研究のタイプ: 医学／生物学の研究 (experimental study)

[低強度電磁エネルギーによる心臓機能の変化] med./bio.

Modification of the heart function with low intensity electromagnetic energy

著者: Frey AH, Eichert ES
掲載誌: J Bioelectricity 1986; 5 (2): 201-210
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カエルの3グループをパルス変調電磁（EM）エネルギーにばく露させた。1グループは、ばく露パルスをR波の上昇と同期させて、ばく露と擬似ばく露10分間の交代で行った。2つ目のグループは同じ方法でT波と同期させた。3つ目のグループは擬似ばく露群であった。データは、心臓の鼓動変化が3uW/cm2の入射平均電力密度で変化したことを示している。心臓のサイクルとエネルギーパルスの同期の結果である。

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研究目的（著者による）

To investigate if a microwave exposure is able to alter the heart rate of the frog Rana pipiens in vivo.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1.25 GHz
Modulation type: pulsed
ばく露時間: intermittent, 10 min on/off, for up to 120 min

ばく露1

主たる特性
周波数 1.25 GHz
タイプ
  • electromagnetic field
ばく露時間 intermittent, 10 min on/off, for up to 120 min
Modulation
Modulation type pulsed
Pulse width 5 µs
Repetition frequency 1 Hz
ばく露装置
ばく露の発生源／構造
Distance between exposed object and exposure source 90 cm
チャンバの詳細 The frogs were positioned on a polystyrene surface, restrained at arms and legs by plastic clips, and placed on a table made of RF-absorbing material approx. 90 cm below the open end of a standard gain horn antenna.
ばく露装置の詳細 The frog's ECG was monitored with a pair of electrodes that were positioned perpendicular to the EF. The exposure pulses were synchronised with the rise of the R-wave or of the T-wave.
Sham exposure A sham exposure was conducted.
Additional information Alternating on and off periods were repeated until the heartbeat ceased. Generally the heart remained active for ten to twelve 10-min periods. Half of the exposures started with EMF off, the other half with EMF on. Two non-exposure conditions were used for control: In one condition, the preparation was shielded from the energy with a piece of RF-absorber, in the other one, the energy was delivered to a dummy load rather than to the horn antenna.
パラメータ
測定量 値 種別 Method Mass 備考
電力密度 3 µW/cm² mean 測定値 - -
測定および計算の詳細

The incident power density was measured before and after each session using a quarter-wave dipole connected to a thermistor mount and a power meter. Measurements showed that the EMF energy was evenly distributed at the heart's level.

ばく露を受けた生物:

方法 影響評価項目／測定パラメータ／方法

研究対象とした生物試料:
研究対象とした臓器系:
調査の時期:
  • ばく露中

研究の主なアウトカム（著者による）

The heart rate of an in vivo preparation can be influenced by exposure to low-intensity pulsed electromagnetic radiation. The exposure has to be for more than one minute to reveal significant effects.

研究の種別:

研究助成

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