Cohen D, Palti Y, Cuffin B N, Schmid S J
Proc Natl Acad Sci U S A. 1980 Mar;77(3):1447-51. doi: 10.1073/pnas.77.3.1447.
The magnetic fields produced by naturally occurring steady currents in the body were measured by using a new magnetic gradiometer in a magnetically shielded room. A field of 0.1 micro G/cm with reproducible pattern was seen over the head and over the limbs, whereas the field over the torso proper was weaker (except over the abdomen). Most of the field over the head is produced by electrical sources associated with the hair follicles of the scalp; this field is produced only as a response to touching or pressing the scalp, in regions where the hair is dense. Most of the field over the limbs is produced by electrical sources associated with the muscles. The field over the forearm, studied in detail, was often present spontaneously; when absent, it could be induced by mild twisting and rubbing. On the basis of auxiliary experiments involving electrolytes, a general mechanism for generation of steady current in the body is suggested. In this mechanism, the steady current is generated by a nonclosed or a nonuniform polarized layer across an elongated semipermeable membrane such as a muscle fiber; the nonuniform polarization is due to a gradient of extracellular K+ along the membrane.
在磁屏蔽室内，使用一种新型磁梯度仪测量了人体中自然产生的稳定电流所产生的磁场。在头部和四肢上方观察到具有可重复模式的0.1微高斯/厘米的磁场，而躯干本身上方的磁场较弱（腹部除外）。头部上方的大部分磁场是由与头皮毛囊相关的电源产生的；该磁场仅在头发密集的区域，作为对触摸或按压头皮的反应而产生。四肢上方的大部分磁场是由与肌肉相关的电源产生的。对前臂上方的磁场进行了详细研究，其通常会自发出现；当不存在时，可以通过轻微扭转和摩擦来诱发。基于涉及电解质的辅助实验，提出了一种人体中稳定电流产生的一般机制。在该机制中，稳定电流由穿过细长半透膜（如肌纤维）的非封闭或非均匀极化层产生；非均匀极化是由于细胞外钾离子沿膜的梯度所致。
