Key result
Heart rate variability indices were evaluated for test-retest reliability and compared with between-subject variation to produce sample size estimates.
This editorial highlights the importance of quantifying the test-retest reliability of heart rate variability indices and providing sample size estimates for future studies.
HRV (heart rate variability) is a non-invasive maker of cardiac autonomic modulation utilized in many hundreds of scientific studies each year. The reliability of heart rate variability has been frequently investigated yet remains poorly quantified. Assessing the reliability of a measure that assesses dynamic physiological processes and shows large between- and within-subject variation is a complex task. In this issue of Clinical Science, Pinna and co-workers provide excellent insight into the test-retest reliability of commonly used HRV indices and put the values obtained into context by comparing them with levels of between-subject variation and by producing sample size estimates.
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Gavin Sandercock (2007) reported an editorial. Heart rate variability (HRV) was evaluated. Heart rate variability indices were evaluated for test-retest reliability and compared with between-subject variation to produce sample size estimates.
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