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Effects of Forest-Based Interventions on Mental Health: A Meta-Analysis of Randomized Controlled Trials

Author

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  • Mi-Jung Kang

    (College of Nursing, Eulji University, 712, Dongil-ro, Uijeongbu-si 11759, Korea)

  • Hyun-Sun Kim

    (College of Nursing, Eulji University, 712, Dongil-ro, Uijeongbu-si 11759, Korea)

  • Ji-Yeon Kim

    (College of Nursing, Eulji University, 712, Dongil-ro, Uijeongbu-si 11759, Korea)

Abstract

Forest-based interventions are a promising alternative therapy for enhancing mental health. The current study investigated the effects of forest therapy on anxiety, depression, and negative and positive mental condition through a meta-analysis of recent randomized controlled trials, using the PRISMA guideline. Of 825 articles retrieved from databases including PubMed, EMBASE, CINAHL, Cochrane, and PsycINFO, 6 met the inclusion criteria. The results of this study showed that forest-based interventions improved the mental health of participants in the intervention groups when compared to those in the control groups. Thirty-four outcome variables were analyzed from six studies. The overall effect size of the forest therapy programs was 1.25 (95% CI = 0.93–1.57, p < 0.001), which was large and statistically significant. These findings imply that forest-based interventions can improve mental health as a nonpharmacological intervention. This study is significant in that it is a meta-analysis of mental health that included only high-quality domestic and international RCTs. In future studies, more RCTs related to various forest interventions and studies involving many participants should be undertaken, which will complement heterogeneity in future meta-analysis studies.

Suggested Citation

  • Mi-Jung Kang & Hyun-Sun Kim & Ji-Yeon Kim, 2022. "Effects of Forest-Based Interventions on Mental Health: A Meta-Analysis of Randomized Controlled Trials," IJERPH, MDPI, vol. 19(8), pages 1-13, April.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:8:p:4884-:d:795878
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    References listed on IDEAS

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    1. Hyeyun Kim & Jayoung Kim & Hyo Jin Ju & Bong Jin Jang & Tae Kyu Wang & Yeong In Kim, 2020. "Effect of Forest Therapy for Menopausal Women with Insomnia," IJERPH, MDPI, vol. 17(18), pages 1-8, September.
    2. Ernest Bielinis & Jenni Simkin & Pasi Puttonen & Liisa Tyrväinen, 2020. "Effect of Viewing Video Representation of the Urban Environment and Forest Environment on Mood and Level of Procrastination," IJERPH, MDPI, vol. 17(14), pages 1-23, July.
    3. Federica Zabini & Lorenzo Albanese & Francesco Riccardo Becheri & Gioele Gavazzi & Fiorenza Giganti & Fabio Giovanelli & Giorgio Gronchi & Andrea Guazzini & Marco Laurino & Qing Li & Tessa Marzi & Fra, 2020. "Comparative Study of the Restorative Effects of Forest and Urban Videos during COVID-19 Lockdown: Intrinsic and Benchmark Values," IJERPH, MDPI, vol. 17(21), pages 1-13, October.
    4. Michele Antonelli & Davide Donelli & Grazia Barbieri & Marco Valussi & Valentina Maggini & Fabio Firenzuoli, 2020. "Forest Volatile Organic Compounds and Their Effects on Human Health: A State-of-the-Art Review," IJERPH, MDPI, vol. 17(18), pages 1-36, September.
    5. Insook Lee & Heeseung Choi & Kyung-Sook Bang & Sungjae Kim & MinKyung Song & Buhyun Lee, 2017. "Effects of Forest Therapy on Depressive Symptoms among Adults: A Systematic Review," IJERPH, MDPI, vol. 14(3), pages 1-18, March.
    6. Kathleen L. Wolf & Sharon T. Lam & Jennifer K. McKeen & Gregory R.A. Richardson & Matilda van den Bosch & Adrina C. Bardekjian, 2020. "Urban Trees and Human Health: A Scoping Review," IJERPH, MDPI, vol. 17(12), pages 1-30, June.
    7. Marita Stier-Jarmer & Veronika Throner & Michaela Kirschneck & Gisela Immich & Dieter Frisch & Angela Schuh, 2021. "The Psychological and Physical Effects of Forests on Human Health: A Systematic Review of Systematic Reviews and Meta-Analyses," IJERPH, MDPI, vol. 18(4), pages 1-39, February.
    8. Jin Gun Kim & Tae Gyu Khil & Youngsuwn Lim & Kyungja Park & Minja Shin & Won Sop Shin, 2020. "The Psychological Effects of a Campus Forest Therapy Program," IJERPH, MDPI, vol. 17(10), pages 1-11, May.
    9. Hiroko Ochiai & Harumi Ikei & Chorong Song & Maiko Kobayashi & Ako Takamatsu & Takashi Miura & Takahide Kagawa & Qing Li & Shigeyoshi Kumeda & Michiko Imai & Yoshifumi Miyazaki, 2015. "Physiological and Psychological Effects of Forest Therapy on Middle-Aged Males with High-Normal Blood Pressure," IJERPH, MDPI, vol. 12(3), pages 1-11, February.
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    Cited by:

    1. Poung-Sik Yeon & In-Ok Kim & Si-Nae Kang & Nee-Eun Lee & Ga-Yeon Kim & Gyeong-Min Min & Chung-Yeub Chung & Jung-Sok Lee & Jin-Gun Kim & Won-Sop Shin, 2022. "Effects of Urban Forest Therapy Program on Depression Patients," IJERPH, MDPI, vol. 20(1), pages 1-16, December.
    2. Vito Imbrenda & Rosa Coluzzi & Francesca Mariani & Bogdana Nosova & Eva Cudlinova & Rosanna Salvia & Giovanni Quaranta & Luca Salvati & Maria Lanfredi, 2023. "Working in (Slow) Progress: Socio-Environmental and Economic Dynamics in the Forestry Sector and the Contribution to Sustainable Development in Europe," Sustainability, MDPI, vol. 15(13), pages 1-21, June.
    3. Elena Bermejo-Martins & María Pueyo-Garrigues & María Casas & Raúl Bermejo-Orduna & Ana Villarroya, 2022. "A Forest Bathing Intervention in Adults with Intellectual Disabilities: A Feasibility Study Protocol," IJERPH, MDPI, vol. 19(20), pages 1-12, October.

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