Key result
Using an electronic activity monitor to determine actual sleep periods resulted in a significantly larger calculated nocturnal systolic blood pressure fall compared to arbitrary time periods (21.1 vs 14.9 mmHg, p=0.008).
Why the study?
Does the use of an electronic activity monitor to determine actual awake/sleep periods alter the interpretation of 24-hour ambulatory blood pressure monitoring in normotensive and hypertensive subjects?
Observational (n=25)
No
Does the use of an electronic activity monitor to determine actual awake/sleep periods alter the interpretation of 24-hour ambulatory blood pressure monitoring in normotensive and hypertensive subjects?
Absolute Event Rate: 21.1% vs 14.9%
p-value: p=0.008
Using an electronic activity monitor to determine actual awake/sleep periods during 24-hour ABPM significantly alters nocturnal BP measurements and dipper classification compared to arbitrary periods.
Activity monitor-defined sleep periods were associated with larger nocturnal SBP dipping on ABPM; leaves open effects on dipper classification and risk prediction.
Background and Objectives：The overriding influence of physical activity and the diurnal variation during ambulatory blood pressure monitoring (ABPM) has been well demonstrated. We prospectively evaluated the usefulness of electronic activity monitoring for deriving the actual physical activity and the diurnal variation of ABPM. Subjects and Methods：24-hour ABPM with using an electronic activity monitor was performed on ten normotensive volunteers and fifteen hypertensive subjects. To interpret the ABPM results of the fifteen hypertensive subjects, we obtained the actual awake/sleep periods of every subject with using an electronic activity monitor. Results： The activity values obtained from the ten normotensive volunteers correlated well with the values of the blood pressure (BP) and the heart rate. In the hypertensives, the nocturnal mean BP derived by the actual period was significantly lower than that derived by the arbitrary period (130±16/81±13 mmHg versus 124±13/77±12 mmHg, respectively, p<0.05). The nocturnal BP fall derived by the actual period was significantly larger than that derived by the arbitrary period (14.9±8.7/11.6±7.5 mmHg versus 21.1±8.6/16.2±7.4 mmHg, respectively, p<0.01). Four among the 7 non-dippers determined by the arbitrary period were re-classified as dippers when the actual period was used. One among the 13 hypertensives, as determined by the arbitrary period, was also re-classified as a non-hypertensive. Conclusion：The electronic activity monitor was able to determine the actual activity level. The interpretation of ABPM may be altered by the use of the electronic activity monitor. These results suggest that the accuracy and reproducibility of the 24-hour ABPM will be improved by using an electronic activity monitor. (Korean Circulation J 2006;36:91-98)
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Han et al. (2006) conducted an observational in Hypertension (n=25). Actual awake/sleep periods determined by electronic activity monitoring vs. Arbitrary fixed daytime/nighttime periods was evaluated on Nocturnal systolic blood pressure fall (p=0.008). Using an electronic activity monitor to determine actual sleep periods resulted in a significantly larger calculated nocturnal systolic blood pressure fall compared to arbitrary time periods (21.1 vs 14.9 mmHg, p=0.008).
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