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A highly sensitive gas chromatographic system has been developed for continuous measurement of trace levels of ammonia concentrations in the atmosphere. The method is based on preconcentration using an collection tube packed with an adsorbent (alkalized Porasil B), thermal desorption, and analysis by a gas chromatograph equipped with a flame thermionic detector. The air sample was first preconcentrated by passing air through the collection tube at ambient temperature. The collected samples were thermally released for gas chromatographic analyses into the analytical column by use of a Curie-point thermal desorption device. Ammonia concentrations were quantitatively determined using this system. The detection limit for ammonia was approximately 30 pg, which allowed up to 20 pptv with a 2-L air sample, and the relative standard deviation was better than 5% in the range of 2-106 ppbv of ammonia. The results of the field tests demonstrated a unique combination of a short time resolution (15- or 30-min cycle) and a high sensitivity that allowed the monitoring of diurnal variations. The measurement procedure was automated for sampling and analysis.

Health information mavens are those who provide and share health information with others via interpersonal communication. We investigated the characteristics of health information mavens among Japanese elderly and whether those who share health information with others via interpersonal communication behave more healthily or report better health status compared to their peers. Data come from a cross-sectional analysis of 27,414 participants in the Japanese Gerontological Evaluation Study (JAGES) (mean age = 74 years). Mavenism is associated with being female, younger age, higher educational status, and perceived financial condition, as well as larger social networks, higher social support, and media exposure. A higher mavenism score was associated with healthier dietary, and exercise behaviors, but not associated with smoking or alcohol consumption. Mavens were more likely to have a disease and/or report disease symptoms. Health information mavens have the potential to facilitate word-of-mouth communication among older adults, who tend to be more disadvantaged in terms of health information access compared to younger populations. [ABSTRACT FROM AUTHOR]

Background: Evidence from a limited number of short-term trials indicates the difficulty in achieving population-level improvements in physical activity (PA) through community-wide interventions (CWIs). We sought to evaluate the effectiveness of a 5-year CWI for promoting PA in middle-aged and older adults using a cluster randomized design.Methods: We randomized 12 communities in Unnan, Japan, to either intervention (9) or control (3). Additionally, intervention communities were randomly allocated to three subgroups by different PA types promoted. Randomly sampled residents aged 40-79 years responded to the baseline survey (n = 4414; 74%) and were followed at 1, 3 and 5 years (78-83% response rate). The intervention was a 5-year CWI using social marketing to promote PA. The primary outcome was a change in recommended levels of PA.Results: Compared with control communities, adults achieving recommended levels of PA increased in intervention communities [adjusted change difference = 4.6 percentage points (95% confidence interval: 0.4, 8.8)]. The intervention was effective for promoting all types of recommended PAs, i.e. aerobic (walking, 6.4%), flexibility (6.1%) and muscle-strengthening activities (5.7%). However, a bundled approach, which attempted to promote all forms of PAs above simultaneously, was not effective (1.3-3.4%, P ≥ 0.138). Linear dose-response relationships between the CWI awareness and changes in PA were observed (P ≤ 0.02). Pain intensity decreased in shoulder (intervention and control) and lower back (intervention only) but there was little change difference in all musculoskeletal pain outcomes between the groups.Conclusions: The 5-year CWI using the focused social marketing strategy increased the population-level of PA. [ABSTRACT FROM AUTHOR]

Background: The purpose of this study was to examine the effectiveness and cost-efficiency of a tailored message intervention compared with a non-tailored message intervention for increasing colorectal cancer (CRC) screening rates among a non-adherent population, in a community-based client reminder program.Methods: After a baseline survey for psychological segmentation, 2140 eligible individuals were randomly assigned either to a group with a tailored matched-message condition (N = 356), a group with a non-tailored unmatched-message condition (N = 355), or to two control groups, one using a typical message with a professional design (N = 717) and one without a professional design (N = 712). The main outcome measure was attendance rates in a community-organized CRC screening program within five months of receiving a print reminder.Results: There was a significant difference in fecal occult blood test (FOBT) attendance rates at follow-up assessments between the tailored matched-message condition (14.0 %) and the control (9.9 %; OR = 1.48, p = 0.026), while there was no significant difference between the unmatched-message condition (11.0 %) and the control (OR = 1.12, p = 0.558), and between the matched-message condition and the unmatched-message condition (OR = 1.32, p = 0.219). The cost of a one-person increase in FOBT screening was 3,740 JPY for the tailored matched-message condition, while it was 2,747 JPY for the control.Conclusions: A tailored-message intervention for segmented individuals designed to increase CRC screening rates in a community-based client reminder program was significantly effective compared to a usual reminder, but not more effective than an unmatched message in a randomized controlled trial, and was not sufficiently effective to highlight its value from a cost perspective. Therefore, the tailored intervention including target segmentation needs to be improved for future implementation in a CRC screening program for a non-adherent population.Trial Registration: UMIN Clinical Trials Registry UMIN000004384 . Date of Registration: March 2011. [ABSTRACT FROM AUTHOR]

Background: Social participation is known to predict longevity. However, little is known about the effect of social participation according to an individual's position in civic groups. We evaluated the influence of social position on mortality, using data from a large cohort of Japanese older adults (the AGES cohort).Methods: Of 14,804 individuals aged 65 years and older enrolled in the AGES, 14,286 individuals were followed up for approximately 5 years from 2003 to 2008. We performed inverse probability of treatment weighted (IPTW) Cox proportional hazards regression with multiple imputation of missing values to compute hazard ratios (HR) for all-cause mortality according to the individual's position in the community organization(s) to which they belonged. We examined participation in the following civic groups: neighborhood association/senior citizen club/fire-fighting team, religious group, political organization or group, industrial or trade association, volunteer group, citizen or consumer group, hobby group, and sports group or club. The values for IPTW were computed based on demographic variables, socioeconomic status, and self-reported medical condition.Results: During 22,718 person-years of follow-up for regular members of community groups and 14,014 person-years of follow-up for participants in leadership positions, 479 deaths and 214 deaths were observed, respectively. Relative to regular members, crude HR for all-cause mortality for occupying leadership positions (e.g. president, manager, or having administrative roles) was 0.72 (95 % CI:0.62-0.85). The IPTW-HR was 0.88 (95 % CI: 0.79-0.99) for participants occupying leadership positions.Conclusions: Holding leadership positions in community organization(s) may be more beneficial to health than being regular members. [ABSTRACT FROM AUTHOR]