Abstract
Use aerobic energy expenditure instead of oxygen uptake to quantify exercise intensity and predict endurance performance
Highlights
Endurance performance depends on the body’s ability to uptake and utilize oxygen to generate energy [4, 10, 12]
We propose that exercise economy (Eaero), maximal aerobic capacity (Eaero max), and intensity (%Eaero max), should be calculated using units of aerobic energy rather than oxygen
Compared with relative aerobic intensity expressed as %V O2max, %Eaero max elicits numerically lower relative aerobic intensities when respiratory exchange ratio (RER) is Ͻ1.0 and yields the same relative aerobic intensities when RER Ն1.0 (Fig. 1)
Summary
Endurance performance depends on the body’s ability to uptake and utilize oxygen to generate energy [4, 10, 12]. The difference between %Eaero max and %V O2max is greater at lower relative aerobic intensities (Fig. 1). Data from Burke et al [3] provide a clear example of the differences that can occur between the two methods of calculating relative aerobic intensity.
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