Efeitos da suplementação de whey proteins associado ao treinamento resistido por doze semanas sobre a morfologia cardíaca de ratos wistar

Abstract

Objective: To verify the effect of supplementation of 4 g/kg/day doses of whey proteins associated with 12-week resistance training on the myocardium of male Wistar rats. Materials and Methods: Study carried out with 12 male Wistar rats with an initial age of 60 days and body mass from 250g to 350 grams (g), randomly divided into four groups, being a control (C), a supplemented (W4), a trained control (TC) and a trained and supplemented (TW4). The protocol lasted 12 weeks with daily supplementation and resistance training three times a week. The feed consumption (CR), total body mass (MCT), myocardial mass (MMC), cardiac hypertrophy index (HCI) and maximal load test (MCT) were evaluated. Results: All groups had a non-linear feed intake during the protocol. The TC group consumed larger amounts of feed and the supplemented groups (W4 and TW4) consumed smaller amounts of feed. The TC group also presented greater total body mass after the protocol, but in percentage, the W4 group has a greater increase in body mass with 59.7%. The myocardial mass was higher in the TR group, the groups that received supplementation had lower values of cardiac mass. The cardiac hypertrophy index was higher in the group (CT) and lower in the supplemented group (W4). Muscle strength assessed by the maximum load test showed an increase in both trained groups. Discussion: the whey protein supplementation possibly promoted greater satiety in the feed consumption of the supplemented groups. The training protocol associated with supplementation used for long periods (such as 12 weeks) seems to cause non-linear changes in the food consumption of rats. The total body mass of the groups increased at the end of the twelve weeks, therefore, this variable increased independently of resistance training and protein supplementation. The higher cardiac hypertrophy index level in the control group shows that there was no potentiating effect regardless of the stimuli applied during the protocol. Muscle strength was possibly potentiated by the supraphysiological dosage of whey proteins. Conclusion: The supraphysiological protein dosage associated with resistance training for twelve weeks did not cause increases in the analyzed variables, except for the strength test. The application of resistance training and protein supplementation independently in their respective groups promoted the respective increases sought in the present study.