Heart rate variability (HRV) is an indirect index of autonomic nervous system homeostasis, and is used to assess changes in both negative and positive adaptation in athletes. It has been reported that coefficient variation (CV)of logarithm of the root mean square differences between adjacent normal R-R intervals (Ln RMSSD) is a sensitive response marker. In an earlier report, we showed that CVLn RMSSD was small throughout a successful season of a graduate student middle distance runner. AimWe reported the runner`s training load, psychological state,race performance, and HRV over the course of the following season. The present case study was unique due to the fact thatwe collected longitudinal data and enrolled the same subject who had already been reported on.
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