T-REX 삼축 가속도계의 다양한 부착위치에 따른 신체활동량 추정 타당도 검증
Validity Evaluation of the T-REX Triaxial Accelerometer To Measure Physical Activity by Exercise Types and T-REX Attachment Locations in Men and Women
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초록
이 연구의 목적은 새로 개발된 삼축 가속도계인 T-REX의 신체활동량 추정에 대한 타당도를 준거 도구(가스호흡분석기)와 참고 도구(가속도계)와의 비교를 통해 검증하는 것이다. 건강한 20대 남녀 50명은 운동자각인지도 12-14 수준으로 훌라후프, 스텝박스, 줄넘기와 제자리 걷기를 수행하였다. 대상자들은 운동을 수행하는 동안 T-REX(발목, 상완, 가슴, 허리, 손목 위치)와, ActiGraph(허리 위치), Actical(허리, 가슴 위치)을 착용하였으며, 산소섭취량이 동시에 측정되었다. 타당성은 피어슨 상관계수로 분석하였다. T-REX는 발목, 가슴, 허리 위치에서 스텝박스 운동과(r=.83-.91) 훌라후프 운동 시 상완과 손목 위치에서(r=.82-.84) 산소섭취량과 매우 강한 상관관계를 보였으며, 제자리 걷기 운동 시에는 상완과 손목에서 보통이상의 상관관계(r=.63-.71)를 나타내었다. T-REX는 두 종류의 참고도구와 비교했을 때 산소섭취량과 더 높은 상관관계를 보여, 신체활동 검사 도구로 충분히 상용화될 수 있을 것으로 판단된다.
Abstract
This study examined the validity of the T-REX accelerometer to measure physical activity in men and women comparing with Actigraph and Actical. Fifty healthy men and women completed four different types of exercise (step box, jump rope, Hula hoop, and on-site walking) at a perceived exertion intensity rated 12–14. Oxygen uptake (VO2) were assessed from all participants while assessing physical activity using T-REX (attached at the ankle, arm, chest, waist, and wrist) and, simultaneously, Actigraph (attached at waist) and Actical (attached at the waist and chest), respectively. VO2 was measured using the Cosmed K4b2 portablesystem. There were very strong to strong associations between T-REX and VO2 measured during Step box activity (T-REXs were attached at the ankle (r=.91), chest (r=.83), and waist (r=.86). There were also strong associations between T-REX and VO2 measured during Hula hoop activity (T-REXs were attached to the arm (r=.82) and wrist (r=.84). Also, there were significant associations between T-REX and VO2 measured during on-site walking at five locations (r=.63-.71). When compared with ActiGraph and Actical, T-REX showed higher associations with VO2, which indicates a superior instrument to measure physical activity. The T-REX has high validity with VO2 to measure physical activity including Step box activity in three locations (ankle, chest, and waist), Hula hoop activity in two locations (arm, wrist), and on-site walking in one location (ankle).
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