Muscle Physiology Lab Sim v2.4

Physiological Drivers
Mechanical Tension (Lifting) 0 %
Activates mechanosensors (costamere focal adhesions) & p70S6K signaling.
AAS / Supraphysiologic Androgens 0 mg/wk
Upregulates nuclear transcription & myonuclear accretion.
Ethanol Consumption (Alcohol) 0 g/day
Suppresses mTORC1, decreases muscle protein synthesis (MPS) by ~24-37%.
Dietary Leucine / Protein Intake 1.2 g/kg
Saturates Sestrin2/Rag GTPases to trigger mTOR intracellular docking.
Sim Timeline Controls
Duration (Weeks) 16 Weeks
Net MPS Rate
+0.0 %
mTORC1 Activation
12 %
Cross-Sectional Area Δ
+0.2 %
Myonuclear Count
100 %
Microscopic Fiber Cross-Section
mTORC1 Molecular Pathway Map
Longitudinal Muscle Mass Trajectory (kg Lean Mass Δ)
🔬 Case Analysis: The Peter Mossfield Phenomenon

In a viral exercise experiment, Peter Mossfield administered supraphysiological anabolic steroids and consumed high levels of ethanol without engaging in resistance training. While AAS enhances basal transcription, mechanical tension is required to recruit satellite cells, induce myonuclear accretion, and fully activate focal adhesion kinase (FAK) / mTORC1. Furthermore, heavy alcohol directly impairs 4E-BP1 phosphorylation and translational capacity, drastically undermining potential pharmacological muscle gains and leaving him in a compromised, fat-accumulated body composition at competition.

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