Scientific Mechanics of Progressive Overload
Progressive overload is the continuous elevation of mechanical tension required to induce skeletal muscle hypertrophy. Adjusting load based on Rate of Perceived Exertion (RPE) ensures systematic neuromuscular adaptation while limiting central nervous system fatigue.
Circadian Rhythms & Recovery Architecture
Human sleep cycles operate on ~90-minute ultradian oscillations. Waking up during stage N3 (slow-wave sleep) produces grogginess. Aligning wake times with light NREM/REM transitions optimizes peak daytime cortisol and growth hormone release.