성인과 노인의 가속도계 신체활동 강도기준치
Accelerometer Physical Activity Intensity Cut-points for Adults and Older Adults
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참고문헌
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초록
건강을 위한 신체활동 가이드라인 업데이트에서 고강도 활동이 강조됨에 따라 신체활동에서 고강도의 분류가 주요한 관심으로 대두되었다. 객관적 신체활동 측정도구 중 가장 대중적인 연구용 가속도계인 ActiGraph의 신체활동강도에 따른 활동카운트가 소아와 성인 등 연령에 따라 다름에도 불구하고 성인의 노화에 따른 연령대별 신체활동강도의 기준치(cut-point)에 대한 연구는 아직까지 부족하다. 본 연구의 목적은 ActiGraph 가속도계의 연령대별 신체활동 강도(저·중·고)에 따른 활동카운트(counts)의 차이를 검증하고, 이를 기반으로 한 연령대별 신체활동 강도기준치를 제시하는 것이다. 연구참여자(n=239, 여자 55.2%, 44.7±14.5세)는 다양한 강도의 신체활동을 수행하였으며, 건강에 무리가 없는 성인으로 연령대별(20-29, 30-39, 40-49, 50-59, 60-69세)로 편의 추출하였다. 가속도계는 오른쪽 골반 윗부분에 착용하였으며, 일축과 삼축 데이터를 분석에 사용하였다. 본 연구에는 실험실 내 통제된 상황에서 트레드밀을 이용하여 다양한 신체활동 강도의 프로토콜을 수행하도록 하였다. 준거 신체활동 강도는 신체활동목록표를 기준으로 하였으며, 강도에 따른 연령대별 가속도계 분당 활동카운트(counts per minute; CPM)의 차이를 검증하였다. 또한 연령대별 가속도계 값의 차이를 기반으로 receiver operating characteristic(ROC)-curve 분석방법을 이용하여 일축과 삼축 CPM에 대한 신체활동 강도기준치를 제시하였다. 신체활동 강도 분류에 따른 연령대별 CPM은 저강도와 중강도는 차이를 보이지 않았으나, 고강도에서는 일축과 삼축 모두 노인(60-69세)이 성인(20-59세) 보다 유의하게 낮았다. 중강도와 고강도의 일축 가속도계 신체활동 강도기준치는 성인의 경우 2098과6087CPM, 노인은 각각 1840, 4835CPM로 분류되었다. 삼축 가속도계의 신체활동 중강도와 고강도 기준치는 성인에서 각각 2878, 6925CPM, 노인에서 2603과 5344CPM으로 구분되었다. 결론적으로 ActiGraph 신체활동 고강도의 기준치는 성인의 연령대를 고려하여 적용하여야 한다. 이러한 결과는 노인의 중·고강도 신체활동 참여 시간과 중재, 또는 신체활동 패턴을 연구하고자 할 때 유용하게 사용될 수 있을 것으로 판단된다.
Abstract
Regular physical activity (PA) provides health benefits in individuals across ages. Given that PA recommendations for health benefits are intensity specific, it is important to differentiate PA intensities. The ActiGraph is the most commonly used accelerometer to objectively measure PA in research. Cut-points differ across age ranges. However, it is a paucity of research to determine specific cut-points for different age groups using the same protocols. Thus, the purposes of this study were to compare activity counts across age groups, to develop the age-specific accelerometer cut-points to classify PA intensities. The participants(n=239, woman 55.2%, 44.72±14.48yr) were divided into different age groups (20-29, 30-39, 40-49, 50-59, ≥60 yr). The participants in the calibration study performed light, moderate and vigorous activities on a treadmill. All the participants wore the GT3X on the right hip. The counts per minute (CPM) of vertical axis (VT) and vector magnitudes (VM) of the GT3X were analyzed. Receiver operating characteristic (ROC) curve was utilized to determine the cut-points of PA intensities. No differences in CPM were found in light and moderate PA intensity across age groups. However, there were significant difference in the both VT and VM by age group according to vigorous PA intensity. The activity counts on VT and VM in the vigorous activities were reduced in the older adults (60~69yr) from the adults (20~59yr). The VT cut-points for moderate and vigorous intensity were 2098 and 6087 CPM in the adults and were 1840 and 4835 CPM in the older adults, respectively. The VM cut-points for moderate and vigorous activities were 2878 and 6925 CPM in the adults and were 2603 and 5344 CPM in the older adults, respectively. The activity counts were age-specific, especially in vigorous activities. Thus, age-specific cut-points should be applied using accelerometers.
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