Analysis of Volatile Compounds and Their Seasonal Changes in Rooms Using Sugi (&lt;i&gt;Cryptomeria japonica&lt;/i&gt;) Wood Boards as Interior Materials

Shimizu, Kuniyoshi; Yoshimura, Yuri; Nakagawa, Toshinori; Matsumoto, Sayaka; Washioka, Yuki; Haga, Eriko; Honden, Akiyoshi; Nakashima, Taisuke; Saijo, Hiromi; Fujita, Kazuo; Watanabe, Yuichiro; Okamoto, Genichi; Inoue, Shinshi; Yasunari, Shinji; Ni, Jun; Yamada, Yuki; Okamoto, Tsuyoshi; Onuki, Koichiro; Ishikawa, Hiroya; Fujimoto, Noboru

doi:10.2488/jwrs.63.126

Cited by 3 publications

(4 citation statements)

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“…Our present findings revealed that the Japanese cedar and laminate rooms had the same types of volatile organic compounds. This was also observed in another study [13], and we suspect that the reason for this is that high-temperature dried Japanese cedar wood was used as the structural material of the laminate room. Our present investigation differs from a report that that airdried, conventionally dried, and high-temperature dried Japanese cedar wood chips emitted different VOCs [25].…”

Section: Discussionsupporting

confidence: 75%

“…All of the materials used in both rooms emitted an amount of formaldehyde conforming to F☆☆☆☆ (Japanese Industrial Standard, formaldehyde emission limit: 0.5 mg/L) [12]. It has been demonstrated that the main atmospheric VOCs of the two rooms were essentially the same [13]. Room A had a higher level of VOCs (mainly terpenes) compared to Room B.…”

Section: Experimental Roomsmentioning

confidence: 99%

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Effects and interaction of different interior material treatment and personal preference on psychological and physiological responses in living environment

et al. 2020

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Japanese cedar (Cryptomeria japonica) wood is widely used as a traditional construction material in Japan. The relationship between an individual’s perceived comfort level and a preference for Japanese cedar wood interiors is of interest. We compared volunteers’ physiological responses and subjective evaluations of wooden dwelling spaces with different wood materials: planed Japanese cedar lumber, or printed grain resin sheet overlay boards. Eighty-three subjects were asked to stay in each room for 30 min. We evaluated salivary stress markers, blood pressure, the profile of mood states-brief form (POMS), and a questionnaire that used the semantic differential method to evaluate the subjects’ feeling state for both rooms. The concentrations of the volatile organic compounds in both rooms were also quantified after the experiment. The results demonstrated that the subjects’ evaluation of each room was highly dependent on their preference; each room was evaluated more positively by subjects who preferred it. Although the subjects’ feelings were also influenced by their preference, the room with Japanese cedar did not elicit negative feelings, even from the subjects who disliked it. The subjects’ physiological responses were totally independent of their preferences. Their blood pressure decreased in the Japanese cedar room, and their salivary alpha-amylase activity was repressed in both rooms. These results indicated that the subjective evaluations were influenced in part by the subjects’ preferences, while their physiological responses were not affected. Regardless of which room the subjects preferred, the Japanese cedar room reduced the subjects’ blood pressure compared to the room with artificial materials.

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Section: Discussionsupporting

confidence: 75%

Section: Experimental Roomsmentioning

confidence: 99%

Effects and interaction of different interior material treatment and personal preference on psychological and physiological responses in living environment

et al. 2020

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“…The total volume of VOCs emitted from the Japanese cedar was 282.4 (μg/m 3 ) in the wood condition, and the constituents were mainly δ-cadinene and other sesquiterpenes. Previous studies reported the characteristics in indoor air and emission behavior of VOCs emitted from solid wood and wood composites [ 15 – 18 ]. The constituents and total volume of VOCs are important factors for creating a comfortable environment good for human health.…”

Section: Discussionmentioning

confidence: 99%

“…However, studies about optimal VOC conditions for the human body, particularly for the sesquiterpenes emitted from a wood interior, have not been reported. Moreover, chronic effects have been researched by several studies, in which seasonal variation in VOCs and the VOC composition of the different interior materials were investigated [ 17 , 18 ]. A strategy focused on the relationship between indoor air and human health should be adopted for future research.…”

Section: Discussionmentioning

confidence: 99%

Gender differences in the psychophysiological effects induced by VOCs emitted from Japanese cedar (Cryptomeria japonica)

Matsubara

Kawai

2018

Environ Health Prev Med

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BackgroundWood is a valuable material for interiors, and the psychophysiological relaxation effects of volatile organic compounds (VOCs) from wood chips and essential oils have been reported. However, few studies have identified the odors in full-scale wooden environment, and also, differences in gender have not been clarified. In this study, we aimed to confirm the effects of VOCs emitted from interior wood walls in both human male and female participants.MethodsWe used Japanese cedar timber and analyzed VOCs in the experimental rooms with and without Japanese cedar timber by gas chromatography-mass spectrometry (GC-MS). The physiological effects were measured using neuroendocrinological and immunological parameters in saliva. A questionnaire was used to evaluate the subjective responses to each odor in the experimental rooms.ResultsThe main compound emitted from Japanese cedar timber was δ-cadinene, and the total volume of VOCs in the wood condition (presence of VOCs emitted from Japanese cedar) was 282.4 (μg/m3). Significant differences between genders in salivary parameters were shown that there were decreases of α-amylase in wood condition and increases of cortisol in the control (absence of VOCs) condition in female participants compared to male participants. The results demonstrated that VOCs in the experimental room with Japanese cedar timber tend to suppress the activation of the sympathetic nervous activity and non-VOCs of Japanese cedar in the control room increase cortisol in female participants.ConclusionsThese results suggest that an indoor environment with wood interior materials has the potential to be useful for health management, especially women’s health.

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Electrophysiological effects of Japanese cedarwood on sleep quality in humans

Okamoto,

Nakashima,

Permana

et al. 2024

J Wood Sci

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Sleep plays an important role in human health. Changes in the sleeping environment can affect sleep quality. The present study investigated the effects of natural wood on sleep quality. The interior material was a fully used Cryptomeria japonica wood board (Japanese cedar room), while the particleboard and medium-density fiberboard (MDF) were covered by a vinyl cloth with a woodgrain (resin room). In order to assess sleep quality, the sleep–depth index (SDI) is calculated based on the lengths of sleep stage 3 and the rapid eye movement (REM) stage using electroencephalography (EEG). Before the sleep experiments, the Pittsburgh Sleep Quality Inventory (PSQI) and Morningness–Eveningness Questionnaire (MEQ) were administered to confirm the participants’ usual sleep habits. Thirteen participants were invited to sleep in two different environments. The MEQ before sleep experiments confirmed that eight participants were of the intermediate type and five participants were of the moderate evening type. According to the PSQI, three participants were poor sleepers and ten were good sleepers. The sleep EEG demonstrated that 12 of 13 participants had higher SDI in the Japanese cedarwood room than in the resin room. A Wilcoxon signed-rank test revealed that SDI was significantly prolonged in the Japanese cedarwood room than in the resin room, regardless of the small sample size (n = 13, z = 2.48, p = 0.014, effect size = 0.78). The present study demonstrated that the indoor environment with C. japonica induced a significantly higher SDI compared to that with wood-grain vinyl cloth. This indicates that the interior materials of C. Japonica wood can positively influence the sleep environment.

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Analysis of Volatile Compounds and Their Seasonal Changes in Rooms Using Sugi (<i>Cryptomeria japonica</i>) Wood Boards as Interior Materials

Cited by 3 publications

References 2 publications

Effects and interaction of different interior material treatment and personal preference on psychological and physiological responses in living environment

Effects and interaction of different interior material treatment and personal preference on psychological and physiological responses in living environment

Gender differences in the psychophysiological effects induced by VOCs emitted from Japanese cedar (Cryptomeria japonica)

Electrophysiological effects of Japanese cedarwood on sleep quality in humans

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