleatorizado controlado de grupos paralelos ciego simple. Se seleccionaron 92 sujetos, 43 asignados aleatoriamente al grupo de ingesta de cafeína (1,3 mg/Kg) o control con placebo. Se utilizó el test de 1RM para medir la fuerza máxima y el lactato mediante espectrofotometría antes y después de 1 hora de ingestión de cafeína (1,3 mg/Kg) o placebo. Análisis estadístico con t-student, el cambio porcentual y el tamaño del efecto con d-Cohens, p≤0,05. Resultados: Se produjo mejoría significativa en la fuerza máxima de miembro superior 1RM 8,3±6,0 kg con un tamaño efecto-medio (26,2%; d=0,64; t=-4,36; gl=41; p<0,01; IC:-16,9 a -6,2); y de miembro inferior 1RM 9,2±4,9 kg con un tamaño del efecto medio (25,8%; d=0,51; t=-3,16; gl=41; p<0,01; IC:-17,0 a -3,7). Para los niveles de lactato se observó aumento menor en el grupo experimental 0,96±0,10 mmol/L con un tamaño del efecto pequeño (64,9%; d=0,39; t=10,8; gl=41; p<0,01; IC:0,55 a 0,81). Conclusión: La cafeína en baja dosis produce incremento superior en la fuerza máxima de miembro superior, fuerza máxima de miembro inferior y favorece incremento menor en niveles de lactato.
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