Figure 4.

Data are the mean ± SEM of mean concentrations of F (left), LH (middle), and Te (right) during the morning (top) and in the late afternoon (bottom). Within each panel, data are grouped by rested sleep (black column) or restricted sleep (gray column) in young (left) and older (right) men. Statistically significant Sleep, Age, and SleepxAge effects are shown by the p-value. Statistically significant contrasts between the rested sleep and restricted sleep conditions in young or older men are shown by *p < 0.05 (Bonferroni adjusted) or **p < 0.0167 (Bonferroni adjusted). The absence of asterisks indicates that a significant contrast was not observed.