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KMID : 0613820090190101368
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Journal of Life Science
2009 Volume.19 No. 10 p.1368 ~ p.1373
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Accuracy of Electronic Pedometers to Assess Body Fatness in Obese Children and Youth
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Kim Do-Yeon
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Abstract
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The purpose of this study was to assess the influence of waist size on the reliability and validity of pedometers to count steps in children and youth. The participants for this study were 20 children and youth, composed of 14 Hispanic and 6 Caucasian children. Ten children and youth had waist circumferences greater than the 85th percentile (Body Mass Index (BMI)=28.91±3.07), and 10 children and youth had waist circumferences smaller than the 50th percentile (BMI=18.05±1.55). To examine pedometer reliability, each child completed 3 ascent and descent trials up a set of 15 stairs while wearing a Yamax SW-701 pedometer. The main effect of trials was not statistically significant for the stair ascent trials F (2, 36)=2.575 or for the descent trials F (2, 36)=0.235. The trial by group interaction was also not statistically significant. To examine the influence of waist circumference on the validity of the pedometer in counting walking steps at a self-selected walking pace, the children and youth in the two groups completed a 400-m course. The main effect on the groups was statistically significant, F (1, 18)=7.489. The main effect of counting techniques was not statistically significant, F (1, 18)=2.983 (hand-counted vs. pedometer counted). Overall, the trial and trial by group interaction comparisons for the 400-m walk were not statistically significant, suggesting that the pedometer was equally valid as a tool for assessing walking steps in high waist circumference (HWC) and low waist circumference (LWC) in children and youth.
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KEYWORD
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Body fat, step counter, physical activity, pedometer, accuracy
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