TREINAMENTO DE FORÇA NA HIPERTROFIA MUSCULAR DE RATOS EM DIETA HIPERPROTEICA

Abstract

Strength training (ST) is a training method to obtain muscle hypertrophy and high protein diets (HD)is an aid to increase the hypertrophy process. The aim of this work was to verify the impact of HD on muscle hypertrophy in rats submitted to ST. For this, 18 Wistar rats were divided into 4 groups: NC (normoprotein diet control, n=5), NT (normoprotein diet and training, n=5), HC (hyperprotein diet control, n=4) and HT (hyperprotein diet and training, n=4). The NC and NT groups received the standard AIN-93M diet (with 14% protein) and the HC and HT groups received a high-protein diet (with 26% protein). The NT and HT groups were submitted to ST, three times a week, for 12 weeks, with progressive loads on stairs (50, 75, 90 and 100%) of their maximum capacity. The gastrocnemius was excised to check for cross sectional area (CSA). One-Way ANOVA with Tukey post hoc was used as a statistical procedure, adopting p <0.05 as significance. No differences were observed between the final body weight between trained rats (NT x HT) and between controls (NC x HC). However, the HT group showed a reduction in body weight when compared to the HC and NC (p < 0.05). Regarding CSA, the trained groups showed a significant increase in relation to their respective controls (NT, 1245,3 ±446,0 vs. NC, 836,7 ±247,8 μm² – p <0,05) (HT, 1347,5±428,2 vs. HC, 878,3 ±137,2 μm² – p <0,05). No differences were identified between the NT and HT groups. It is concluded that HD did not show differences in CSA when compared to the normoprotein diet of animals submitted to ST for twelve weeks. New studies are needed for new developments.