A preliminary evaluation of the associations among functional performance tasks and quality of life in obese and healthy weight youth

The associations among lower extremity functional performance and quality of life in obese youth are unknown. The aims of this study were to compare lower extremity strength, lower extremity functional performance, and health related quality of life between obese and healthy-weight youth and evaluate the relationships between lower extremity performance and health related quality of life in obese youth. Twenty obese and 20 age and sex matched healthy-weight youth were recruited. Peak torque of the major lower extremity muscles were measured. Functional performance was measured with single leg hop and single leg balance tests. The Paediatric Quality of Life questionnaire's physical and psychosocial health subscales were used. Paired t-tests and multiple regression analyses were performed. Obese youth demonstrated decreased peak torque in all muscles measured (P < 0.05), poorer functional performance (P < 0.05), and worse physical health related quality of life (P < 0.05) compared to healthy-weight youth. Lower extremity functional performance was associated with aspects of quality of life in the obese group (P = 0.002), but not in the healthy-weight group (P < 0.05). These results may assist in encouraging best practices in the promotion of exercise, physical activity, and quality of life in obese youth.     

The role of children's journals in elementary school science activities

Abstract: This article reports on a study that investigated the ways that children's use of science journals aided their acquisition of science understandings in one kindergarten and one fourth‐grade classroom. The questions for investigation were: how does the child contextualize the science experience on the journal page? How do child‐produced graphics on the journal page reflect the children's experiences with other school texts? The study found that children recontextualized their understandings of the science investigation and phenomena by using three types of mental contexts that were reflected in their science journals: these contexts were imaginary, experienced, and investigative worlds. By drawing on these three worlds or internal contexts, the children were able to pull the external phenomenon into an internal context that was familiar to them. The child's construction of ideas about a current science experience as expressed on the journal page may reflect experiences with other conventional texts. In this study the children's representations of their imaginary, experienced and/or investigative worlds were shaped by other texts and structures such as school science texts. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 38: 43–69, 2001     

The precision of data obtained in large-scale science assessments: An investigation of bootstrapping and half-sample replication methods

Powerful computational procedures are now available to better determine the accuracy of statistical estimates derived from data that have unknown distributions or do not meet parametric requirements. These techniques are generally called resampling plans and include the recently developed bootstrap. Science educators often face the problem of nonnormal distributions especially when conducting large-scale assessments or evaluating national curriculum projects that require complex sampling plans. Resampling techniques permit the researcher to make inferences without the strong distributional assumptions needed for more traditional parametric approaches. In this study, the bootstrap and a simplified version of a half-sample replication are used to examine the precision of science test scores obtained in a large-scale evaluation of Scope, Sequence, and Coordination, a national science curriculum project. The resampling plans are described in some detail and the results are compared with those obtained from parametric methods. © 1998 John Wiley & Sons, Inc. J Res Sci Teach 35: 697–704, 1998.     

Age–price profiles for Canadian painters at auction

We conduct an empirical analysis of the effect on the auction price of a Canadian painting of the age of the painter at the time of creation of the painting. We consider over two hundred artists, active over the entire history of Canadian art, who are pooled in the estimation of a hedonic regression in which a polynomial function in age enters as a regressor along with several other control variables. We consider the possibility that the age–price relationship has changed over time by: (a) estimating separate age–price functions for three generational groups of artists—those born before 1880, between 1880 and 1920, and after 1920 and thus coming of age in the world of post-war ‘contemporary art’ and (b) estimating a parameterization where the shape of the age–price profile is permitted to change continuously depending on the year of birth of the artist. Our principal result is that artists born more recently tend to ‘peak’ earlier in their careers than those of previous generations.     

Theory-based evaluation and the social impact of the arts

The well-documented challenges in researching the social impacts of the arts are closely related to key issues in contemporary social research and evaluation, most particularly the problem of causal attribution. The article contends that some of the most common criticisms of the evidence base for the social impact of the arts relate to the successionist model of change which underpins positivist social science research and evaluation. Illustrating this with reference to research on the arts and quality of life, the article considers the alternative generative understanding of causation that underpins theory-based evaluation (TBE) approaches, favoured recently in the UK as part of the “What Works?” agenda. While these approaches fit well with knowledge about the determinants of arts impact, the article considers whether in fact TBE approaches offer an effective strategy for understanding how and why arts engagement can result in social change. The limitations and possibilities of TBE are considered with reference to four recent UK studies of the impact of the arts on individuals which make use of them.     

A prospective study of pedometer-determined physical activity and physical self-perceptions in children

There have been limited prospective studies investigating physical activity and physical self-perceptions in children. In this investigation, mean steps/day did not significantly change from late elementary to junior high for either boys or girls; however; boys accumulated more steps both at baseline and follow-up. Physical self-perception measures were significantly related to changes in steps/day and accounted for 21% (15% adjusted) of the variance after controlling for demographic/biological variables, R2 change = .21, adjusted R2 change = .15, F (5,88) = 4.66, p < .001. Sport competence emerged as the most important predictor t (88) = -3.76, p < .001, and was inversely related to physical activity change. The lack of opportunities to participate in sport activities normally found at the onset of adolescence may help explain this unexpected result.     

Determinants of historic and cultural landmark designation: why we preserve what we preserve

There is much interest among cultural economists in assessing the effects of heritage preservation policies. There has been less interest in modeling the policy choices made in historic and cultural landmark preservation. This article builds an economic model of a landmark designation that highlights the tensions between the interests of owners of cultural amenities and the interests of the neighboring community. We perform empirical tests by estimating a discrete choice model for landmark preservation using data from Chicago, combining the Chicago Historical Resources Survey of over 17,000 historic structures with property sales, Census, and other geographic data. The data allow us to explain why some properties were designated landmarks (or landmark districts) and others were not. The results identify the influence of property characteristics, local socio-economic factors, and measures of historic and cultural quality. The results emphasize the political economy of implementing preservation policies.