Analysis of optimal activities according to thermal comfort in the forest: focusing on a program for the elderly at the National Forest Therapy Center

Tae-Gyu Khil1, Ah-Young Jung1, Kun-Woo Park2, Yang-Soon Oh2, Beom Lee3, Dawou Joung4, Hyelim Lee5, Bum-Jin Park5,*

1Department of Forest Therapy, Graduate School of Chungbuk National University, Cheongju 28644, Korea
2College of Medicine, Korea University, Seoul 02841, Korea
3Forest Welfare Research Center, Korea Forest Welfare Institute, Yeongju 36043, Korea
4Institute of Agricultural Science, Chungnam National University, Daejeon 34134, Korea
5Department of Environment and Forest Resources, Chungnam National University, Daejeon 34134, Korea

*Corresponding author:


The purpose of this study was to scientifically activate the forest healing program activities for the elderly. The predicted mean vote (PMV) and predicted percentage of dissatisfied (PPD), which are indices of thermal comfort in the thermal environment, and degree of canopy closure were compared and analyzed. Based on this information, the study objective was to present the appropriate conditions for maintaining the best comfort for the elderly. Six deck road shelters, which are the most active locations in forest healing programs among the National Center for Forest Therapy, were selected as the study sites. The results indicated that in the case of the conditions of 1 clo (clothing insulation value) and 1 met (metabolic rate) at an air temperature of 19 to 21 degrees in September on the measurement date, the PMV values ranged between -1.85 and -0.98 at all sites, and PPD values ranged between 25.60% and 68.68%. On the other hand, in the case of 1.3 clo and 1.6 met conditions, the PMV values ranged between -0.08 and 0.23 for all sites and PPD values ranged between 5.40 and 6.18. As shown above, the difference in thermal environment comfort and satisfaction according to the condition of the amount of metabolism and the amount of clothing could be confirmed. In addition, an analysis of the relation between PPD and canopy closure suggested a significantly positive correlation between them, and it was found that canopy closure was a factor affecting thermal comfort. Studies on effects of forest thermal environmental comfort and canopy closure on forest healing program areas should be conducted extensively according to seasonal conditions to provide information that can be used for more effective forest healing programs.


canopy closure, forest healing program, PMV (predicted mean vote), PPD (predicted percentage of dissatisfied)

More details can be read in the PDF