Journal
PSYCHOPHYSIOLOGY
Volume 47, Issue 6, Pages 1102-1108Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1469-8986.2010.01018.x
Keywords
Baroreceptor cardiac reflex sensitivity; Inter-systolic interval; ECG R-R; Agreement analysis
Funding
- Spanish Commission of Science and Technology [SEJ2006-09808]
- Junta de Andalucia [HUM338]
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Baroreceptor reflex sensitivity (BRS) is frequently evaluated using the spontaneous sequence method. Many of these studies use the inter-systolic interval (ISI) derived from a blood pressure monitor (e.g., Finapres) as interbeat interval measure instead of the traditionally recommended R-R series derived from the ECG. In this study, we examine possible differences between estimates of BRS from ISI and ECG R-R intervals. BRS was evaluated in 35 participants under three conditions: rest, mental arithmetic, and recovery periods. Although correlations between the two estimates are very high (all rs >.9), small but significant differences were found: the measures from ISI systematically yield higher BRS values and result in the detection of a greater number of reflex sequences. The higher BRS values from measures of ISI are due to the effects of pulse transit time fluctuations associated with the sequences of change in blood pressure.
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