Physiological Profiles

Struct. Limited TH‑Limited Balanced Aerobic
W' Anaerobic reserve Z3 Threshold Z2 OGC crossover Z1 Aerobic base ZR Type I oxidative IIA oxidative Type IIA IIA O→G crossover IIA glycolytic Type IIX Fiber Recruitment / Glycolytic Demand Type I Type IIA Type IIX Intensity → Low High pVO₂max LT1 OGC CP LT1 OGC CP LT1 OGC CP LT1 OGC CP
ZR
Recovery
Z1
Endurance
Z2
Tempo
Z3
Threshold
W'
Anaerobic
All four physiological profiles shown. Each curve represents how fiber recruitment and glycolytic demand increase with intensity. The Structurally Limited profile rises earliest; the Aerobic profile stays flat longest before a late, steep climb. All converge at pVO₂max.
AngelaNaeth Coaching — Threshold Analyzer CP : pVO₂max ratio comparison

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