Table 2.

Morning circulating concentrations of testosterone and ACTH measured at baseline (B1), after six nights of sleep restriction (SR6) and after 1 or 12 sleep recovery nights (R1 and R12).

Circulating Concentrations	Baseline: B1	Restriction: SR6	Recovery: R1	Recovery: R12
Testosterone (nmol/L)	17.17 ± 1.51	13.89 ± 1.07##	15.86 ± 1.01	19.15 ± 1.72
ACTH (pg/mL)	50.40 ± 6.14	38.20 ± 6.78	48.01 ± 5.66	49.65 ± 8.17

Concentrations are represented as mean ± SEM (n = 12). Significant differences compared to baseline values (B1): ^##p < 0.01.