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Population-Based Study on the Effect of a Forest Environment on Salivary Cortisol Concentration

Author

Listed:
  • Hiromitsu Kobayashi

    (Department of Nursing, Ishikawa Prefectural Nursing University, 1-1 Gakuendai, Kahoku, Ishikawa 929-1210, Japan)

  • Chorong Song

    (Center for Environment, Health, and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan)

  • Harumi Ikei

    (Center for Environment, Health, and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan
    Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan)

  • Bum-Jin Park

    (Department of Environment and Forest Resources, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea)

  • Juyoung Lee

    (Department of Landscape Architecture, Hankyong National University, 327 Jungang-ro, Anseong-si, Gyeonggi-do 17579, Korea)

  • Takahide Kagawa

    (Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan)

  • Yoshifumi Miyazaki

    (Center for Environment, Health, and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan)

Abstract

The purpose of this study was to evaluate the effect of a forest environment on salivary cortisol concentration, particularly on the characteristics of its distribution. The participants were 348 young male subjects. The experimental sites were 34 forests and 34 urban areas across Japan. The subjects viewed the landscape (forest or urban environment) for a period of 15 min while sitting in a chair. Saliva was sampled from the participants at the end of this 15-min period and then analyzed for cortisol concentration. Differences in the skewness and kurtosis of the distributions between the two environments were tested by performing a permutation test. The cortisol concentrations exhibited larger skewness (0.76) and kurtosis (3.23) in a forest environment than in an urban environment (skewness = 0.49; kurtosis = 2.47), and these differences were statistically significant. The cortisol distribution exhibited a more peaked and longer right-tailed curve in a forest environment than in an urban environment.

Suggested Citation

  • Hiromitsu Kobayashi & Chorong Song & Harumi Ikei & Bum-Jin Park & Juyoung Lee & Takahide Kagawa & Yoshifumi Miyazaki, 2017. "Population-Based Study on the Effect of a Forest Environment on Salivary Cortisol Concentration," IJERPH, MDPI, vol. 14(8), pages 1-9, August.
    • Handle: RePEc:gam:jijerp:v:14:y:2017:i:8:p:931-:d:108784
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    References listed on IDEAS

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    1. Hiroko Ochiai & Harumi Ikei & Chorong Song & Maiko Kobayashi & Takashi Miura & Takahide Kagawa & Qing Li & Shigeyoshi Kumeda & Michiko Imai & Yoshifumi Miyazaki, 2015. "Physiological and Psychological Effects of a Forest Therapy Program on Middle-Aged Females," IJERPH, MDPI, vol. 12(12), pages 1-11, December.
    2. Juyoung Lee & Bum-Jin Park & Tatsuro Ohira & Takahide Kagawa & Yoshifumi Miyazaki, 2015. "Acute Effects of Exposure to a Traditional Rural Environment on Urban Dwellers: A Crossover Field Study in Terraced Farmland," IJERPH, MDPI, vol. 12(2), pages 1-20, February.
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    5. Phipson Belinda & Smyth Gordon K, 2010. "Permutation P-values Should Never Be Zero: Calculating Exact P-values When Permutations Are Randomly Drawn," Statistical Applications in Genetics and Molecular Biology, De Gruyter, vol. 9(1), pages 1-16, October.
    6. Kim, Tae-Hwan & White, Halbert, 2004. "On more robust estimation of skewness and kurtosis," Finance Research Letters, Elsevier, vol. 1(1), pages 56-73, March.
    7. Chorong Song & Harumi Ikei & Yoshifumi Miyazaki, 2016. "Physiological Effects of Nature Therapy: A Review of the Research in Japan," IJERPH, MDPI, vol. 13(8), pages 1-17, August.
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    Cited by:

    1. Quan Qiu & Ling Yang & Mei He & Wen Gao & Harrison Mar & Jiyue Li & Guangyu Wang, 2022. "The Effects of Forest Therapy on the Blood Pressure and Salivary Cortisol Levels of Urban Residents: A Meta-Analysis," IJERPH, MDPI, vol. 20(1), pages 1-20, December.
    2. Yuqian Wang & Huahong Qu & Tong Bai & Qibing Chen & Xi Li & Zhenghua Luo & Bingyang Lv & Mingyan Jiang, 2021. "Effects of Variations in Color and Organ of Color Expression in Urban Ornamental Bamboo Landscapes on the Physiological and Psychological Responses of College Students," IJERPH, MDPI, vol. 18(3), pages 1-19, January.
    3. Erica R. Timko Olson & Margaret M. Hansen & Amber Vermeesch, 2020. "Mindfulness and Shinrin-Yoku: Potential for Physiological and Psychological Interventions during Uncertain Times," IJERPH, MDPI, vol. 17(24), pages 1-13, December.
    4. Chorong Song & Harumi Ikei & Takahide Kagawa & Yoshifumi Miyazaki, 2019. "Effects of Walking in a Forest on Young Women," IJERPH, MDPI, vol. 16(2), pages 1-12, January.
    5. Sus Sola Corazon & Ulrik Sidenius & Dorthe Varning Poulsen & Marie Christoffersen Gramkow & Ulrika Karlsson Stigsdotter, 2019. "Psycho-Physiological Stress Recovery in Outdoor Nature-Based Interventions: A Systematic Review of the Past Eight Years of Research," IJERPH, MDPI, vol. 16(10), pages 1-21, May.
    6. Don-Gak Lee & Mi-Mi Lee & Young-Mi Jeong & Jin-Gun Kim & Yung-Kyoon Yoon & Won-Sop Shin, 2021. "Influence of Forest Visitors’ Perceived Restorativeness on Social–Psychological Stress," IJERPH, MDPI, vol. 18(12), pages 1-14, June.
    7. Dannie Fu & Natalia Incio Serra & Hubert Mansion & Emilia Tamko Mansion & Stefanie Blain-Moraes, 2022. "Assessing the Effects of Nature on Physiological States Using Wearable Technologies," IJERPH, MDPI, vol. 19(3), pages 1-16, January.
    8. Albert Bach Pagès & Josep Peñuelas & Jana Clarà & Joan Llusià & Ferran Campillo i López & Roser Maneja, 2020. "How Should Forests Be Characterized in Regard to Human Health? Evidence from Existing Literature," IJERPH, MDPI, vol. 17(3), pages 1-15, February.
    9. Megan E. Gerdes & Lucy A. Aistis & Naomi A. Sachs & Marcus Williams & Jennifer D. Roberts & Rachel E. Rosenberg Goldstein, 2022. "Reducing Anxiety with Nature and Gardening (RANG): Evaluating the Impacts of Gardening and Outdoor Activities on Anxiety among U.S. Adults during the COVID-19 Pandemic," IJERPH, MDPI, vol. 19(9), pages 1-20, April.
    10. Ji-Eun Baek & Jin-Hwa Jung & Ho-Jin Shin & Sung-Hyeon Kim & Si-Yoon Sung & Su-Jin Park & Suk-Chan Hahm & Hwi-Young Cho & Min-Goo Lee, 2022. "Effects of Forest Healing Anti-Aging Program on Psychological, Physiological, and Physical Health of Older People with Mild Cognitive Impairment," IJERPH, MDPI, vol. 19(8), pages 1-17, April.

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