Title |
Everything Hertz: methodological issues in short-term frequency-domain HRV
|
---|---|
Published in |
Frontiers in Physiology, May 2014
|
DOI | 10.3389/fphys.2014.00177 |
Pubmed ID | |
Authors |
James A. J. Heathers |
Abstract |
Frequency analysis of the electrocardiographic RR interval is a common method of quantifying autonomic outflow by measuring the beat-to-beat modulation of the heart (heart rate variability; HRV). This review identifies a series of problems with the methods of doing so-the interpretation of low-frequency spectral power, the multiple use of equivalent normalized low frequency (LFnu), high frequency (HFnu) and ratio (LF/HF) terms, and the lack of control over extraneous variables, and reviews research in the calendar year 2012 to determine their prevalence and severity. Results support the mathematical equivalency of ratio units across studies, a reliance on those variables to explain autonomic outflow, and insufficient control of critical experimental variables. Research measurement of HRV has a substantial need for general methodological improvement. |
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Country | Count | As % |
---|---|---|
United States | 7 | 35% |
Spain | 1 | 5% |
Australia | 1 | 5% |
New Zealand | 1 | 5% |
Switzerland | 1 | 5% |
Norway | 1 | 5% |
Unknown | 8 | 40% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 11 | 55% |
Scientists | 7 | 35% |
Science communicators (journalists, bloggers, editors) | 1 | 5% |
Practitioners (doctors, other healthcare professionals) | 1 | 5% |
Mendeley readers
Geographical breakdown
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United States | 2 | <1% |
Brazil | 1 | <1% |
France | 1 | <1% |
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India | 1 | <1% |
Unknown | 401 | 98% |
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Researcher | 62 | 15% |
Student > Master | 61 | 15% |
Student > Bachelor | 40 | 10% |
Student > Doctoral Student | 27 | 7% |
Other | 61 | 15% |
Unknown | 83 | 20% |
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Medicine and Dentistry | 66 | 16% |
Engineering | 34 | 8% |
Sports and Recreations | 33 | 8% |
Neuroscience | 18 | 4% |
Other | 70 | 17% |
Unknown | 109 | 27% |