長文読解（人文系・自然科学系の文章）- 問題74

The concept of "forest bathing" or shinrin-yoku, developed in Japan during the 1980s, has gained international recognition as a powerful method for improving mental and physical health. This practice involves spending mindful time in forest environments, engaging all five senses to connect deeply with nature. Unlike hiking or other vigorous outdoor activities, forest bathing emphasizes slow, contemplative movement and conscious breathing.
Scientific research has validated many of the claimed benefits of this ancient practice. Studies conducted by Dr. Qing Li at Nippon Medical School revealed that spending time in forests can significantly boost immune system function by increasing natural killer (NK) cell activity by up to 50%. Additionally, forest environments release aromatic compounds called phytoncides, which trees emit to protect themselves from insects and bacteria.
The psychological benefits are equally impressive. Research indicates that forest bathing can reduce cortisol levels, lower blood pressure, and decrease symptoms of anxiety and depression. A 2019 study involving 585 participants found that just 15 minutes of forest exposure led to measurable improvements in mood and stress reduction. Today, forest bathing programs are being implemented in hospitals, schools, and corporate wellness initiatives worldwide.