Training & Movement9 min read
The Real Return on Cardio
Zone 2 physiology, mitochondrial density, stroke volume, and the myth of interference.
Editorial Topics
Muscle Manual covers human physiology and performance across six structured editorial fields. Explore our stories by topic below.
01
Training & Movement
Biomechanical evidence, resistance adaptation, progressive overload, and movement efficiency.
Training & Movement9 min read
Training After 40
Managing tendon viscoelasticity, motor unit preservation, and systemic fatigue.
Training & Movement8 min read
The Science of Everyday Movement
Non-exercise activity thermogenesis, lipoprotein lipase regulation, and overcoming metabolic stagnation.
02
Nutrition & Metabolism
Macronutrient kinetics, metabolic regulation, energy balance, and clinical dietary research.
Nutrition & Metabolism9 min read
The Real Protein Question
Distribution kinetics, muscle protein synthesis thresholds, and the upper limits of amino acid utilization.
Nutrition & Metabolism9 min read
Nutrition Myths Worth Retiring
What the evidence says about meal frequency, carbohydrate timing, and metabolic damage.
03
Health & Longevity
Cardiovascular risk stratification, cellular senescence, metabolic health, and biological aging.
Health & Longevity10 min read
The Science of Living Longer
Cardiorespiratory fitness, muscular strength, and the physiological drivers of human longevity.
Health & Longevity9 min read
Exercise and Mental Health
Myokines, BDNF neuroplasticity, and clinical evidence across depressive disorders.
04
Sleep & Recovery
Circadian neurobiology, glymphatic clearance, autonomic nervous system tone, and tissue repair.
Sleep & Recovery8 min read
Your Brain on Better Sleep
Glymphatic clearance, memory consolidation, and the neurological cost of chronic restriction.
Sleep & Recovery8 min read
The Science of Stress Recovery
Autonomic nervous system balance, heart rate variability, and managing allostatic load.
05
Human Performance
Work capacity, bioenergetics, neuromuscular power, fatigue thresholds, and cognitive execution.
Human Performance8 min read
Caffeine and Performance
Adenosine antagonism, dosage timing, and the genetics of individual metabolic clearance.
Human Performance9 min read
Recovery, Rest, and Adaptation
The timeline of supercompensation, glycogen resynthesis, and central fatigue.
06
Science & Diagnostics
Serum biomarkers, metabolic testing, physiological screening, and interpreting clinical data.
Science & Diagnostics9 min read
What Your Bloodwork Really Tells You
Interpreting ApoB, fasting insulin, and high-sensitivity CRP beyond conventional reference ranges.