Validation of End-of-Session D′ Balance for Quantifying and Differentiating Exhaustive and Nonexhaustive Intermittent-Training Sessions in Runners

End-of-session D' balance did differentiate between exhaustive and nonexhaustive intermittent sessions. However, since D' balance at the end of exhaustive sessions should approximate 0, end-of-session D' balance did not accurately quantify exhaustive sessions as exhaustive. The inaccurate quantification of end-of-session D' balance during exhaustive intermittent running sessions is likely related to the exponential recovery of D' that is reliant on an accurately quantified recovery time constant.