JMIR research protocols
July 15, 2024
Takumu Kurosawa, Koichiro Adachi, Ryu Takizawa
6 citations
A randomized controlled trial protocol will test whether brief guided mindfulness meditation or self-compassion meditation delivered by a smartphone app improves mental health and work performance among Japanese employees working more than 20 hours per week, aged 18 to 54, not on leave, and without a current mental disorder diagnosis. The trial will enroll 200 participants, assigning them to a self-compassion meditation course, a mindfulness meditation course, or a waitlist group. Daily guided sessions lasting 6 to 12 minutes over 4 weeks are planned. Primary outcomes are psychological distress and job performance; secondary outcomes include well-being, work engagement, and creativity. Recruitment began December 2022, and as of September 2023, 375 participants have been enrolled; intervention and data collection completed in October 2023.
Journal of medical Internet research
February 2, 2026
Riko Uwagawa, Koichiro Adachi, Mariko Shimoda et al.
An 8-week mindfulness-based self-help intervention delivered via a smartphone app improved life satisfaction and reduced perceived stress, depressive and anxiety symptoms, and trait anger among working women. In a randomized trial with 106 women in the intervention group and 107 in a waitlist control, the app group showed significantly greater life satisfaction and lower depressive and anxiety symptoms after the program. The intervention did not significantly improve work-related, family-related, or work-to-family conflict indicators, suggesting that higher-intensity interventions may be needed for those outcomes.
Stress and health : journal of the International Society for the Investigation of Stress
August 1, 2025
Koichiro Adachi, Ryu Takizawa
A 12-week online-guided mindfulness-based intervention for healthy university students reduced emotional fluctuations and increased relaxation after a single session, though no changes in physiological measures were observed. After 12 weeks, the intervention group showed decreased state anxiety and marginally reduced sympathetic nervous system activation and perceived stress compared to a waitlist control group. The results suggest that the effects of mindfulness meditation on autonomic nerve function may accumulate over time, supporting the preventive potential of online mindfulness programs and the usefulness of pupillometry for monitoring intervention effects.