The Influence On The Transmembrane Potential Of The Myocardial Cells And Human Longevity During The Exposure Of The Electromagnetic Field

With the popularize of various household appliances, office and mobile communication devices, the low intensity magnetic field (mainly composed of geomagnetic field, power frequency and radio frequency magnetic field) is getting stronger. The problem whether the electromagnetic field has effects on human health and longevity draws great public attention. As heart is the motor of body, the membrane voltage of myocardial cells is an important value to reflect the cells’life activity and function state. The change of transmembrane voltage induced on myocardial cell will cause the ion movement, and the equilibrium state of ion distribution which is necessary to maintain its normal life activity is broken. Then the physiological and biochemical state which is beneficial or detrimental to its survival will be changed, so that may cause positive or negative effect to human health. Therefore, it is necessary to build an analytical models for membrane voltage of a myocardial cell exposed to electric field. To grasp the change law of membrane voltage makes it significant to study the effects on human health and longevity. Thus, in this paper, based on the analytical models for membrane voltage and membrane power dissipation, we research Bama, which is the world famous longevity county, to discuss the effects on human health and longevity exposed to electromagnetic field. This will provide theoretical and practical significance for studying and exploring the bioelectromagnetic effects on human health and longevity. The main researches of this paper are as follows:(1) Firstly we establish a physical model of a cylindrical myocardial cell, and then build an analytical model for transmembrane voltage induced on cell exposed to a dc electric field. The model shows that the change of membrane voltage depends on the intensity of dc electric field, the location of the membrane site under consideration, the radius of cell, the thickness of membrane, and the conductivity of cytoplasm, membrane and extracellular fluid.(2) Then we build some analytical models for membrane voltage of a cell exposed to an ac electric field. The models show that the cell membrane voltage changed depending on some parameters as the model in dc field, as well as the permittivity of the membrane and the frequency of the ac field.(3) Based on the analytical models of transmembrane voltage builded in this paper, we study the variation of distributed power dissipation in the membrane of myocardial cell. The equations show that the distributed power dissipation increases with increase of the amplitude of external dc field. For an ac field, the distributed power dissipation changes smaller with the low frequency, but the dielectric loss rapid increases when the frequency increase to a threshold frequency. This model provides a theory basis for studying the mechanism of bioelectromagnetic effects of myocardial cells. (4) With on-the-spot-investigation and collection of the date containing geomagnetic intensity and longevity rate of the villages in Bama country, we found that Bama country includes longevity colony area and non-longevity colony area. Longevity areas mostly distribute in tor with higher geomagnetic field and non-longevity areas mostly in slope area with smaller geomagnetic field intensity. The results show that the geomagnetic field may be an important influence factor to human health and longevity. Moreover, with the widely use of home appliances, the number of old people suffering from cardiovascular disease increase and the longevity rate decreases in some longevity villages of Bama. This phenomenon prompts that a certain amount of power frequency electromagnetic field may have a negative impact on human. Lastly, based on some thesis such as the magnetization characteristic, the window characteristic of bioeletromagnetic effect, and the influence on the membrane voltage induced on a myocardial cell and the movement of transmembrane ion exposed to electromagnetic field, we discuss the influencing mechanism between electromagnetic field and the human health and longevity in Bama. It will provide meaningful data for human to study the biological effect of electromagnetic field.