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A numerical approach to estimating forest recreational effects by the fractal analysis of heartrate variability

通过心率变异性分形分析估算森林游憩效果的数值方法

基本信息

批准号：
13660145
负责人：
YAMADA Yozo
金额：
$ 2.24万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13660145/
关键词：
forest recreation soundscape murmur of brook psychological response physiological response heartrate variability 1 f fluctuation relaxation effect フラクタル次元レクリェーション効果森林内の音周波数分析 f分の1ゆらぎ視覚情報 f分の1のゆらぎ

项目摘要

We investigated the actual recreational utilization and administration in the Akazawa recreational forest. As a result, the number of visitors has increased since the late 1980's, and it is cleared that the visitors amount to about 100 thousand per year. Moreover, the local government mainly administrates the forest. As they have problems such as decrepit facilities, aging stuffs and so on, it is important for them to maintain facilities efficiently and to train stuffs.We performed comparative experiments for peculiarities of vertical propagation of sounds in a deciduous broad-leaved secondary forest and a no echo chamber. It is cleared that the sound which length is shorter than three or four times of the leaf length is damped excessively, while the sound which length up to 10 times of the leaf length is observed the tendency of minus insertion loss. As results of frequency analysis, the murmur of broad-leaved tree is mainly composed of high frequency elements round 5 kHz and has the 1/f fluctuation. On the contrary, the murmur of coniferous tree is mainly composed of relatively low frequency elements round 1 kHz and is poor in high frequency elements.We studied psychological and physiological responses against sound-scopes of a fall, a small river, and a brook. Although the sound of fall has 1/f fluctuation, the other sounds are nearly l/f2 fluctuation. As for the psychological response, almost all of subjects hate the sound of fall while sound-scopes of brook and small river get very good impression. As for the physiological responses, the sound of fall is estimated most relaxed, and the other sounds and sound-scopes are not observed any remarkable tendencies. Thus it is clear that there may be little correlation between psychological and physiological responses.

对赤泽游憩林的实际游憩利用和管理进行了调查。因此，自20世纪80年代末以来，游客人数有所增加，很明显，每年的游客人数约为10万人。此外，当地政府主要管理森林。由于他们有诸如设备破旧，设备老化等问题，对他们来说，有效地维护设备和培训人员是很重要的。对落叶阔叶次生林和无回声室中声音垂直传播特性进行了对比实验。可以看出，长度小于叶片长度的3倍或4倍的声音阻尼过度，而长度大于叶片长度的10倍的声音则有负插入损失的趋势。频率分析结果表明，阔叶树杂音主要由5 kHz左右的高频元素组成，具有1/f的波动。相反，针叶树杂音主要由1 kHz左右的相对低频元素组成，高频元素较差。我们研究了对瀑布、小河和小溪的声音的心理和生理反应。虽然落下的声音有1/f波动，但其他声音几乎是1/ f2波动。在心理反应上，几乎所有的被试都讨厌秋天的声音，而小溪和小河的声域对秋天的声音印象很好。在生理反应方面，跌倒声被认为是最放松的，其他声音和声域没有观察到任何显著的趋势。因此，很明显，心理和生理反应之间可能没有什么相关性。