この研究は、ヒトボランティアを用いた3つのアプローチにより、60Hz磁界ばく露と心拍変動性（HRV）の関連について調べた。第1は、先行研究よりはるかに高い磁界レベル（合成磁束密度 127.3 µT）にばく露中の男性（n = 24）における心臓の自律神経制御について、HRVスペクトル分析を用いて指標化した。第2は、同じ個人でのHRV指標を3つのばく露条件で比較した（間欠的および連続的ばく露、および無ばく露対照）。第3は、心電図データを分析して、心臓周期との関連で見た磁界のオンオフ切替えの正確なタイミングが、ヒトの心拍リズムの位相リセットをもたらすか否かを調べた。その結果、HRV測定値は、対照条件と比較して、いずれのばく露条件によっても変化せず、また、位相リセットのメカニズムに関する証拠も見出されなかった、と報告している。
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The effects of exposure of subjects to a 50 Hz magnetic field on the heart rate variability should be investigated.
Sastre et al. 1998 found significant alterations in the heart rate variability of men by intermittent exposure to an magnetic field. These results should be verified and specified.
24 healthy young men (though only data of 18 were analyzed) participated in 3 over-night sessions, respectively. Each session was randomly dedicated to either 1) continuous exposure, 2) intermittent exposure or 3) sham exposure and each subject served as its own control. During intermittent exposure, it was analyzed if the precise timing of when the magnetic field switched on or off resulted in phase-resetting of the cardiac rhythm.
|ばく露時間||continuous for 8 hours (from 23.00 pm to 7.00 am)|
|チャンバの詳細||test room (a cube of about 2.4 m side length)|
|ばく露装置の詳細||two Merritt coil systems placed behind the ceiling, walls and floor of the test room; the test person slept on a bed in the room with his body oriented north-south; the horizontal axis of the uniform field (about 2.5% deviation) was oriented north-south and the vertical axis was perpendicular to the floor|
|Sham exposure||A sham exposure was conducted.|
There were no effects of continuous or intermittent exposure to 50 Hz magnetic field on the heart rate variability found in subjects.
The authors conclude that further research is needed to resolve the differences between the present and the earlier laboratory based studies and to determine if cardiac rhythm disturbances are associated with exposure to the more complex magnetic fields found in the man-made environment.