Makarov L M
Moscow NII of Pediatrics and Pediatric Surgery, Department of Health, Russia.
Klin Med (Mosk). 1997;75(2):22-6.
To study the effect of geomagnetic field (GMF) on circadian rhythm of the heart the author has examined 23 healthy children aged 5-16 years (mean age 12 +/- 4.8). All the examinees have undergone 24-h Holter monitoring with assessment of circadian fluctuations n cardiac rhythm variability (CRV). The data obtained on the parameters Mean, SDNN, SDNN = i, SDANN = i, rMSSD and pNN50 were compared to circadian fluctuations of 3-h indices GMF Ap-index in the test day with estimation of paired correlation index (r). Positive and negative relations between CRV and GMF changes were found in 6 and 8 children, respectively. Groups of GMF-sensitive and GMF-negative children were formed. At 10-year follow-up 3 of 7 GMF-sensitive and 6 of 9 GMF-resistant children developed nonspecific diseases. It is suggested that GMF may have a synchronizing effect on cardiac circadian rhythm. The response of cardiac rhythm to fluctuations of GMF is thought an individual chronotype of the body. GMF-resistant group is characterized by self-regulation of cardiac rhythm which determines reduced availability of exogenic synchronizing effects of GMF.
为研究地磁场（GMF）对心脏昼夜节律的影响，作者对23名5至16岁（平均年龄12±4.8岁）的健康儿童进行了检查。所有受检者均接受了24小时动态心电图监测，以评估心脏节律变异性（CRV）的昼夜波动情况。将获得的平均、SDNN、SDNN=i、SDANN=i、rMSSD和pNN50参数数据与测试日3小时GMF Ap指数的昼夜波动情况进行比较，并估计配对相关指数（r）。分别在6名和8名儿童中发现CRV与GMF变化之间存在正相关和负相关关系。由此形成了GMF敏感组和GMF抵抗组儿童。在10年随访中，7名GMF敏感儿童中有3名，9名GMF抵抗儿童中有6名患上了非特异性疾病。提示GMF可能对心脏昼夜节律具有同步作用。心脏节律对GMF波动的反应被认为是机体的一种个体昼夜类型。GMF抵抗组的特点是心脏节律自我调节，这决定了GMF外源性同步作用的有效性降低。
