Effect of forest walking on autonomic nervous system activity in middle-aged hypertensive individuals: a pilot study

Song C, Ikei H, Kobayashi M, Miura T, Taue M, Kagawa T, Li Q, Kumeda S, Imai M, Miyazaki Y
Int J Environ Res Public Health. 2015 Mar 2;12(3):2687-99

https://www.ncbi.nlm.nih.gov/pubmed/25739004