FURTHER MAPPING OF THE NATALITY CHRONOME IN TODA CITY (JAPAN) MATERNITY HOSPITAL.

In order to investigate any circannual and/or circaseptan variations in birth incidence and birth weight in Toda City (Japan), data on 4,411 consecutive births were obtained from the city's Maternity Hospital between 1 Jan 1999 and 31 Dec 2001. Data were analysed by cosinor separately for babies with birth weights in given ranges, and separately for boys and girls born at different gestational ages. A circannual rhythm was detected with statistical significance (P=0.

Heart rate variability in normotensive healthy children with aging.

Although the heart rate variability (HRV) values in adults decrease with aging, those in children show a variety of changes. The present study was designed to investigate the relationship between HRV and aging, physique and blood pressure in 70 healthy male school children, between 6 and 12 years of age. The subjects were divided into 3 age groups (6-7, 8-9 and 10-12 years) and 3 other groups according to physique (thin, under -10%; normal, -10-20% and obese, over 20% of obesity index).

Seasonal variation in 1/f fluctuations of heart rate in asthmatic children.

We have reported previously that asthmatic children have a seasonal variation in the power spectrum in the low frequency, LF (0.04-0.15 Hz) and high frequency, HF (0.

Seasonal variation in heart rate variability in asthmatic children.

Asthma is a "seasonal disease" with symptoms either aggravated by environmental changes during specific seasons or prevalent at certain times of the year for other reasons. We examined whether the heart rate variability (HRV) of asthmatic children changes by season. The HRV during a portion of one night (00:00-04:00) and day (12:00-16:00) and the entire 24h period (00:00-24:00) during each of the four seasons was analyzed.

Can heart rate variability predict sudden death? A case of sudden death in a child with severe coronary sequelae of Kawasaki disease.

We report the heart rate variability (HRV) of a child aged 11 years. Arrhythmia was the suspected cause of sudden death after 10 years of therapy for Kawasaki disease. The linear methods failed to show any features of the HRV that could have predicted the patient's sudden death, but the fractal scaling as a nonlinear method had suddenly decreased from 5.