Statistics and graphs for heart rate variability: pNN50 or pNN20?

T. P. Hutchinson

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)


    Two measures of heart rate variability, pNN50 and pNN20, are compared. A non-linear transformation of these measures is proposed, that is helpful in understanding their interrelationship. Provided a valid statistical test is employed, results from analysing pNN20 are likely to be equivalent to those from analysing pNN50. Arguments recently made by Mietus et al (2002 Heart 88 378–80) against the commonly used pNN50 are unconvincing.
    Original languageEnglish
    Pages (from-to)N9-N14
    Number of pages6
    JournalPhysiological Measurement
    Issue number3
    Publication statusPublished - 2003


    • heart rate variability
    • cardiac parasympatheticmodulation
    • pNN50
    • statistical testing


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