Thus the slight trend for increased RF with age in the female population, along with stronger relationships between RF and RFV in the female population, together with the strong effects of RF and RFV on the duration of synchronization, manifest in a highly significant lengthening in the epochs of synchronization in older females. 5.3.3 Surrogate data The first point to be settled is whether the synchronization reflects the true cardiovascular interaction, or whether it is just noise, i.e. a random fluctuational phenomenon.
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