Protocol Glossary
Science-backed definitions for every term in your health data: plain English and the mechanism behind it.
Acute:Chronic Workload Ratio (ACWR)
The ratio that separates productive overload from injury risk
→ Read definitionAerobic Threshold (AeT)
The Zone 2 ceiling: where fat starts ceding to carbohydrates
→ Read definitionAllostatic Load
Your total accumulated stress burden: the body cannot separate the sources
→ Read definitionDeload Week
The planned reduction in training stress where adaptation actually lands
→ Read definitionDetraining
How fast your fitness actually disappears when you stop
→ Read definitionDOMS (Delayed Onset Muscle Soreness)
The 24 to 72 hour soreness signal after novel or hard training
→ Read definitionEPOC (Excess Post-Exercise Oxygen Consumption)
The temporary afterburn cost of hard training
→ Read definitionHIIT (High-Intensity Interval Training)
Short bursts of hard effort for cardiovascular adaptation
→ Read definitionHypertrophy
The structural enlargement of muscle fibers in response to training stress
→ Read definitionLactate Threshold
The intensity above which your pace becomes unsustainable
→ Read definitionMitochondrial Biogenesis
Growing new mitochondria: the cellular adaptation that drives aerobic fitness
→ Read definitionMuscle Protein Synthesis (MPS)
The cellular process that builds and repairs muscle
→ Read definitionOne-Rep Max (1RM)
The ceiling that calibrates everything else
→ Read definitionOvertraining Syndrome
When accumulated stress outpaces recovery for long enough to break the system
→ Read definitionPeriodization
The structured organization of training stress and recovery across time
→ Read definitionProgressive Overload
The principle that drives all adaptation: consistently increase the demand to keep improving
→ Read definitionRPE (Rate of Perceived Exertion)
Your body's internal intensity gauge
→ Read definitionSupercompensation
The overshoot above baseline that makes training produce fitness
→ Read definitionTRIMP (Training Impulse)
A single number for quantifying training stress
→ Read definitionZone 2
Low-intensity cardio that builds the engine everything else runs on
→ Read definitionMore terms added regularly. Check back for new entries across all categories.
