Jean-Louis Magali, Anwar Mujahid, Rosen Har'el, Craelius William, Hiatt Mark, Hegyi Thomas
Division of Neonatology, UMDNJ-Robert Wood Johnson Medical School and St Peter's University Hospital, New Brunswick, NJ 08903, USA.
Biol Neonate. 2004;86(2):81-4. doi: 10.1159/000077782. Epub 2004 Apr 8.
We used spectral analysis of heart rate variability, as a measure of autonomic tone, to determine spectral power differences in infants sleeping supine and prone. We studied 29 infants with a birth weight of 1,915 +/- 939 g, at the postconceptional age of 36 +/- 2 weeks. We then calculated total power (TP), low-frequency power (LF, 0.03-0.15 Hz), and high-frequency power (HF, 0.5-1.0 Hz). TP corresponds to overall heart rate variability, LF to both sympathetic and parasympathetic activity, and HF to parasympathetic activity only. Median (25th, 75th percentile) TP (beats/min2) in the supine position was 32.60 (23.12, 59.90), which was significantly higher than the prone position of 25.87 (14.94, 35.57). Similarly, LF (beats/min2) in the supine position of 13.82 (8.63, 23.31) was significantly higher than the prone position of 9.79 (5.46, 14.33). No significant difference was seen in the HF. We conclude that the prone position is associated with decreased heart rate variability and probably decreased sympathetic tone, which imply decreased autonomic stability in this position.
我们采用心率变异性的频谱分析作为自主神经张力的一种测量方法，以确定仰卧和俯卧睡眠的婴儿的频谱功率差异。我们研究了29名出生体重为1915±939克、孕龄为36±2周的婴儿。然后我们计算了总功率（TP）、低频功率（LF，0.03 - 0.15赫兹）和高频功率（HF，0.5 - 1.0赫兹）。TP对应于整体心率变异性，LF对应交感和副交感神经活动，HF仅对应副交感神经活动。仰卧位时TP（次/分钟²）的中位数（第25、75百分位数）为32.60（23.12，59.90），显著高于俯卧位的25.87（14.94，35.57）。同样，仰卧位时LF（次/分钟²）为13.82（8.63，23.31），显著高于俯卧位的9.79（5.46，14.33）。HF未见显著差异。我们得出结论，俯卧位与心率变异性降低相关，可能交感神经张力降低，这意味着该体位下自主神经稳定性降低。
