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- W1829753042 abstract "This thesis includes one qualitative literature review, three empirical studiesand one meta-analysis examining the measurement of physical activity inchildren. Previous research has highlighted the difficulties inherent inmeasuring children's habitual activity. This has lead to confusion regardingthe relationships between physical activity and health in children. Recently anew type of activity monitor has been developed. Uniaxial (WAM,Computer Science Applications, Shalimar, Florida, USA) and triaxial(Tritrac, Professional Products, a division of Reining International,Madison, WI, USA) accelerometers that record temporal, frequency andintensity information of movement are now commercially available. Theaims of this thesis were to evaluate the validity of these and other measuresof physical activity in children, to examine the relationship between physicalactivity and body fat in children and to investigate the effect the mode ofactivity measurement has on this relationship.The main findings were: a) The Tritrac provided a significantly better estimate of scaled oxygen consumption during typical children'sactivities than the WAM, heart rate or pedometry; b) Physical activity,measured by the Tritrac or the pedometer, was inversely correlated withbody fat and positively correlated with aerobic fitness; c) Heart ratemeasures of physical activity did not correlate significantly with body fat oraerobic fitness; d) Meta-analytic procedures showed a small to moderaterelationship between activity levels and body fat in children; e) The strengthof this relationship was heavily dependent on the method used to assessactivity levels. Observation methods produced an effect size significantlyhigher than questionnaire or heart rate methods, though not significantlydifferent to motion counter methods. In conclusion it appears that heart ratemethods are inappropriate for the assessment of habitual activity in children.The use of motion counters or observation methods for assessing activity arerecommended. Motion counter methods are particularly appropriate formedium to large sample sizes." @default.
- W1829753042 created "2016-06-24" @default.
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- W1829753042 date "1998-01-01" @default.
- W1829753042 modified "2023-09-28" @default.
- W1829753042 title "The measurement of physical activity in children." @default.
- W1829753042 hasPublicationYear "1998" @default.
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