가스분석 결과를 기준으로 동작감지기 엑티칼, 엑티그라프의 타당도 = The Accuracy of the Accelerometers (Actical and Actigraph) among Korean People

다국어 초록 (Multilingual Abstract)

Background: Nowadays, decreased physical activity is considered to be a contributor to increase the prevalence of many diseases such as obesity, coronary heart disease and so on. Many researches demonstrated that regular physical activity reduce all cause mortality. To increase the physical activities of the population, accurate estimation of the activities is needed. Actical and actigraph are confirmed as accurate tools to measure physical activities. But the target populations of the validity studies were not Asian people. Therefore, the accuracy of the accelerometers should be confirmed in Asian people. The accuracy of the tools could be different. Therefore head to head comparison study between the tools would be needed.
Methods: Thirty volunteers from the community, ages over 20 yrs, were recruited. The participants put on the two accelerometers (Actical, Actigraph) on the waists, secured with elastic belts, and performed a session of rest and three structured activities (two walking speeds, 4 km/hr and 6 km/hr, and one jogging speed, 8 km/hr). During each activity, expired respiratory gases were collected, and oxygen consumption (VO2) was measured by indirect calorimetry (Model Quark β2Ⓡ). The calories measured by gas analyzer and two accelerometers were compared by correlation analysis using SPSS program.
Results: Pearson correlation coefficient between gas analyzer and two accelerometers was calculated at three structured activities. The r in Actical was 0.747, 0.785, and 0.677, at speed of 4, 6, 8 km/hr, respectively (P＜0.05), and the same measures in Actigraph was 0.617, 0.737, and 0.530 (P＜0.05), respectively. Pearson correlation coefficient was also calculated between the two accelerometers, and the r was 0.881, 0.927, and 0.824, at each speed.
Conclusion: The Actical and Actigraph are valid tools for measuring physical activities in Korean people. (

국문 초록 (Abstract)

연구배경: 신체 활동이 적음은 비만, 심혈관계 질환 등 많은 질병의 위험인자로 대두되고 있고, 규칙적인 신체활동은 모든 원인의 사망률을 감소시킨다는 연구결과가 있다. 따라서 질병예방과 건강증진을 위하여 신체활동을 권고할 필요가 있고, 이를 위해서는 신체활동량을 정확하게 측정하고 평가할 수 있는 방법이 필요하다. 서구의 연구에서 엑티칼Ⓡ(Mini Mitter company, USA)과 엑티그라프Ⓡ (LLC, USA)는 정확한 신체활동량 측정이 가능한 기구로 평가되고 있지만, 동양인을 대상으로 두 기구의 타당도를 살펴 본 연구는 없다. 따라서 우리나라 성인에서 두 동작감지기의 정확도를 확인하고, 두 기구간의 차이를 평가할 필요가 있다.
방법: 건강한 20세 이상의 성인 지원자를 대상으로 하였다. 참가자들은 허리에 두 개의 동작감지기(엑티칼, 엑티그라프)를 착용한 상태에서, 2단계의 보행속도의 신체활동(4 km/hr, 6 km/hr)과, 조깅속도의 신체활동(8 km/hr)을 수행하였다. 일련의 신체활동을 하는 동안 가스분석기를 통해 산소소모량을 측정하여 소모된 칼로리를 계산하였다. 가스분석기와 두 개의 동작감지기로 측정된 칼로리의 상관계수를 구하여, 각각의 타당도를 평가하였고, 두 동작감지기간 측정값의 차이를 살펴보았다.
결과: 본 연구에서 사용된 두 가지 동작감지기에서 측정된 칼로리와 가스분석기를 통해 측정된 칼로리 사이의 피어슨 상관계수를 구하였다. 그 결과 4 km/hr, 6 km/hr, 8 km/hr의 신체활동 단계별 r값은 각각 엑티칼에서 0.747, 0.785, 0.677로, 엑티그라프에서 0.617, 0.737, 0.530으로 통계적으로 유의한 상관관계를 보였으며, 두 기구간의 측정값 사이에도 그 값이 0.881, 0.927, 0.824로 통계적으로 유의한 상관관계를 보였다.
결론: 본 연구에서 사용된 3차원 동작감지기(엑티칼, 엑티그라프)는 우리나라 성인에서 신체활동량을 평가하기 위한 도구로서 유용하다.

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