객관적 신체활동 검사도구의 타당도와 신뢰도검증: Actigraph GT3X와 Omron HJ720IT

국문 초록 (Abstract)

이 연구는 신체활동 현장검사도구인 가속도계 (Actigraph GT3X) 와 보행계수계 (Omron HJ720IT) 의 준거와 수렴타당도를 검증하고 검사도구의 동질성 (Equivalence) 을 검증하는데 목적이 있다. 구체적으로 가속도계와 보수계는 1)신체활동 측정의 준거검사인 간접열량계 (K4b²)를 이용하여 준거타당도를 검증, 2) 다른 객관적 현장 검사 (참고검사)도구와 수렴타당도를 검증, 2) 가속도계의 신체활동강도 기준치 (Cut-off point) 의 정확성을 검증, 4) 검사점수의 일관성을 검증하는데 목적이 있다. 신체조성이 정상범위인 성인 남녀 52명을 편의표집하여 선정된 11개의 일상생활 활동을 통해 산소섭취량, 에너지소비량, MET점수, 심박수, 보행수를 측정하였다. 얻어진 검사점수는 피어슨 상관계수, 유목내상관계수, 오차율을 계산하여 타당도와 신뢰도를 검증하였다. 이 얻어진 결과는 가속도계의 경우 1) 준거검사와 참고검사를 근거로 할 때 신체활동량은 각 신체활동 강도에 맞게 점차적으로 증가하고 2) 기존에 개발된 가속도계의 기본 신체활동 강도는 실제 검증된 신체활동 강도와는 유사하지 않았다. 따라서 새로운 신체활동 강도 기준치가 개발되어야 할것이다. 보행계수계의 경우 1) 준거/참고검사와 낮은 상관을 보인 반면, 2) 검사자에 의해 측정된 보행수가 준거검사일 경우 보다 정확하게 측정하였다. 마지막으로 가속도계와 보행계수계 모두 검사도구간 검사점수의 일관성을 보였다.

다국어 초록 (Multilingual Abstract)

The purposes of this study was to validate an accelerometer (Actigraph GT3X) and a pedometer (Omron HJ720IT) and to examine the accuracy of the instrument to measure physical activity levels for Korean adults. The total of 52 participants (23 males and 19 females) with the normal range of body mass index was performed the eleven representative physical activities on the treadmill and in free livings. As a criterion measure, the indirect calorymetry (K4b²) and the direct measures of steps taken were employed as well as the heart rate monitor as a reference measure. Pearson product moment correlation, intra-class correlation coefficient, percent of error rates, and paired t-test were applied to scrutinize the accuracy of the accelerometer and the pedometer. The finding of this study was as follows: 1) The counts from accelerometer showed high correlation with the criterion measures, such as energy expenditure, MET values, and oxygen consumption from the indirect calorimetry. 2) The cut-off points of the physical activity intensity in the accelerometer was not matched with the MET values measured including low, moderate, and high intensity. 3) The walking steps from the pedometer showed high relationship with the step counts measured by the rater. 4) The mean error rate of the pedometer was 1.6%, which is low error. 5) The equivalence of the accelerometers and the pedometers were confirmed with the high reliability coefficients.

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