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Effects of a Forest Walk on Urinary Dityrosine and Hexanoyl-Lysine in Young People: A Pilot Study

Author

Listed:
  • Ai Yamada

    (Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan)

  • Yoshiko Sato

    (Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan
    Wakayama Shin-ai Junior and Senior High School, Wakayama 640-8151, Japan)

  • Tokushi Horike

    (Public Health Lab, Okayama 700-0973, Japan)

  • Masamitsu Miyanaga

    (Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan)

  • Da-Hong Wang

    (Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan)

Abstract

A few studies indicate exposure to forests may alleviate oxidative stress in the body. However, more evidence is needed to support this potentiality. The purpose of the current study aimed at examining whether there is any difference in urinary levels of oxidatively modified proteins or lipids—dityrosine (DT) and hexanoyl-lysine (HEL), respectively, after a forest or urban walk. The study was performed on 29 university students who took part in forest walks (Shinjo Village) in Okayama Prefecture of Japan and on 42 university students who took part in urban walks in the downtown area of Okayama City. Urine samples before and after the walks were analyzed for DT and HEL excretion. Air phytoncides during the walks were also measured. We found a decreased tendency in urinary DT and HEL ( p < 0.05) in most participants after the forest walks, but not after the urban walks. We further found the total levels of air phytoncides in the forest field were 1.50 times higher compared with those in the urban field. This study suggests the possibility that regular immersion in a forest environment might contribute toward weakening of the oxidative modifications of proteins or lipids in the body.

Suggested Citation

  • Ai Yamada & Yoshiko Sato & Tokushi Horike & Masamitsu Miyanaga & Da-Hong Wang, 2020. "Effects of a Forest Walk on Urinary Dityrosine and Hexanoyl-Lysine in Young People: A Pilot Study," IJERPH, MDPI, vol. 17(14), pages 1-10, July.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:14:p:4990-:d:383051
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    References listed on IDEAS

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    1. Da-Hong Wang & Ai Yamada & Masamitsu Miyanaga, 2018. "Changes in Urinary Hydrogen Peroxide and 8-Hydroxy-2?-Deoxyguanosine Levels after a Forest Walk: A Pilot Study," IJERPH, MDPI, vol. 15(9), pages 1-9, August.
    2. Margaret M. Hansen & Reo Jones & Kirsten Tocchini, 2017. "Shinrin-Yoku (Forest Bathing) and Nature Therapy: A State-of-the-Art Review," IJERPH, MDPI, vol. 14(8), pages 1-48, July.
    3. Su Geun Im & Han Choi & Yo-Han Jeon & Min-Kyu Song & Won Kim & Jong-Min Woo, 2016. "Comparison of Effect of Two-Hour Exposure to Forest and Urban Environments on Cytokine, Anti-Oxidant, and Stress Levels in Young Adults," IJERPH, MDPI, vol. 13(7), pages 1-11, June.
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