長文読解（人文系・自然科学系の文章）- 問題21

The concept of "forest bathing," known as shinrin-yoku in Japanese, has gained significant attention in recent years as a scientifically-backed approach to improving mental and physical health. Developed in Japan during the 1980s, this practice involves immersing oneself mindfully in a forest environment, engaging all five senses rather than simply hiking or exercising outdoors.
Research conducted by Japanese scientists has demonstrated remarkable physiological benefits of forest bathing. Studies show that spending time among trees can reduce cortisol levels by up to 50%, lower blood pressure, and boost immune system function by increasing natural killer cell activity. The practice also significantly decreases symptoms of anxiety and depression while improving overall mood and cognitive performance.
The therapeutic effects are attributed to phytoncides, antimicrobial compounds released by trees and plants. When inhaled, these natural chemicals trigger positive responses in the human body, including reduced stress hormones and enhanced immune function. Additionally, the visual complexity and natural sounds of forests activate the parasympathetic nervous system, promoting relaxation and restoration.
Today, forest bathing programs are being implemented worldwide, with medical professionals in countries like South Korea, Finland, and the United States prescribing "nature therapy" as a complementary treatment for various health conditions. This growing recognition highlights the profound connection between human well-being and natural environments.