Nonstationary time series analysis of heart rate variability
Abstract
An analysis of the RR-interval time series, ti, is presented for the case in which the average time, t, changes slowly. In particular, t and a short-time scale variability parameter, V, are simultaneously measured while t decreases for subjects in the reclined position. The initial decrease in t is usually linear with V yielding parameters that can be related to physiological quantities.
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