Comparison of respiratory metabolic performance. Respiratory quotient (A) and carbohydrate oxidation (B) were calculated using oxygen consumption and carbon dioxide production and were compared among the mean values of the three trials for 30 min after glucose administration. The trials analyzed include: rest, rest with placebo intake; placebo, exercise with placebo intake; fermented milk, exercise with fermented milk intake. Values are represented as mean ± standard error for 18 subjects. *, Statistically significant differences were at the level of p < 0.05.