# How is the cycle factor calculated for cardiopulmonary stress testing of sedentary women?

Updated: May 14, 2020
• Author: Kevin McCarthy, RPFT; Chief Editor: Nader Kamangar, MD, FACP, FCCP, FCCM  more...
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For sedentary women, calculate the cycle factor, ie, cycle factor = 22.78 – (0.17 × age), as follows:

• Step 1: Measure her weight (W [kg]) and height (H [cm]) in light clothes and without shoes, and record age (A [y]).

• Step 2: Calculate her normal (predicted) W in kg, ie, normal (predicted) W = (0.65 × H) – 42.8.

• Step 3A: If her actual W equals her normal W, the formula is predicted peak VO2 (mL/min) = (actual W + 43) × cycle factor.

• Step 3B: If her actual W is less than her normal W, the formula is predicted peak VO2 (mL/min) = [(normal W + actual W + 86)/2] × cycle factor.

• Step 3C: If her actual W exceeds her normal W, the formula is predicted peak VO2 (mL/min) = [(normal W + 43) X cycle factor] + [6 × (actual W – normal W)].

• Step 4: If a treadmill is used rather than a cycle, multiply her predicted VO2 by 1.11.