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Biomedical subjects

Dru Marshall

Publications and source records attributed to Dru Marshall.

2 recordsLinked to original sources

Obesity, adiposity, physical fitness and activity levels in Cree children.

OBJECTIVES: To describe the levels of obesity, adiposity measures, physical activity and fitness in Cree children aged 9-12 years. STUDY DESIGN: Cross-sectional survey. METHODS: The study took place in northern Quebec, Canada. Height, body mass, waist circumference and five skinfold thicknesses were measured. Physical activity was assessed by having children wear a pedometer for two days. Children performed the 20-metre shuttle run test (SRT) to determine their physical fitness level. RESULTS: Of 82 participating children, 33% were overweight (but not obese) and 38% were obese according to an international reference. The mean sum of five skinfold measures exceeded the 95th percentile of Canadian children. Compared with the Third National Health and Nutrition Examination Survey, the majority of children exceeded the 85th percentile for waist circumference (62%) and at the suprailiac (80%), subscapular (72%), and triceps (54%) skinfold sites. 90% of children scored below the 20th percentile in the SRT compared with normative data from Quebec children. Based on pedometer scores, only 49% of children were sufficiently active. CONCLUSIONS: There is a high prevalence of overweight and central adiposity in this population, with low physical activity and fitness levels. This profile may result in adverse health outcomes.

Adiposity↗

Validity of test score interpretations for three self-concept measures based on differing theoretical models.

Three theoretical models have been proposed to represent self-concept: (a) unidimensional; (b) multidimensional; (c) multidimensional hierarchical. Inventories have been developed under each of the three competing theoretical models; which model best represents self-concept is unclear. Typically, self-concept construct validation has utilized various approaches including correlational, multitrait-multimethod, and factor analytic methods. Another method, however, for assessing validity would be to determine the consequences of score interpretations using different measures specific to each of the theoretical models. This paper examined Messick's notion (1989) of the validity of test-score interpretations as applied to three of the most widely used measures derived under each of the three different theoretical models of self-concept. Results suggest that overall multidimensional measures are more consistent in classifying individual's self-concept than unidimensional measures.

Adolescent↗