Abstract

It has been suggested that glycogen depletion followed by a protein-fat diet and a carbohydrate-rich diet improves performance. Four male subjects participated in a 5-week protocol of which the first 3 weeks were devoted to a control period and the last 2 weeks to the experimental phase of the study. The variables measured before, during, and following the experimental phase included anthropometric and basal metabolic rate measurements, urinary and serum analysis for vitamin, SMA 12/60 blood profile and aerobic performance (VO2 max). During the protein-fat diet there was a decrease in serum glucose and resting respiratory quotient and an increase in cholesterol, blood ureanitrogen, riboflavin, and N1-methylnicotinamide excretion. Subsequent to the carbohydrate-rich diet there was an increase in triglycerides and vitamin C, riboflavin, and thiamin excretion while there was a decrease in serum blood urea nitrogen, and N1-methylnicotinamide excretion. Aerobic performance was slightly decreased and the mean postexercise lactate levels were slightly higher after the carbohydrate-rich diet. It was hypothesized that the reduced niacin intake during the carbohydrate-rich diet may hamper the aerobic oxidative pathways. Verf.-Referat (gekuerzt)