| Intra-inter visit reproducibility of short-term linear and nonlinear measurement of heart rate variability in tetraplegia and neurologically intact controls. | |
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MedLine Citation:
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PMID: 20130343 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Heart rate variability (HRV) from the frequency domain and three calculations of entropy (En), approximate (ApEn), sample (SampEn) and Lempel-Ziv (LZEn), were assessed for intra- and inter-visit reproducibility from short-term recordings in persons with tetraplegia and neurologically intact controls. The intraclass correlation coefficient (ICC) was calculated for multiple comparisons to determine the reproducibility in both groups during a 4 h visit and across three visits. By ICC in both groups, ApEn, SampEn and LZEn possessed excellent intra- (>or=0.87) and inter-visit reproducibility (>or=0.90). In contrast, frequency domain measures were collectively less concise. In general on intra- and inter-visit comparisons for both groups, high frequency (HF) measures were more reliable than low frequency (LF). In control subjects relative to other units of expression, normalized units (nu) of LF had the best intra-visit reliability across all comparisons. This was not the case on inter-visit comparisons where absolute (>or=0.74) and natural log (ln) (>or=0.66) representations of LF were more reliable. In the group with tetraplegia, LFln was the most reliable for comparisons up to or including 180 min (>or=0.60) and two visits (>or=0.63). Thus, calculations of En and HF HRV appear to be more reliable than LF HRV and less confounded by small sample sizes. |
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Authors:
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M F La Fountaine; J M Wecht; A M Spungen; W A Bauman |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-02-03 |
Journal Detail:
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Title: Physiological measurement Volume: 31 ISSN: 1361-6579 ISO Abbreviation: Physiol Meas Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-02-23 Completed Date: 2010-05-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9306921 Medline TA: Physiol Meas Country: England |
Other Details:
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Languages: eng Pagination: 363-74 Citation Subset: IM |
Affiliation:
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Center of Excellence for the Medical Consequences of SCI, James J Peters VA Medical Center, Bronx, NY, USA. michael.lafountaine@va.gov |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Diagnostic Techniques, Cardiovascular* Female Heart Rate* Humans Linear Models Male Middle Aged Nonlinear Dynamics Quadriplegia / physiopathology* Reproducibility of Results Time Factors Young Adult |
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