GT9X의 타당도, 신뢰도 검증
Verification of Validity and Reliability of GT9X
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본 연구는 GT9X의 신체활동 단계별 추정치의 차이를 검증하는 데 목적이 있다. 실험 대상자는 34명으로 선정하였으며, 준거 검사 도구로는 K4b²를 사용하였다. 에너지소비량을 측정하기 위해 사용된 프로토콜은 앉기, 누워 있기, TV 시청하기, 3.2km/h 트레드밀, 걸레질하기, 4.8km/h 트레드밀, 8km/h 트레드밀, cool down 등 8가지 활동으로진행하였으며 각 활동이 끝난 후 5분씩 휴식을 취하였다. 이에 따라 나타난 결과는 독립 t-test와 Bland Altman plot을 이용하여 타당도를 검증하였으며, 상관분석을 이용하여 결과를 제공하였다. 또한 GT9X의 신뢰도 검증을위해 one-way(4RM) ANOVA를 사용하였다. 연구결과, 중강도 활동인 3.2km/h 트레드밀, 4.8km/h 트레드밀, cool down에서 신체활동 추정의 타당도 있는 결과를 확인할 수 있었다. GT9X는 앉아서 하는 활동을 할 때 신체활동을과소평가하는 것으로 나타났지만, 3.2km/h 트레드밀, 4.8km/h 트레드밀에서 적용 가능한 것으로 나타났다. Bland-Altman 결과, 누워있는 자세는 8km/h 트레드밀에서 작은 편차의 신뢰구간을 보였으며, 1개 또는 2개를제외한 모든 자료가 신뢰구간에 포함되었다. GT9X를 이용하여 신체 활동량을 추정할 때 오차를 줄이기 위해서는측정하려는 활동에 따라 부착 위치를 선택해야 하며, 부착 위치 선택 후 측정된 VM 값을 에너지소비량으로 환산해야함을 알 수 있다.
Abstract
The purpose of this study is to verify the difference in the estimated value of GT9X physical activity stages. 34 participants were selected as experimental subjects, and K4b² was used as a reference test tool. The protocol used to measure energy expenditure was conducted with eight activities: sitting, lying down, watching TV, 3.2km/h treadmill, mopping, 4.8m/h treadmill, 8km/h treadmill, and cool down, and a 5-minute rest was taken after each activity. The results were verified for validity using independent t-test and Bland Altman plot, and the results were provided using correlation analysis. In addition, one-way(4RM) ANOVA was used to verify the reliability of GT9X. The results of the study confirmed the validity of physical activity estimation in moderate-intensity activities such as 3.2km/h treadmill, 4.8km/h treadmill, and cool down. GT9X was found to underestimate physical activity during sedentary activities, but was applicable to 3.2km/h treadmill and 4.8km/h treadmill. The Bland-Altman results showed a small confidence interval for the supine position on the 8 km/h treadmill, and all data except one or two were included in the confidence interval. In order to reduce the error when estimating physical activity using GT9X, it is necessary to select the attachment location according to the activity to be measured, and after selecting the attachment location, the measured VM value should be converted into energy expenditure.
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