本研究では、α帯域の電気EEG活動（8-13Hz）及び、二重盲検の無作為擬似対照群において、50Hz、40、80μTの磁界に頭部を90分ばく露した後の40名の健康な男性の痛覚への影響を分析した。心臓血管系の調整は、痛みの変調に機能的に関係があるので、処置時に血圧（BP）と心拍（HR）も測定した。80μTでの磁気処理後のα活動は擬似群と比べて2倍にあった。40μTの磁気処理後の痛覚閾値は、擬似処理後と比べ有意に低かった。BPとHRの影響は見られなかった。結論として、得られた結果はオピオイド系を介しての感覚系のゲート変調で説明でき、ひいては磁界に影響を受けていることが言える。
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The effects of exposure of subjects to a 50 Hz magnetic field on brain activity, nociception and cardiovascular parameters should be investigated.
Some studies suggest effects of 50 Hz magnetic field exposure on brain activity and nociception, which should be verified. Since cardiovascular regulation is functionally related to pain modulation, some relevant cardiovascular parameters were measured additionally.
40 healthy male subjects participated in the study. Subjects were randomly assigned to one of the two exposure intensity groups (n=20 each; however, only data from 10 subjects from group 1 and 15 subjects from group 2 were analyzed): 1) 40 µT magnetic field and 2) 80 µT magnetic field. Each volunteer was investigated during two sessions at an interval of 1-2 weeks: one exposure session and one sham exposure session. Exposure and sham exposure were conducted in a random order (cross-over study).
| 周波数 | 50 Hz |
|---|---|
| タイプ |
|
| 波形 |
|
| ばく露時間 | continuous for 90 min |
| ばく露の発生源／構造 | |
|---|---|
| チャンバの詳細 | subject was comfortably seated in a quiet room |
| ばく露装置の詳細 | 2 circular coils, similar to Helmholtz coils (44 cm in diameter, each composed of an aluminum ring on which 50 copper coils [0.8 mm diameter] were winded), produced the magnetic field; the coils were positioned around the head of the subject with the head at the center of the coils; the subject was invited to read a magazine during exposure |
| Sham exposure | A sham exposure was conducted. |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 40 µT | peak | 測定値 | - | - |
| 周波数 | 50 Hz |
|---|---|
| タイプ |
|
| 波形 |
|
| ばく露時間 | continuous for 90 min |
| ばく露の発生源／構造 |
|
|---|---|
| Sham exposure | A sham exposure was conducted. |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 80 µT | peak | 測定値 | - | - |
Brain activity in the alpha wave band was significantly increased after exposure to the 80 µT magnetic field (group 2) compared to the sham exposure.
The pain threshold was significantly lower after exposure to the 40 µT magnetic field (group 1) compared to the sham exposure.
No differences were found in blood pressure, heart rate and hormonal blood levels between exposure and sham exposure in both groups.
The authors conclude, that exposure of subjects to a 50 Hz magnetic field might affect the alpha wave brain activity and nociception, though it is uncertain whether both effects are linked.
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