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어린이 신체활동 강도 추정을 위한 가속도계 기준치의 정확도

Accuracy of Accelerometer Cut-Points for Estimating Physical Activity Intensity for Children

이미현
한국체육측정평가학회 (Korean Society For Measurement And Evaluation In Physical Education And Sports Science)|2014.08|한국체육측정평가학회지 (The Korean Journal of Measurement and Evaluation in Physical Education and Sports Science)|제16권 제2호|pp. 13-26|DOI 10.21797/ksme.2014.16.2.002

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참고문헌

키워드

accuracy정확도ROC curveROC 곡선uniaxial accelerometer일축가속도계기준치cut-points

초록

본 연구의 목적은 ActiGraph 일축가속도계 카운트(counts)로부터 개발된 다섯 가지(Freedson, 2005; Puyau, 2002; Treuth, 2004; Pate, 2006; Evenson, 2008) 기준치(cut-points)를 비교⋅분석하여 어린이용 신체활동 강도 기준치의 정확성을 검증하는 것이다. 이러한 목적을 달성하기 위하여 경기도 Y시에 소재하고 있는 초등학교에 재학 중인 어린이 78명(142.40±7.60㎝, 40.10±10.27㎏, 11.11±1.02세)을 편의추출 하였으며 다음과 같은 결론을 도출하게 되었다. 신체활동 강도가 증가함에 따라 산소섭취량, 심박수 그리고 일축가속도계의 카운트는 증가하였으며, 산소섭취량과 일축가속도계의 1분, 30초, 15초 자료요약주기는 유의한 상관을 나타냈다(p<.01). ROC 곡선을 이용하여 준거 활동 강도와 기준치로 변환된 활동 강도 간의 분류의 정확도를 비교한 결과 5가지 기준치 모두 매우정확(excellent)하게 구분하지는 못하였다. 그러나 Freedson, Puyau 그리고 Pate의 기준치는 중강도와 고강도 활동 중 한 가지 강도에서 분류의 정확도가 보통(fair)의 수준을 나타냈으며 중⋅고강도 활동에서 세 가지 추정식 모두 정확도가 정확(good)의 수준을 나타냈다. 이에 Freedson, Puyau 그리고 Pate의 기준치는 어린이가 하루 중 중⋅고강도 신체활동에 참여하는 시간과 빈도 또는 활동 패턴을 추정하고자 할 때 유용하게 사용될 수 있을 것으로 판단된다.

Abstract

The purpose of this study is to verify accuracy in the cut-points of intensity for children by comparatively analyzing five kinds of cut-points(Freedson, 2005; Puyau, 2002; Treuth, 2004; Pate, 2006; Evenson, 2008) that were developed from counts in uniaxial accelerometer of ActiGraph. To achieve this objective, it convenience sampled 78 children(142.40±7.60㎝, 40.10±10.27㎏, 11.11±1.02yr) who are attending elementary school where is located in Y city, Gyeonggi-do. The following conclusions came to be elicited. According to a rise in physical activity intensity, the oxygen uptake, heart rate, and uniaxial accelerometer counts grew. The epoch length in 1 minute, 30 seconds, and 15 seconds of oxygen uptake and uniaxial accelerometer showed significant correlation(p<.01). As a result of comparing accuracy of classification between the standard activity intensity and the activity intensity, which was changed into cut-points, by using ROC curve, all of the five cut-points failed to divide excellently. However, cut-points in Freedson, Puyau and Pate showed accuracy of classification in fair level in one intensity out of moderate intensity and vigorous intensity activities. In the moderate-vigorous intensity activities, all of the three estimated equations showed accuracy of classification in good level. Accordingly, cut-points in Freedson, Puyau and Pate are judged to be likely able to be employed usefully when aiming to estimate time, frequency or activity pattern that children participate in moderate-vigorous intensity physical activities throughout the day.

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