下肢固定による足底部の血行不良に対する交流磁場曝露の即時効果

抄録

In recent years, alternating current (AC) 50/60 Hz magnetic therapy has attracted attention for improving blood circulation and recovery from fatigue. However, its effectiveness in treating bedsores (pressure sores and ulcers) in bedridden patients has not yet been fully verified. In this study, we investigated the effect of an AC magnetic field (50 Hz, B_rms127 mT) on poor blood circulation induced in the rearfoot region of the sole near the heel of the left foot. Ankle weights (3 kg) were attached to the left lower leg, to reproduce the conditions for early stage of pressure injury. Skin blood flow volume in the sole was monitored for 70 min using 2D laser speckle flowmetry in six healthy adult males recruited for this study. Each participant was positioned supine on a bed, and the left lower leg was compressed and immobilized with ankle weights for 60 min, causing a decrease in skin blood flow volume. The heel and ankle were exposed to a magnetic field for 10 min, and the rate of change in the skin blood flow volume in the rearfoot region of the sole near the heel was analyzed. The results indicated that the magnetic field rapidly increased and restored the decreased blood flow volume, and a significant effect was sustained intermittently for 40 min after the end of exposure.