Anabolic sleep stages: slow-wave stage 3/4 non-REM sleep, nocturnal growth hormone secretion, testosterone pulsing, and mitigating training cortisol spikes.
Resistance training creates the catabolic micro-trauma; actual muscle protein accretion occurs exclusively during deep recovery periods and slow-wave sleep.
1. Sleep Hormone Architecture
Growth Hormone Peaks: Over 70% of daily endogenous growth hormone (GH) is secreted in pulsatile waves during Stage 3 Slow-Wave Sleep (SWS).
Testosterone Synthesis: Fragmented or < 6 hours of sleep decreases daytime circulating testosterone by up to 15% in healthy young men.
Cortisol Regulation: Chronic sleep deprivation elevates baseline cortisol, upregulating myostatin and promoting muscle protein catabolism.
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Strength & Exercise Physiology Review Board
Our editorial team includes CSCS certified strength and conditioning specialists, sports nutritionists, and biomechanists reviewing muscle protein synthesis trials, mTORC1 signaling pathways, and lifting torque mechanics.
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