Non-symmetrical double-logistic analysis of 24-h blood pressure recordings in normotensive and hypertensive rats.

Abstract:

OBJECTIVE:To determine the suitability of a new logistic curve fitting procedure to measure the diurnal rates of transition from the active to the asleep periods separately. METHOD:We applied this method to 24-h telemetry recordings of systolic, mean, diastolic arterial pressure (SAP, MAP, DAP, respectively), heart rate (HR) and locomotor activity of normotensive Sprague-Dawley rats (SDR) and spontaneously hypertensive rats (SHR). RESULTS:There was a similar pattern of higher awake and lower sleep values (16 +/- 1 mmHg SAP, 77 +/- 2 bpm HR and 40 +/- 2 units activity) in SHR. In SDR, awake-asleep differences were less for SAP (9 +/- 1 mmHg) but similar for HR (83 +/- 2 bpm). In SHR, while the blood pressure patterns were symmetrical, the rate of rise in activity and HR during arousal was more rapid than the rate of decline during the dark to light transition. By contrast in SDR, the arousal rate of increase in blood pressure and HR was much less than the rate of decline. Thus SHR have an exaggerated arousal surge in DAP compared with SDR. Double logistic provides a better fit than Cosinor or square wave and better estimates of day-night differences than partial Fourier. CONCLUSIONS:Analysis of 24-h recordings by a new logistic curve method reveals distinct asymmetric circadian patterns of cardiovascular and activity changes in rats. The greater surge in arousal blood pressure in SHR is not associated with differences in HR or activity changes and may be inherent to the underlying mechanisms contributing to the hypertension in SHR.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Head GA,Lukoshkova EV,Mayorov DN,van den Buuse M

doi

10.1097/00004872-200411000-00008

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

2075-85

issue

11

eissn

0263-6352

issn

1473-5598

pii

00004872-200411000-00008

journal_volume

22

pub_type

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