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BACKGROUND Evidence for a link between long-term exposure to air pollution and lung cancer is limited to Western populations. In this prospective cohort study, we examined this association in a Japanese population. METHODS The study comprised 63 520 participants living in 6 areas in 3 Japanese prefectures who were enrolled between 1983 and 1985. Exposure… (More)
Prevalences of periodic limb movement-like and restless legs-like symptoms among Japanese adults were investigated. The latter symptom was significantly associated with insomnia.
OBJECTIVES To examine whether 50-Hz magnetic fields acutely influence cognitive performance function in humans. METHODS The exposure experiment was conducted in a wooden room with three-axis coils. Twenty young subjects were exposed to circularly polarized 50-Hz/20-mu T magnetic fields for 55 min, during which they were requested to perform four cognitive… (More)
BACKGROUND There is global concern over significant threats from a wide variety of environmental hazards to which children face. Large-scale and long-term birth cohort studies are needed for better environmental management based on sound science. The primary objective of the Japan Environment and Children's Study (JECS), a nation-wide birth cohort study… (More)
BACKGROUND The effects of airborne particulate matter (PM) are a major human health concern. In this panel study, we evaluated the acute effects of exposure to PM on peak expiratory flow (PEF) and wheezing in children. METHODS Daily PEF and wheezing were examined in 19 asthmatic children who were hospitalized in a suburban city in Japan for approximately… (More)
This study is a reexamination of the possibility that exposure to extremely low frequency alternating magnetic field (ELF-MF) may influence heart rate (HR) or its variability (HRV) in humans. In a wooden room (cube with 2.7-m sides) surrounded with wire, three series of experiments were performed on 50 healthy volunteers, who were exposed to MFs at… (More)
Electroencephalogram (EEG) power spectrum changes induced by pleasant music (2-min. fractions of 6 samples of music [famous classical and commercially available "alpha music" at 10-sec. intervals]) were investigated in relation to changes in 16 kinds of psychosomatic feelings. Subjects were 42 healthy young people aged 18-25 yrs. Two major components,… (More)
The prevalence of nocturia among Japanese community-dwelling adults was associated with insomnia, taking into account other correlates of insomnia.
BACKGROUND Little information is available on the possible association between hourly short-term air pollution and peak expiratory flow (PEF) in asthmatic children. METHODS PEF was measured twice daily, from October through December, 2000, in 17 children aged 8 to 15 years hospitalized with severe asthma. A total of 1198 PEF measurements were made at 7… (More)
BACKGROUND We examined the association between short-term exposure to outdoor air pollution and nighttime primary care visits due to asthma attack. We also investigated the modifying effects of age on this association. METHODS A case-crossover study was conducted at a primary care clinic in metropolitan Tokyo. The subjects were 308 children aged 0-14… (More)