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Brief Report

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

1
Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan
2
Wakayama Shin-ai Junior and Senior High School, Wakayama 640-8151, Japan
3
Public Health Lab, Okayama 700-0973, Japan
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(14), 4990; https://doi.org/10.3390/ijerph17144990
Received: 3 June 2020 / Revised: 2 July 2020 / Accepted: 7 July 2020 / Published: 10 July 2020
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. View Full-Text
Keywords: forest walk; dityrosine; hexanoyl-lysine; protein oxidation; lipid peroxidation; phytoncides forest walk; dityrosine; hexanoyl-lysine; protein oxidation; lipid peroxidation; phytoncides
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MDPI and ACS Style

Yamada, A.; Sato, Y.; Horike, T.; Miyanaga, M.; Wang, D.-H. Effects of a Forest Walk on Urinary Dityrosine and Hexanoyl-Lysine in Young People: A Pilot Study. Int. J. Environ. Res. Public Health 2020, 17, 4990. https://doi.org/10.3390/ijerph17144990

AMA Style

Yamada A, Sato Y, Horike T, Miyanaga M, Wang D-H. Effects of a Forest Walk on Urinary Dityrosine and Hexanoyl-Lysine in Young People: A Pilot Study. International Journal of Environmental Research and Public Health. 2020; 17(14):4990. https://doi.org/10.3390/ijerph17144990

Chicago/Turabian Style

Yamada, Ai; Sato, Yoshiko; Horike, Tokushi; Miyanaga, Masamitsu; Wang, Da-Hong. 2020. "Effects of a Forest Walk on Urinary Dityrosine and Hexanoyl-Lysine in Young People: A Pilot Study" Int. J. Environ. Res. Public Health 17, no. 14: 4990. https://doi.org/10.3390/ijerph17144990

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