Fitness profiles and activity patterns of entering college students.

Fitness levels of American youth have shown a marked decline in the last decade, according to recent studies. To determine whether such a tendency persists for entering college students, the authors evaluated 115 male and 143 female students for performance on the following fitness-related variables: (1) maximal oxygen consumption (estimated from Astrand cycling protocol), (2) body composition (skin-fold techniques), (3) muscle endurance (sit-up protocol), (4) muscle strength (bench-press protocol), and (5) joint flexibility (upper and lower body protocols). Although neither men nor women exhibited high levels of cardiorespiratory fitness, the women in the study showed higher relative levels than their male counterparts. Both groups showed excellent levels of muscle strength (compared with normative standards), but they achieved only an average standard for muscle endurance. Findings of relatively low levels of cardiovascular fitness compared with levels of muscle strength, particularly in men, seem to be a reflection of an inappropriate concentration of physical activity.     

The effect of migration on ages at vital events: A critique of family reconstitution in historical demography

Demographic rates of historical populations have usually been calculated using only data from stayers alone. Can they be extrapolated to the population as a whole? Ruggles has recently pointed out, using both logic and a computer simulation, that stayers experience vital events earlier in life than movers due to migration censorship: those who experience them later in life have often migrated away from the community being studied. We show that stayers do indeed marry and die at younger ages than do movers, using a genealogical database on the American North (1620–1880). These differences are caused, however, both by migration censorship and by genuine differences between the two groups and the places they lived. Therefore changes over time among stayers are not good indicators of changes in the population as a whole because they are affected by changing migration rates. Thus no simple “correction factor” can be extrapolated to estimate the general population; neither stayers (nor movers) constitute a “baseline” or “normal” process: both must be considered together in order to gain an accurate picture of the population as a whole.     

DEXPERT: an expert system for the design of experiments

DEXPERT is an expert system, built using KEE, for the design and analysis of experiments. From a mathematical model, expected mean squares are computed, tests are determined, and the power of the tests computed. Comparisons between designs are aided by suggestions and verbal interpretations provided by DEXPERT. DEXPERT provides a layout sheet for the collection of the data and then analyzes and interprets the results using analytical and graphical methods.     

Managing Childcare: The Experiences of Mothers and Childcare Workers

This paper discusses the findings from an ethnographic study of childcare. It examines employed mothers and their experiences with sending their young children to childcare centers, and childcare workers and their perspectives on their work. In this 2‐year‐long research project, I studied two large, urban childcare centers, one independent, non‐profit and one part of a national, for‐profit chain. Methods included participant observation, in‐depth interviewing, and focus groups. I found that mothers’ experiences with childcare are shaped by three factors: (1) cultural messages; (2) feelings of anxiety and guilt; and (3) the perceived quality of the childcare. I explore these three factors and discuss how the mothers are affected by the “intensive mothering” ideology. For the childcare workers, their work is affected by: (1) the level of respect and economic rewards they receive, (2) their commitment to the children, and (3) their role as expert or authority and other issues of power. By examining the two groups of women together, it becomes clear that both groups of women face interwoven challenges in a culture that devalues children and childrearing, and that alliances to address these interwoven concerns are essential.