Chrono-Pharmacology & Clinical Dosing Calculators
Eliminate guesswork from your longevity stack. Compute precise bodyweight-adjusted dosages, biological clearance half-lives, exercise adaptation blunting lockouts, and thermal conditioning thresholds grounded directly in peer-reviewed human clinical trials.
Caffeine Circadian Half-Life & Sleep Disruption Calculator
Caffeine competitively binds to adenosine A₁ and A₂ₐ receptors in the preoptic area of the brain. When residual bedtime levels exceed 25 mg, slow-wave deep sleep (SWS) is suppressed by up to 20% (Drake et al., 2013).
1. Input Consumption Schedule
To keep residual bedtime caffeine below 25 mg, consume your last sip before 9:35 AM.
In double-blind placebo-controlled human trials, 400mg caffeine taken even 6 hours before bedtime reduced total sleep time by over 1 hour and fragmented slow-wave delta sleep.
Why does caffeine timing matter more than total dose?
Adenosine accumulation throughout the day generates "sleep pressure." Even if you fall asleep easily with caffeine in your bloodstream, residual adenosine receptor antagonism fragments stage 3/4 slow-wave sleep, impairing glymphatic brain waste clearance.
Why do plant-based diets require more creatine?
Dietary creatine is exclusively found in animal flesh. Vegans and vegetarians display significantly lower baseline muscle creatine stores (~90–110 mmol/kg dry muscle vs 120–130 in omnivores). Adding a +1.5g daily buffer accelerates saturation and enhances executive cognitive function.
What is the biological mechanism of cold plunge blunting?
Sub-55°F water immersion immediately post-lift acutely inhibits p70S6K and S6 ribosomal protein phosphorylation. Cryotherapy also suppresses intramuscular natural COX-2 inflammatory cascades and satellite cell proliferation, reducing long-term myofibrillar hypertrophy by up to 50%.
What is the Søberg Principle for thermal conditioning?
Pioneered by Dr. Susanna Søberg (Cell Reports Medicine, 2021), the principle establishes minimum weekly thresholds (11 min cold immersion / 57 min sauna) for metabolic adaptation. Critically, when alternating heat and cold, always end on cold to force natural thermogenesis without external warming.