Conditions:
(1) The equation is valid for power outputs of 150-750 kg•m/min.
(2) The arm cranking rate must be known.
oxygen uptake in mL per minute =
= (resting oxygen uptake) + (vertical oxygen uptake)
resting oxygen uptake in mL/min =
= 3.5 * (body weight in kilograms)
vertical oxygen uptake =
= 3.0 * (power output in kg•m/min) =
= 3.0 * (kg resistance) * (meters per crank revolution) * (cranking rate in revolutions per minute)
where:
• 3.0 is the regression constant for converting kg•m/min to mL/min.
• There is no horizontal component to activity.
• kilograms resistance indicates the resistance setting for the ergometer.
• The meters per crank revolution varies with the ergometer used (2.4 m/rev for Monark arm ergometers).
• The cranking rate typically ranges from 50-60 rpm.
resting oxygen uptake in L/min =
= (resting oxygen uptake in mL/min) / 1000
resting oxygen uptake in mL per kg per min =
= (resting oxygen uptake in mL/min) / (body weight in kilograms)
