1. HR = 166 beats/min, stroke volume = 115 ml blood/beat, venous oxygen content

Question

1. HR = 166 beats/min, stroke volume = 115 ml blood/beat, venous oxygen content = 4 ml O2/100 ml blood, body mass = 55 kg.    Solve for the VO2 (ml O2/min) and (ml O2/kg/min).

2. VO2 = 25.34 ml O2/kg/min, HR = 135 beats/min, stroke volume = 97 ml blood/beat, body mass = 62 kg. Solve for the a-vO2 difference and venous O2 content (ml O2/100 ml blood).

3. VO2 = 2925 ml O2/min, HR = 150 beats/min, a-vO2 difference = 13 ml O2/100 ml blood. Solve for the stroke volume (ml blood/beat).

4. Maximal VO2 = 5780 ml O2/min, venous O2 content = 2 ml O2/100 ml blood, body mass = 72 kg, Age = 43 years, Sex= Female. Solve for a) the cardiac output (L/min) and VO2 (ml O2/kg/min).

5. For scenario #4 outlined above (obtained from a maximal oxygen consumption test), would you classify this individual as sedentary, average, above average or elite in terms of their fitness?   Why? Make sure to justify your response based upon all of the available information, not just a single, discrete parameter.

Explanation / Answer

1. HR = 166 beats/min, stroke volume = 115 ml blood/beat, venous oxygen content = 4 ml O2/100 ml blood, body mass = 55 kg.    Solve for the VO2 (ml O2/min) and (ml O2/kg/min).

VO2 (mL/min) = (HR x SV) x a-vO2

=(166 x 115) x 4

=76360 mL O2/min

In ml O2/kg/min

=76360/55

=1388.6 O2/kg/min

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