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Physiological Effects of Touching Coated Wood
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Int. J. Environ. Res. Public Health 2017, 14(7), 801; doi:10.3390/ijerph14070801

Physiological Effects of Touching Wood

1
Department of Wood Engineering, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan
2
Center for Environment, Health and Field Sciences, Chiba University, 6-2-1 Kashiwa-no-ha, Kashiwa, Chiba 277-0882, Japan
These authors have contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 19 May 2017 / Revised: 6 July 2017 / Accepted: 13 July 2017 / Published: 18 July 2017
(This article belongs to the Special Issue Evidence-Based Nature Therapy: Advances in Physiological Evaluation)
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Abstract

This study aimed to clarify the physiological effects of touching wood with the palm, in comparison with touching other materials on brain activity and autonomic nervous activity. Eighteen female university students (mean age, 21.7  ±  1.6 years) participated in the study. As an indicator of brain activity, oxyhemoglobin (oxy-Hb) concentrations were measured in the left/right prefrontal cortex using near-infrared time-resolved spectroscopy. Heart rate variability (HRV) was used as an indicator of autonomic nervous activity. The high-frequency (HF) component of HRV, which reflected parasympathetic nervous activity, and the low-frequency (LF)/HF ratio, which reflected sympathetic nervous activity, were measured. Plates of uncoated white oak, marble, tile, and stainless steel were used as tactile stimuli. After sitting at rest with their eyes closed, participants touched the materials for 90 s. As a result, tactile stimulation with white oak significantly (1) decreased the oxy-Hb concentration in the left/right prefrontal cortex relative to marble, tile, and stainless steel and (2) increased ln(HF)-reflected parasympathetic nervous activity relative to marble and stainless steel. In conclusion, our study revealed that touching wood with the palm calms prefrontal cortex activity and induces parasympathetic nervous activity more than other materials, thereby inducing physiological relaxation. View Full-Text
Keywords: wood; tactile; autonomic nervous activity; prefrontal cortex activity; heart rate variability; near-infrared spectroscopy; semantic differential method; profile of mood states; physiological relaxation; preventive medical effect wood; tactile; autonomic nervous activity; prefrontal cortex activity; heart rate variability; near-infrared spectroscopy; semantic differential method; profile of mood states; physiological relaxation; preventive medical effect
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Ikei, H.; Song, C.; Miyazaki, Y. Physiological Effects of Touching Wood. Int. J. Environ. Res. Public Health 2017, 14, 801.

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