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Fatigue during heavy-intensity exercise results not from reactions which utilize oxygen but from the consequences of those reactions which provide the supplementary energy for the oxygen which is required but not utilized. Consequently, the components of the oxygen deficit at different work intensities are crucial determinants of the ability to sustain constant-load exercise. It is necessary, however, to provide a clear definition of work intensity. Work rate is an absolute physical construct that has the units of power, that is, kilogram-meters/minute, foot-pounds/second, or Watts for example. Work intensity, on the other hand, is a relative construct which refers to the relative ease of performing a particular work rate. Although there is no consensus as to the term'work intensity', we find aspects of the definition provided by Wells et al.[1] to be most logically consistent and physiologically defensible. Rather than assign …