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GT1M과 GT3X가속도계의 신체활동량 추정 타당도 평가

Validation of the GT1M and GT3X Accelerometers for Assessment of Physical Activity

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초록

본 연구의 목적은 일축가속도계인 GT1M과 삼축가속도계인 GT3X간의 신체활동량 추정에 관한 타당도 평가이다. 연구대상은 서울, 경기 지역에 거주하는 남자를 대상으로 아동은 28명, 성인은 17명으로 임의 표본 추출하였다. 신체활동량은 두 집단 모두 운동강도가 증가함에 따라 VO2, GT1M, 그리고 GT3X의 Activity Counts가 증가하는 것으로 나타났다. 또한, 두 집단에 대하여 동일한 운동강도에 변화량을 주었을 때 성인에 비해 아동의 VO2와 METs의 변화량이 큰 것으로 나타났으며, GT1M, GT3X의 Activity Counts에 대해서는 낮은 변화폭을 나타냈다. 가속도계와 준거 도구의 신체활동량에 대한 관계를 살펴본 결과, GT1M과 GT3X가속도계의 Activity Counts와 본 연구에 사용된 K4b2 모든 변인에 대하여 통계적으로 유의한 상관이 있는 것으로 나타났으며 아동보다 성인에게서 더 높은 상관이 있는 것으로 나타났다(p<.01). 설명력은 GT1M과 GT3X가속도계 모두 성인(R2=.798, R2=.801)에게서 아동(R2=.550, R2=.522)보다 높은 것으로 나타났다. Bland-Altman Plot에서는 GT3X가 GT1M 보다 편차가 작은 신뢰구간을 나타냈으며, 성인이 아동보다 편차가 작은 신뢰구간을 나타냈다. 대상별에 따른 좀 더 정확한 결과치를 제공 받을 수 있도록 올바른 가속도계의 선택이 요구된다.

Abstract

The purpose of this study is to evaluate the validation of physical activity between GT1M, the uniaxial accelerometer and GT3X, the triaxial accelerometer. For the subject of the study, 28 children and 17 adults were random sampling who are residing in Gyeonggi province. It is observed that as the exercise intensity increases, the physical activity of VO2, METs, GT1M and GT3X in both groups are increased. Also, when both two groups have given changes to equivalent exercise intensity, the children showed higher VO2 and METs changes than those of adults while the value of GT1M and GT3X showed lower changes. As a result of observing the relationship between accelerometer and standard tool, activity counts of GT1M and GT3X and all variables of K4b2 which were employed in this study showed statistically significant relation, while showed higher relation in adult than in children(p<.01). Both GT1M and GT3X showed higher explanatory power in adult (R2=.798, R2=.801) than in children (R2=.550, R2=.522). In Bland-Altman Plot, GT3X showed confidence interval with less deviation than GT1M, while the adult showed confidence interval with less deviation than the children. To provide a more accurate result value, the correct choice of accelerometer according to the sampling is required.

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