Changes in the plasma glucose, insulin and FFA levels during exercise and after 1 h of exercise. CON: distilled water with training, SP: silk peptide-treated with training. A, Glucose; B, Insulin; C, FFA (free fatty acids) at rest, after exercise, and recovery in the CON and SP groups. Values are presented as means ± standard deviation (n = 36). * vs. rest, P < 0.001; # vs. After-exercise, P < 0.01.