長文読解（人文系・自然科学系の文章）- 問題35

The concept of "forest bathing," known as shinrin-yoku in Japanese, has gained international attention as a scientifically-backed wellness practice. Developed in Japan during the 1980s, this practice involves spending mindful time in forest environments to reduce stress and improve overall health. Unlike hiking or other vigorous outdoor activities, forest bathing emphasizes slow, contemplative engagement with nature through all five senses.
Recent studies have demonstrated significant physiological benefits of this practice. Research conducted at Japanese universities found that participants who spent two hours in forest environments showed measurable decreases in cortisol levels, blood pressure, and heart rate compared to those in urban settings. The practice also increased activity in the parasympathetic nervous system, which promotes relaxation and recovery.
The therapeutic effects are attributed to phytoncides, natural compounds released by trees and plants. These airborne chemicals have antimicrobial properties and appear to boost human immune function. Some studies suggest that regular forest bathing can increase the production of natural killer cells, which play a crucial role in fighting infections and cancer.
Today, forest bathing programs are being implemented in healthcare systems worldwide. Countries like South Korea, Finland, and the United States have established forest therapy centers, recognizing the practice as a legitimate form of preventive medicine that complements traditional medical treatments.