Daily Inhalation Rate and Time‐Activity/Location Pattern in Japanese Preschool Children

Lack of data on daily inhalation rate and activity of children has been an issue in health risk assessment of air pollutants. This study aimed to obtain the daily inhalation rate and intensity and frequency of physical activity in relation to the environment in Japanese preschool children. Children aged four–six years (n= 138) in the suburbs of Tokyo participated in this study, which involved three days' continuous monitoring of physical activity using a tri‐axial accelerometer and parent's completion of a time/location diary during daily life. The estimated three‐day mean daily inhalation rate (body temperature, pressure, saturated with water vapor) was 9.9 ± 1.6 m³/day (0.52 ± 0.09 m³/kg/day). The current daily inhalation rate value of 0.580 m³/kg/day proposed for use in health risk assessment in Japan is confirmed to be valid to calculate central value of inhaled dose of air pollutants in five‐ to six‐year‐old children. However, the 95th percentile daily inhalation rate of 0.83 m³/kg/day based on measurement for five‐year‐old children is recommended to be used to provide an upper bound estimate of exposure that ensure the protection of all five‐ to six‐year‐old children from the health risk of air pollutants. Children spent the majority of their time in sedentary and light level of physical activity (LPA) when indoors, while 85% of their time when outdoors was spent in LPA and moderate‐to‐vigorous physical activity. The results suggest the need to consider variability of minute respiratory ventilation rate according to the environment for more refined short‐term health risk assessment.     

Influence of a home-based exercise program on the urine pH in elderly female subjects: a secondary analysis of a randomized controlled trial

Background

A low urine pH is a characteristic metabolic feature of metabolic syndrome and type 2 diabetes. The purpose of the current study was to investigate the effects of a 12-week home-based bench step exercise on the urine pH status of elderly female subjects.

Methods

The current study is a secondary analysis of a randomized controlled trial (RCT) in which 59 postmenopausal female subjects were randomized to either the exercise group (n?=?29) or the control group (n?=?30). The subjects in the exercise group were instructed to perform home-based exercises using a bench step at the anaerobic threshold (AT), with a goal of performing ≥140 min/week at home for 12 weeks. The subjects in the control group were instructed to not change their normal lifestyle. Urine was collected after overnight fasting, and the urine pH was measured using a urinary test strip. The inter-group-differences at baseline and the pre-post changes within groups were assessed using the Mann-Whitney U test and Wilcoxon’s signed-rank test, respectively. Additionally, the difference in the post-intervention urine pH levels of the two groups, adjusted for the pre-intervention values (the estimated effect size) and the precision (95% confidence intervals) were investigated using an analysis of covariance.

Results

The pre-post comparison of the urine pH data using Wilcoxon’s signed-rank test showed a significant increase in the urine pH levels of the exercise group (p?<?0.05); there was no significant change in the urine pH levels of the control group. However, the estimated effect size (0.15) was small and the confidence interval straddled 0 (?0.25–0.55).

Conclusions

Based on the results of the current secondary analysis of an RCT, we could not clearly conclude that exercise has a beneficial effect on the urine pH. Further well-designed RCTs should be conducted to determine whether aerobic exercise is truly able to ameliorate urine acidification.

Trial registration

The study was retrospectively registered in the University Hospital Medical Information Network (UMIN) as “Effect of step exercise on aerobic fitness and progression of atherosclerosis in the elderly” under the registration number UMIN 000026743 (the date of registration: March 28, 2017).

     

Increasing Childlessness in Germany and Japan: Toward a Childless Society?

Abstract: This paper focuses on childlessness in Germany and Japan and its sociological meanings in family formation in postmodern societies. First, it shows the trends of fertility decline and increasing childlessness, and clarifies the similarities and differences in both countries, by comparing parity composition, educational attainment, and other socioeconomic correlates of childlessness. Second, using the data of attitudinal surveys, such as the 2003 Population Policy Acceptance Study (PPAS) in Germany and the 13th National Fertility Survey (JNFS; 2005) in Japan, the reasons for having no children are observed. Third, referring to the discussions of German scholars, it tries to explain the sociological meanings of childlessness and to describe the development toward a childless society (even if it's demographically not sustainable) as one of the possible consequences of the Second Demographic Transition. Important findings are as follows: (1) In Germany the fertility decline began early in the mid-1960s but in Japan later from mid-1970s so that the increase of childlessness has been a little delayed. The proportion of childless women in Western Germany increased to 28% for the 1967 cohort. In Japan, it has increased to 12.7% for the 1960 cohort, but is expected to reach 30% for the 1970 cohort. (2) The educational gap in childlessness is clearly observed in Germany; however, this is not so simple in Japan. Corresponding with the increase of childlessness, the desired number of children in average is declining. The emergence of a child-free culture is observed in Germany by PPAS, but not yet in Japan by JNFS. (3) Polarization may proceed further in both countries, between childless people and people with many children.     

Conceptualizing maternal and paternal autonomy support and control among adolescents in Hong Kong

This study examined how parental autonomy support and control are conceptualized by adolescents in Hong Kong (Grades 7–11) using the Perceived Parental Autonomy Support Scale. Competitive models were evaluated using confirmatory factor analyses. Although the 6-factor model demonstrated the best fit, further analyses indicated that a second-order structure was more appropriate. Provision of choice, acknowledgment of child's feelings, rationale for rules, and demands subsumed under autonomy support. Guilt-inducing criticisms and the use of threats subsumed under control. Performance pressure emerged as a first-order construct on its own. Measurement invariance was evident across adolescent gender and age. All subscales had adequate to strong reliability. Discriminate validity was evident. Findings offer insights into the conceptualization of autonomy support and control in Hong Kong.     

Changes in the Labor Market and Occupational Prestige Scores

Abstract  In spite of the great changes in the structures of industry as well as work and occupation in postwar Japan as a result of rapid industrialization, occupational prestige scores as an index of people's evaluation of occupations did not reveal the corresponding changes. They maintained consistent stability since the mid 1950s aside from parallel upward movements, which might be a result of the permeation of an egalitarian ideology. Three kinds of occupational prestige scores calculated from data in the SSM survey of 1955, 1975 and 1995 had very high correlation with each other. The scores also showed a strong correlation between levels of education and income for each occupation, and no relation with labor market situation. And the unchanged order of occupations in Japan might be one of the reasons for the stability. The fact that people's evaluation of occupations revealed by prestige scores has scarcely changed and such scores has been associated with differences in the level of education makes us suspect that Japan's "credentialism" might be weakened in the near future.     

Estimate of the Number of International Children in Japan, Based on Trends in Intermarriage

Abstract  This paper focuses on international children (that is, children whose parents have different nationalities) in Japanese society. Using statistics on intermarriage in Japan between 1965 and 1990, we project the numbers of such children from 1991 to 2000. The important findings are summarized below:
1. There were estimated 165,000 international children under the age of 21 in Japan as of 1991. The number will increase to 528,000 by the end of the century if the intermarriage rate continues to increase as it has recently, but this will still represent less than 2% of the Japanese population under 21.
2. By the year 2000 roughly 75% of these will be children of foreign mothers, due to the rapid increase in marriages between Japanese grooms and foreign brides.
3. The number of children with dual nationality continues to remain much lower in Japan than advanced countries in Europe, despite concern expressed when the Nationality Law was revised in 1985. The number of children born to international couples in Japan is surprisingly small with respect to the number of international marriages, so a dramatic increase is not likely.     

Shoot growth dynamics and size-dependent shoot fate of a clonal plant,Festuca rubra, in a mountain grassland

The relation of the within-season and between-season patterns of shoot growth were compared in a clonal grass with long-lived shoots,Festuca rubra, in a mown mountain grassland. The growth rate of shoot length from spring to summer in a year was almost constant for each shoot irrespective of spring shoot length each year. The annual shoot growth rate from spring to spring was negatively correlated with the shoot length in the first spring. Shoots of different length and age therefore tended to converge over time to a population of identical shoot size, suggesting an equalizing effect of growth pattern on size structure. Shoot size (shoot length and number of leaves) influenced the fates of shoots. Larger shoots showed an increased incidence of both flowering and formation of intravaginal daughter shoots and a decreased incidence of death in the subsequent time period. The fates of shoots were independent of their age. Although the negatively size-dependent springto-spring annual shoot growth rate acted to decrease shoot size variation, the remaining variation within the shoot population was still sufficient to generate different fates of shoots. These fates were not related to the previous life history of individual shoots. There was a significantly positive effect of the shoot size at initiation on its life expectancy. This was mainly attributable to the positively size-dependent survival rate of shoots in the early stage (<1 year old) of shoot life history. Later on (> 1 year old), shoot size had little effect on the survival rate of shoots. Once small young shoots have survived this early stage (< 1 year old) in life history, they can grow vigorously, little affected by competition regardless of shoot size, and converge to a stable size structure of shoots of similar size. Only shoot size in the early stage ( < 1 year old) of life history is important for the persistence of a shoot population.     

Mortality risks,sequential decisions on births,and population growth

The population growth rates implied by parental attempts to be highly certain of having a surviving son for old-age support are investigated. At life expectancies of 40 to 65 years, family-planning “strategies” using contraception are found to imply markedly lower growth rates (1.01.5 percent vs. 2.5 percent) than are both commonly observed and also previously derived by Heer and Smith. In contrast to strategies relying only on sterilization, contraceptive spacing of births permits parents to buy time and information. In particular, they can postpone deciding whether to have another child until they see if their infant son will survive the earliest years of childhood. These results suggest that many less developed countries might achieve a substantial reduction in birth rates, provided that family-planning programs emphasized contraception as well as sterilization and effectively communicated the idea of spacing births. Factors bearing on the range of applicability of the old-age-security hypothesis, and any results and policies derived from it, are also briefly analyzed.     

Repeated sampling of spatial point distributions

A simple modification of a T-square sampling procedure for studying unmapped spatial distributions allows for the collection of several distance measurements at each randomly selected sampling location. A test of the null hypothesis of a completely random distribution of point items using these data is found to have power comparable to a related test based on T-square sampling if the number of items of data is held fixed, and to have greater power if the number of sampling locations is held fixed.     

Managing the Dyad Between Independence and Dependence: Case Studies of the American Elderly and Their Lives With Pets

Abstract:  In this article, I research the dyad between independence and dependence in pet companionship for the American elderly, and how elderly pet owners treat pets as a tool to enable them to balance the adherent norms between independence and dependence in order to navigate a successful later life. First, I explore individual life with pets: independent lifestyle with pets, emotional dependence on pets, management of pet loss, and limitation in pet responsibilities. Second, I discuss family and social life with pets: relationships with children, grandchildren and pets; husband–wife interactions and pets; and neighbors and pets. I examine these subjects through in-depth interviews with five middle-class Caucasian and Asian elderly pet owners who live in Los Angeles and San Diego, California, conducted in July 2005. Pets greatly help the elderly pet owners to maintain a balance between independence and dependence. Both an independent lifestyle and emotional dependence on their pets are formed through pet responsibilities. Some of the informants treated their pets as if they were their children. The others appeared emotionally dependent on memories of former pets, which provided the elderly pet owners with a sense of security and calm. The informants managed pet loss effectively by treating their pet as a tool upon which they conferred replaceable meanings or roles depending on their situation. The elderly pet owners also used their pets to facilitate family and social interactions. Having a pet is one important way that American elderly people can achieve subjective manipulation of later life.