EFFECT OF EXERCISE AND PROTEIN-INTAKE ON ENERGY-EXPENDITURE IN ADOLESCENTS

In order to evaluate the influence of physical exercise and protein in take on Resting Metabolic Rate (RMR) and Postprandial Energy Expenditu re (PEE), 16 healthy, normal-weight, 15 year-old, adolescent males at the same stage of pubertal development were studied. They were assigne d to two dietary groups receiving the same energy intake (1.3 x by mea sured RMR) and different proportions of macronutrients (13 % protein, 39 % fat, 48 % CHO in Group A; 30 % protein, 32 % fat, 38 % CHO in Gro up B). An increase in postprandial energy expenditure, relative to bas al, was observed in all individuals. The postprandial energy expenditu re was higher in group B than in group A. Postprandial Post-exercise T hermogenesis (expressed as Kcal/3 h) was significantly higher in group B than group A (p<0.05). Although the RMR on the test day was not dif ferent between the groups, the RMR on day 2 was significantly higher t han on day 1 in group B (p<0.01). In group B, the post-exercise RQ was significantly lower than the preexercise RQ (p<0.01). It is concluded that in normal-weight-adolescents, a hyperproteic diet followed by mo derately-intensive exercise induces increases in EE and decreases in R Q in the postprandial post-exercise period and is accompanied by incre ase in the RMR the following day.