この研究は、健常なボランティア6人（28-52歳；平均35歳）の前腕部正中神経に電力周波磁界ばく露を行い、神経伝導機構の変化の可能性を調べた。磁界ばく露は、50Hzヘルムホルツコイルに前腕を通して行われ、磁界強度は約1mTとした。磁界ばく露前、磁界ばく露実験中、ばく露終了後の3回、正中神経の遠位部または近位部にそれぞれ刺激頻度2Hz、パルス幅0.2msの最大上刺激を与え、そのときの短母指外転筋（APB）の応答（活動電位振幅）を記録した。その結果、（遠位刺激時の振幅）／（近位刺激時の振幅）の比は、ばく露後に比べばく露前では有意に低かったことを報告している。
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To examine whether exposure of humans to 50 Hz-magnetic fields influences the nerve conduction mechanism in the arm.
6 healthy volunteers were examined. Measurements were performed three times for every proband: 1.) before exposure, 2.) during exposure and 3.) after exposure. The median nerve from the right arm was stimulated on the elbow and on the wrist with pulses (0.2 ms, 2 Hz). The motor responses were recorded from the Abductor pollicis brevis muscle (abductor of the thumb), using surface electrodes.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
50 Hz
ばく露時間:
continuous for 5 min
|
|
| 周波数 | 50 Hz |
|---|---|
| タイプ |
|
| 波形 |
|
| ばく露時間 | continuous for 5 min |
| ばく露の発生源／構造 | |
|---|---|
| ばく露装置の詳細 | pair of Helmholtz coils with a diameter of 10 cm and 220 turns of 0.8 mm gauge copper wire placed parallel to the table, mounted on a plastic frame, 15 cm apart, connected in series; arm of the test person placed in the axial position in the coils |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 1 mT | - | 測定値および計算値 | - | - |
No significant differences were seen between the measurements during the exposure and the measurements before and after the exposure. However, a significant decrease in the stimulus conduction was observed in the measurements after the exposure when compared to the measurements before the exposure.
The authors conclude that these results could indicate a potential deleterious effect of 50 Hz-magnetic field exposure on human nerves.
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