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보행수 기반 좌식시간 측정의 정확성과 활용 방향

Accuracy and Applicability of Step-Based Measure of Sitting Time

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초록

최근 좌식행동을 줄이고자 스마트폰, 웨어러블 장치를 통해 측정한 보행수를 바탕으로 좌식시간을 추정해 사용자에게 피드백하는 어플리케이션이 소개되고 있다. 그러나 보행수를 기반으로 좌식시간을 추정하는 것이 타당한 방법인지에 대한 과학적 근거는 미흡하다. 따라서 본 연구의 목적은 보행수가 좌식시간을 정확하게 추 정할 수 있는 기준인지 알아보고 수렴타당도 근거를 수집하는 것이었다. 이를 위해 2014-2015년도 국민건강 영양조사 중 19~65세 성인 1,768명의 Actigraph GT3X+ 가속도계 자료를 가공하여 다음과 같이 분석하였 다. 첫째, 단위시간(1분)당 보행수를 기준으로 한 좌식행동 판별 결과가 기존 방법인 신체활동 강도(움직임강도 수로서 99cpm)를 기준으로 판별한 결과와 일치하는 정도를 알아보았다. 그 결과 첫째, ROC-AUC=0.97로 보 행수는 신체활동 강도를 대체할 수 있는 매우 정확한 좌식시간 측정 기준이 될 수 있는 것으로 나타났다. 둘 째, 단위시간을 좌식시간으로 판정하는데 보행수 절단점이 2보(3보=저강도 신체활동)일 때 민감도는 91.53%, 특이도는 90.18%, 정확도는 90.96으로 가장 높았다. 셋째, 2보 절단점을 적용했을 때 가속도계 착용시간과 신체활동 강도, 총 좌식시간은 과소추정, 좌식행동 지속시간은 과대추정하게 되는 것으로 나타났으며, 그 상대 오차는 차례대로 각각 12.10%, 6.27%, 11.15%였다. 스마트폰 및 웨어러블 장치에 적용하기 위한 기초연구로 서 본 연구는 보행수가 좌식행동을 측정할 수 있는 간소하면서도 합리적인 기준이 될 수 있다는 점을 시사한 다. 후속연구로 직접관찰법이나 자세변화까지 탐지할 수 있는 신체활동 모니터를 준거측정도구로 한 타당도 검 증, 보행수 기반 알고리즘을 스마트 기기에 적용하기 위한 제반사항 검토를 제안하였다

Abstract

The purpose of this study was to test feasibility of step-based sitting time measure and its concurrent validity. Physical activity monitors sub-data of 2014-2015 Korea Nutrition and Health Examination Survey (N=768, age=19-65 years) were processed and analyzed to compare sitting time detected by step counts versus intensity counts (criterion). ROC-AUC=.97 showed that step count is a very accurate way to detect sitting time. The highest accuracy (=90.96%, sensitivity=91.53%, specificity=90.18%) was achieved when step count threshold to distinguish sitting time from light intensity physical activity was set to ˂3 steps/min. In comparison to the intensity-count based sitting time detection, monitor wear time and total sitting time were underestimated, and duration of sitting was overestimated by step count-based detection. The results suggest that step count can be a simple but accurate algorithm to measure sitting time. Future studies should consider employing direct observation and/or inclinometer as criterion measures.

참고문헌 (41)

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