Variability of R-R, P wave-to-R wave, and R wave-to-T wave intervals
| Autor: | H. Bo, J. Forester, J. D. Henderson, J. W. Sleigh |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Adult
Male Sympathetic Nervous System Supine position Physiology Posture RR interval Electrocardiography QRS complex Nuclear magnetic resonance Heart Rate Physiology (medical) Healthy volunteers Supine Position Humans PR interval Sinoatrial Node Physics Models Statistical Respiration P wave Power spectral analysis Reproducibility of Results Vagus Nerve Anesthesia Atrioventricular Node Female Cardiology and Cardiovascular Medicine |
| Zdroj: | American Journal of Physiology-Heart and Circulatory Physiology. 273:H2857-H2860 |
| ISSN: | 1522-1539 0363-6135 |
| DOI: | 10.1152/ajpheart.1997.273.6.h2857 |
| Popis: | We analyzed the effect of changing posture from supine to standing on the variability of R-R, P-R, and R-T intervals in 10 healthy volunteers using power spectral analysis. An electrocardiogram and respiratory trace were recorded before and after posture change. Variability in the P-R and R-T intervals was much less than in the R-R interval and demonstrated a lower low-frequency (LF)-to-high-frequency (HF) ratio. Changing from a supine to a standing position showed no change in indexes of vagal influence on the P-R and R-T variability, in contrast to the well-documented decrease in the indexes of vagal influence on the R-R variability (HF power decreased from 2.33 to 0.41 ms2, P = 0.003; amplitude of the respiration-to-heart rate impulse response decreased from 31.6 to 14.4 ms ⋅ ml−1 ⋅ s−1, P = 0.03; and LF/HF increased from 1.96 to 5.22, P = 0.005). We concluded from this study that the effects of standing were an observed reduction in vagal influence on the heart rate variability of the R-R interval and maintenance of lung volume-related vagal modulation of the P-R and R-T intervals. |
| Databáze: | OpenAIRE |
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