(A) PCA score plot of PC2 versus PC1. The control group (n = 5), food-restricted group (n = 5), and fatigued group (n = 5) are shown as black, green, and red circles, respectively. Black ellipses represent the 90% confidence intervals for each group. (B) PCA loading plot of PC2 versus PC1. The data were analyzed after being mean-centered and variance scaled.