Use of the Fitbit to Measure Adherence to a Physical Activity Intervention Among Overweight or Obese, Postmenopausal Women: Self-Monitoring Trajectory During 16 Weeks
Use of the Fitbit to Measure Adherence to a Physical Activity Intervention Among Overweight or Obese, Postmenopausal Women: Self-Monitoring Trajectory During 16 Weeks
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DOI：
10.2196/mhealth.4229
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发表时间：
2015-10-01
影响因子：
5
通讯作者：
Morey, Brittany L.
中科院分区：
文献类型：
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作者：
Cadmus-Bertram, Lisa;Marcus, Bess H.;Morey, Brittany L.
背景：直接面向消费者的跟踪器和设备通过提供一种简单而愉快的方式帮助参与者自我监控他们的行为，有可能加强基于理论的体力活动干预。这些设备的第二个好处是，研究人员有机会在几周甚至几个月的时间里客观地跟踪对体力活动目标的遵守情况，而不是依赖自我报告或少量的加速度计磨损周期。使用消费者跟踪器持续监测依从性有相当大的潜力来加强体力活动研究，但在这个快速发展的领域发表的研究很少。目的：本研究的目的是评估通过Fitbit Tracker测量的为期16周的自我监控干预措施中体力活动依从性的轨迹。每个参与者都接受了为期16周的基于技术的干预，使用了Fitbit体力活动跟踪器和网站。研究的总体目标是每周150分钟的中等强度到剧烈的体力活动(MVPA)和每天10,000步；然而，目标是为每个参与者单独设定的，并在第4周根据进展情况进行更新。依从性数据由Fitbit收集，并由Fitabase汇总。参与者还在干预前7天和第16周再次佩戴Actigraph GT3X+加速度计。结果：在112个干预天数中，95%的参与者每天佩戴Fitbit的时间中位数为10小时或更长，在研究期间佩戴的时间没有显著下降。在干预过程中，受试者平均每天走7540步(SD 2373)，每周累积82分钟(SD 43)的“相当活跃”和“非常活跃”分钟。在第4周，80%(20/25)的女性选择维持/增加她们的个人MVPA目标，72%(18/25)的参与者选择维持/增加她们的阶跃目标。体力活动水平在3周达到峰值后相对稳定，16周后STEPS和MVPA分别只有8%(P=.06)和14%(P=.05)的小幅下降。结论：这些数据表明，复杂的、直接面向消费者的活动跟踪器鼓励持续16周的高水平自我监控。还需要进一步的研究，以确定如何促进体力活动的额外收益，并评估Fitbit跟踪器作为慢性病预防战略的一部分的长期效用。
Background: Direct-to-consumer trackers and devices have potential to enhance theory-based physical activity interventions by offering a simple and pleasant way to help participants self-monitor their behavior. A secondary benefit of these devices is the opportunity for investigators to objectively track adherence to physical activity goals across weeks or even months, rather than relying on self-report or a small number of accelerometry wear periods. The use of consumer trackers for continuous monitoring of adherence has considerable potential to enhance physical activity research, but few studies have been published in this rapidly developing area.Objective: The objective of the study was to assess the trajectory of physical activity adherence across a 16-week self-monitoring intervention, as measured by the Fitbit tracker.Methods: Participants were 25 overweight or obese, postmenopausal women enrolled in the intervention arm of a randomized controlled physical activity intervention trial. Each participant received a 16-week technology-based intervention that used the Fitbit physical activity tracker and website. The overall study goal was 150 minutes/week of moderate to vigorous intensity physical activity (MVPA) and 10,000 steps/day; however, goals were set individually for each participant and updated at Week 4 based on progress. Adherence data were collected by the Fitbit and aggregated by Fitabase. Participants also wore an ActiGraph GT3X+ accelerometer for 7 days prior to the intervention and again during Week 16.Results: The median participant logged 10 hours or more/day of Fitbit wear on 95% of the 112 intervention days, with no significant decline in wear over the study period. Participants averaged 7540 (SD 2373) steps/day and 82 minutes/week (SD 43) of accumulated "fairly active" and "very active" minutes during the intervention. At Week 4, 80% (20/25) of women chose to maintain/increase their individual MVPA goal and 72% (18/25) of participants chose to maintain/increase their step goal. Physical activity levels were relatively stable after peaking at 3 weeks, with only small declines of 8% for steps (P=.06) and 14% for MVPA (P=.05) by 16 weeks.Conclusions: These data indicate that a sophisticated, direct-to-consumer activity tracker encouraged high levels of self-monitoring that were sustained over 16 weeks. Further study is needed to determine how to motivate additional gains in physical activity and evaluate the long-term utility of the Fitbit tracker as part of a strategy for chronic disease prevention.