O2 Uptake, Exercise & Cor. Circ., Dr. D. Penney

Oxygen Uptake: Rest vs. Exercise:

Modified Fick Eq. -
VO2 = Q x (A - VO2 difference)
........ or
VO2 = HR x SV x (A - VO2 difference)

1 MET (Metabolic Equivalent) = 3.5 ml/kg/min (rest) or approx. 250 ml/min.

  • Aerobic Capacity is VO2 max.; ca. 12 METS
  • Anaerobic Threshold - peak rate of O2 uptake sustainable without increasing blood lactate and producing muscle fatigue; evident by increased CO2 release.

    VO2 = oxygen uptake (ml/kg/min.)
    Q = cardiac output (ml/min.)
    HR = heart rate (beats/min.)
    SV = stroke volume (ml)
    A-VO2 diff. = arteriovenous oxygen diff. (ml/dl)

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