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KMID : 1101720160200030051
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Physical Activity and Nutrition
2016 Volume.20 No. 3 p.51 ~ p.55
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Association between daily step counts and physical activity level among Korean elementary schoolchildren
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Park Jong-Hoon
Kazuko Ishikawa Takata
Lee Sang-Jik
Kim Eun-Kyung
Lim Ki-Won
Kim Hyung-Ryul
Lee In-Sook
Tanaka Shigeho
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Abstract
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[Purpose] The purpose of the current study was to investigate steps per day (steps/d) and physical activity level (PAL) in Korean elementary school children having normal weight (normal-weight). We also clarified whether a gender difference exited between steps/d and PAL.
[Methods] Children aged 9 to 12 y were recruited from two elementary schools located in different urban districts in Korea. The present study included 33 Korean children, of which 18 were normal-weight boys and 15 were normal-weight girls. During the same 1 week study period under free-living conditions the total energy expenditure (TEE) and step counts were estimated using the doubly labeled water (DLW) method and an accelerometer, respectively. We calculated PAL as the TEE/ resting metabolic rate.
[Results] The range of PAL was 1.25 ? 1.93 with a mean value of 1.57. None of the variables of energy expenditure was significantly different by sex. However, steps/d were significantly higher in boys than in girls. When adjusting regression analysis by gender, steps/ d were positively associated with PAL among all subjects (r = 0.56, P < 0.01). Furthermore, steps/d were positively associated with PAL in boys (r = 0.68, P < 0.01), but not in girls (r = 0.27, P = 0.34).
[Conclusion] Our results suggest that locomotive activity may be the main contributor to the individual PAL differences for elementary school boys, while non-locomotive activity may be the main contributor for elementary school girls.
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KEYWORD
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Step counts, PAL, Children
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