The nature of lightning discharges which hit human bodies and their injury effects have been studied both experimentally and clinically. It has been clarified that the human body standing outdoors reacts to a lightning discharge as a 300Ω conductive column and is, consequently, an effective target of lightning incidence. When he is struck by lightning, the lightning current flows in two ways, one as the conduction current through his body and the other as the surface discharge currents on various parts of his body surface. While the discharge currents cause merely superficial dermal burns, the conduction current through the body causes fatal effects. When a human body is situated close to a high objects, such as a tree or a pole, the main lightning current flows into his body and also causes fatal effects, in case the objects is struck by lightning. The probability of lightning incidence into the human body is not reduced, when he takes out all metal pieces, nor he wears insulating coats and boots.
　When thunderstorm conditions are anticipated, it is highly dangerous and should be avoided to stay on open field, near bight objects and also in outdoor tents in the same conditions.

DESCENTE SPORTS SCIENCE Vol.9/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE