Scott Joseph J, Rowlands Alex V, Cliff Dylan P, Morgan Philip J, Plotnikoff Ronald C, Lubans David R
Priority Research Centre Physical Activity and Nutrition, University of Newcastle, Australia.
Diabetes Research Centre, University of Leicester, Leicester General Hospital, UK; NIHR Leicester-Loughborough Diet, Lifestyle and Physical Activity Biomedical Research Unit, UK; Alliance for Research in Exercise, Nutrition and Activity (ARENA), Sansom Institute for Health Research, Division of Health Sciences, University of South Australia, Australia.
J Sci Med Sport. 2017 Dec;20(12):1101-1106. doi: 10.1016/j.jsams.2017.04.017. Epub 2017 Apr 21.
To determine the comparability and feasibility of wrist- and hip-worn accelerometers among free-living adolescents.
89 adolescents (age=13-14years old) from eight secondary schools in New South Wales (NSW), Australia wore wrist-worn GENEActiv and hip-worn ActiGraph (GT3X+) accelerometers simultaneously for seven days and completed an accelerometry behavior questionnaire.
Bivariate correlations between the wrist- and hip-worn out-put were used to determine concurrent validity. Paired samples t-test were used to compare minutes per day in moderate-to-vigorous physical activity (MVPA). Group means and paired sample t-tests were used to analyze participants' perceptions of the wrist- and hip-worn monitoring protocols to assist with determining the feasibility.
Wrist-worn accelerometry compared favorably with the hip-worn in average activity (r=0.88, p<0.001) and MVPA (r=0.84 p<0.001, mean difference=3.54min/day, SD=12.37). The wrist-worn accelerometer had 50% fewer non-valid days (75 days, 12%) than the hip-worn accelerometer (n=152, 24.4%). Participants reported they liked to wear the device on the wrist (p<0.01), and that it was less uncomfortable (p=0.02) and less embarrassing to wear on the wrist (p<0.01). Furthermore, that they would be more willing to wear the device again on the wrist over the hip (p<0.01).
Our findings reveal there is a strong linear relationship between wrist- and hip-worn accelerometer out-put among adolescents in free-living conditions. Adolescent compliance was significantly higher with wrist placement, with participants reporting that it was more comfortable and less embarrassing to wear on the wrist.
确定在自由生活的青少年中，佩戴于手腕和髋部的加速度计的可比性和可行性。
来自澳大利亚新南威尔士州（NSW）八所中学的89名青少年（年龄=13 - 14岁）同时佩戴手腕式GENEActiv加速度计和髋部佩戴的ActiGraph（GT3X +）加速度计七天，并完成一份加速度计行为问卷。
使用手腕和髋部佩戴式输出之间的双变量相关性来确定同时效度。使用配对样本t检验来比较中度至剧烈身体活动（MVPA）中的每日分钟数。使用组均值和配对样本t检验来分析参与者对腕部和髋部佩戴监测方案的看法，以协助确定可行性。
手腕佩戴式加速度计在平均活动量（r = 0.88，p < 0.001）和MVPA（r = 0.84，p < 0.001，平均差异= 3.54分钟/天，SD = 12.37）方面与髋部佩戴式加速度计相比表现良好。手腕佩戴式加速度计的无效天数（75天，12%）比髋部佩戴式加速度计（n = 152，24.4%）少50%。参与者报告说他们喜欢将设备戴在手腕上（p < 0.01），并且戴在手腕上不太舒服（p = 0.02）且不那么尴尬（p < 0.01）。此外，他们更愿意再次将设备戴在手腕上而不是髋部上（p < 0.01）。
我们的研究结果表明，在自由生活条件下，青少年手腕和髋部佩戴的加速度计输出之间存在很强的线性关系。青少年对手腕佩戴的依从性明显更高，参与者报告说戴在手腕上更舒适且不那么尴尬。
