Table 4. Serum testosterone and cortisol concentrations (nmol/L) in the whole group measured at PRE, POST, POST 15, and POST 24h and relative changes right after, 15 min after, and 24 hours after the strength loading protocol two weeks after the start of the intervention and six and 10 weeks after the strength training intervention. Values are presented as mean and SD. WK 2 WK 6 WK 10 ∆% from PRE ∆% from PRE ∆% from PRE Testosterone PRE 11.5±3.8 12.9 ±4.8 13.9 ±5.4 POST 12.9 ±4.2 13.8 ±27.8 15.3 ±5.2 *** 23.6 ±23.8 16.6 ±5.7 *** 23.8 ±23.8 POST 15 12.4 ± 4.5 6.4 ±27.3 14.3 ±5.0 ** 19.2 ±24.2 15.8 ±5.7 ** 15.9 ±19.2 POST 24h 12.7 ±3.6 16.4 ±44 13.2 ±6.3 2.4 ±22.15 14.8 ±6.2 9 ±18.6 Cortisol PRE 304 ±101.3 302.3 ±104.5 308.7 ±128.6 POST 290.9 ±154.8 -2.7 ±47.4 355.3 ±144 28 ±65.4 384.7 ±118 56.4 ±96.6 POST 15 340.9 ±175.8 14.8 ±51.6 393.2 ±152 49.8 ±89.3 429 ±128.1 * 80.4 ±120.3 POST 24h 318.2 ±142.5 8.4 ±40 291 ±118.8 2.1 ±42.2 304.5 ±93.8 23.2 ±90.7 *P ≤ 0.05, **P ≤ 0.01, ***P ≤ 0.001. All significances measured from pre.