Abstract
Putative point-and-interval estimates of the circadian period τ of cardiovascular variables were obtained from 95 clinically healthy nurses who measured their blood pressure and heart rate about every 15 minutes for 48 hours in November or June, using a Colin Medical Instruments ABPM-630 ambulatory monitor. Linear-nonlinear least-squares rhythmometry yields estimates of the circadian period, with a single-component (24-h cosine curve) and a two-component (24- and 12-h cosine curves) model. For systolic blood pressure, in an individualized fashion, analysis based on a single 24-h component allows the determination of the circadian period with 95% confidence limits in all but three of the 95 series. On a population average, 95% confidence intervals bracket anticipated periods of 24 and 12 h; but on an individualized basis, the 95% confidence interval of τ does not cover precisely 24 h in almost 50% of the cases. A reference standard is provided for the assessment by linear-nonlinear rhythmometry of circadian cardiovascular periods under usual conditions of life with a 48-h record.
| Original language | English (US) |
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| Title of host publication | Proc Second Ann IEEE Symp Comput Based Med Syst |
| Editors | Anon |
| Publisher | Publ by IEEE |
| Pages | 206-213 |
| Number of pages | 8 |
| State | Published - Dec 1 1989 |
| Event | Proceedings: Second Annual IEEE Symposium on Computer-Based Medical Systems - Minneapolis, MN, USA Duration: Jun 26 1989 → Jun 27 1989 |
Other
| Other | Proceedings: Second Annual IEEE Symposium on Computer-Based Medical Systems |
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| City | Minneapolis, MN, USA |
| Period | 6/26/89 → 6/27/89 |