Kamiyama Keizou found coniferous forest contains the high purity of Phytoncides. Such as Japanese cypress mainly contains α-Pinene. Japanese red pine rich contains α-Pinene and α-Terpinene. The foliage releases different concentrations of Phytoncides in a day by the time. The volatile organic compounds content is also according to plant species. So the plant affects different degrees of healing abilities on the medical application.
Forest Therapy is an important supporting treatment. The “Forest Medicine Science” is an interdisciplinary subject from the perspective of medicine to study the functions of forests in the treatment, rehabilitation, health care and recuperation of the human body.
Some studies result that forest therapy can reduce sympathetic activity, increase parasympathetic activity, and reduce the secretion of cortisol, epinephrine, and norepinephrine in saliva, and can stabilize autonomic nervous activity.