New Method of Time Series Analysis and Its Application   to Wolf's Sunspot Number Data

Ohtomo, Norio; Terachi, Saburou; Tanaka, Yukio; Tokiwano, Kazuo; Kaneko, Noboru

doi:10.1143/jjap.33.2821

Cited by 91 publications

(78 citation statements)

References 12 publications

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“…Heart rate variability (HRV) was analyzed for the periods between consecutive R waves in the electrocardiogram (R-R intervals) measured by a portable electrocardiograph (AC-301A, GMS Corporation). The power levels of the high-frequency (HF; 0.15-0.4 Hz) and low-frequency components (LF; 0.04-0.15 Hz) were calculated [20] every minute by the maximum-entropy method (Mem-Calc, GMS Ltd. [21]). The HF power is considered to reflect parasympathetic nervous activity [22].…”

Section: Physiological Measurementsmentioning

confidence: 99%

The physiological effects of Shinrin-yoku (taking in the forest atmosphere or forest bathing): evidence from field experiments in 24 forests across Japan

Park

Tsunetsugu

Kasetani

et al. 2009

Environ Health Prev Med

838

585

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This paper reviews previous research on the physiological effects of Shinrin-yoku (taking in the forest atmosphere or forest bathing), and presents new results from field experiments conducted in 24 forests across Japan. The term Shinrin-yoku was coined by the Japanese Ministry of Agriculture, Forestry, and Fisheries in 1982, and can be defined as making contact with and taking in the atmosphere of the forest. In order to clarify the physiological effects of Shinrin-yoku, we conducted field experiments in 24 forests across Japan. In each experiment, 12 subjects (280 total; ages 21.7 ± 1.5 year) walked in and viewed a forest or city area. On the first day, six subjects were sent to a forest area, and the others to a city area. On the second day, each group was sent to the other area as a cross-check. Salivary cortisol, blood pressure, pulse rate, and heart rate variability were used as indices. These indices were measured in the morning at the accommodation facility before breakfast and also both before and after the walking (for 16 ± 5 min) and viewing (for 14 ± 2 min). The R-R interval was also measured during the walking and viewing periods. The results show that forest environments promote lower concentrations of cortisol, lower pulse rate, lower blood pressure, greater parasympathetic nerve activity, and lower sympathetic nerve activity than do city environments. These results will contribute to the development of a research field dedicated to forest medicine, which may be used as a strategy for preventive medicine.

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Section: Physiological Measurementsmentioning

confidence: 99%

The physiological effects of Shinrin-yoku (taking in the forest atmosphere or forest bathing): evidence from field experiments in 24 forests across Japan

Park

Tsunetsugu

Kasetani

et al. 2009

Environ Health Prev Med

838

585

View full text Add to dashboard Cite

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“…through segment-based time-series analysis [22]. For example, this was done in our previous studies on measles using a 56-year data duration [33] and influenza using a 51-year duration [34].…”

Section: Mean Temp Relative Humidity Rainfallmentioning

confidence: 99%

Effect of temperature, relative humidity and rainfall on dengue fever and leptospirosis infections in Manila, the Philippines

Sumi

Telan²,

Chagan-Yasutan

et al. 2016

Epidemiol. Infect.

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SUMMARYDengue fever (DF) and leptospirosis are serious public problems in tropical regions, especially in Manila, the Philippines. In attempting to understand the causes of DF and leptospirosis seasonality, meteorological factors have been suspected, but quantitative correlation between seasonality and meteorological factors has not been fully investigated. In this study, we investigated correlation of temporal patterns of reported numbers of laboratory-confirmed cases of both DF and leptospirosis with meteorological conditions (temperature, relative humidity, rainfall) in Manila. We used time-series analysis combined with spectral analysis and the least squares method. A 1-year cycle explained underlying variations of DF, leptospirosis and meteorological data. There was a peak of the 1-year cycle in temperature during May, followed by maxima in rainfall, relative humidity and number of laboratory-confirmed DF and leptospirosis cases. This result suggests that DF and leptospirosis epidemics are correlated not only with rainfall but also relative humidity and temperature in the Philippines. Quantifying the correlation of DF and leptospirosis infections with meteorological conditions may prove useful in predicting DF and leptospirosis epidemics, and health services should plan accordingly.

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“…In experiments carried out by the authors, an ambulatory electrocardiogram monitor (AC301A; GMS Corp.) was attached to the subjects to store the data of the R-R interval for assessing HRV before, during, and after the subjects walked around or viewed the scenery in a forest area. The R-R interval data were subsequently analyzed using the maximum entropy method [9] (Memcalc; GMS Corp.). The power of the low-frequency (LF; 0.04-0.15 Hz) and high-frequency (HF; 0.15-0.4 Hz) components of the obtained heart rate power spectrum for each minute are generally calculated.…”

Section: Measurement Of Autonomic Nervous Activitymentioning

confidence: 99%

Trends in research related to “Shinrin-yoku” (taking in the forest atmosphere or forest bathing) in Japan

Tsunetsugu

Park

Miyazaki

2009

Environ Health Prev Med

317

203

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''Shinrin-yoku'', which can be defined as ''taking in the forest atmosphere or forest bathing'', has been receiving increasing attention in Japan in recent years for its capacity to provide relaxation and reduce stress. Since 2004, the authors of this paper have been involved in an investigation designed to ascertain the physiological effects of ''Shinrin-yoku'' within the framework of the ''Therapeutic Effects of Forests'' project. We have conducted physiological experiments, both in actual forests and in the laboratory, to elucidate the physiological effects on individuals of exposure to the total environment of forests or to only certain elements of this environment, such as the odor of wood, the sound of running stream water, and the scenery of the forest. We have obtained physiological measurements of central nervous activity, autonomic nervous activity, and biomarkers reflecting stress response that can be applied in this line of approach. Using these measurements, we have summarized the separate elements of forests in terms of the five senses. We have also reviewed a selection of field studies and introduced a number of results from ongoing projects as well as those from early studies. Future perspectives are also discussed.

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New Method of Time Series Analysis and Its Application to Wolf's Sunspot Number Data

Cited by 91 publications

References 12 publications

The physiological effects of Shinrin-yoku (taking in the forest atmosphere or forest bathing): evidence from field experiments in 24 forests across Japan

The physiological effects of Shinrin-yoku (taking in the forest atmosphere or forest bathing): evidence from field experiments in 24 forests across Japan

Effect of temperature, relative humidity and rainfall on dengue fever and leptospirosis infections in Manila, the Philippines

Trends in research related to “Shinrin-yoku” (taking in the forest atmosphere or forest bathing) in Japan

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