Department of Psychiatry and Human Behavior, Warren Alpert Medical School of Brown University, The Miriam Hospital Weight Control and Diabetes Research Center, Providence, Rhode Island, USA.
Department of Nutrition, University of Tennessee, Knoxville, Tennessee, USA.
Obesity (Silver Spring). 2017 Jun;25(6):1014-1021. doi: 10.1002/oby.21846. Epub 2017 Apr 24.
To evaluate a commercial online weight loss program and activity tracker, which are popular but have unknown efficacy.
Two hundred seventy-nine participants with BMI 27 to 40 kg/m were randomized to 12 months of the Weight Watchers Online program alone (WWO) or with the ActiveLink activity tracking device (WWO+AL) or an online newsletter (Control).
Weight losses at 3 months were significantly greater in WWO (2.7 kg [95% confidence interval (CI), 2.0-3.5 kg] than Control (1.3 kg [95% CI, 0.5-2.0 kg]; P = 0.01); neither differed from WWO+AL (2.0 kg [95% CI, 1.3-2.7 kg]; Ps > 0.56). Significantly more WWO participants (24.5%) achieved ≥ 5% weight loss at 3 months than Control (9.4%) (P = 0.01); neither differed from WWO+AL (17.6%) (Ps = 0.13-0.28). At 12 months, there were no significant differences between groups in weight loss (Ps > 0.52). WWO (25.5%) continued to have a higher proportion of participants achieving ≥ 5% weight loss than Control (12.9%) (P = 0.04); neither differed from WWO+AL (14.3%) (Ps > 0.10). There were no significant between-group differences in change in physical activity (Ps > 0.17).
WWO produced significantly more weight loss at 3 months relative to Control, but not at 12 months. Significantly more WWO than Control participants lost ≥ 5% at both 3 and 12 months. Participants receiving an activity tracking device did not achieve greater weight loss or physical activity increases than those in a Control condition.
评估一款广受欢迎但疗效未知的商业在线减肥计划和活动追踪器。
将 279 名 BMI 为 27 至 40kg/m 的参与者随机分为 12 个月的 Weight Watchers Online 计划组（WWO）、带 ActiveLink 活动追踪器的 WWO 组（WWO+AL）或在线新闻通讯组（对照组）。
3 个月时，WWO 组体重下降明显大于对照组（2.7kg [95%置信区间（CI），2.0-3.5kg]，对照组为 1.3kg [95% CI，0.5-2.0kg]；P=0.01），与 WWO+AL 组（2.0kg [95% CI，1.3-2.7kg]；Ps>0.56）相比也无差异。3 个月时，更多的 WWO 组（24.5%）达到了≥5%的体重下降，而对照组（9.4%）（P=0.01）；与 WWO+AL 组（17.6%）相比也无差异（Ps=0.13-0.28）。12 个月时，各组之间的体重下降无显著差异（Ps>0.52）。WWO（25.5%）继续比对照组（12.9%）有更高比例的参与者达到≥5%的体重下降（P=0.04）；与 WWO+AL 组（14.3%）相比也无差异（Ps>0.10）。各组之间的身体活动变化无显著差异（Ps>0.17）。
与对照组相比，WWO 在 3 个月时体重下降显著更多，但在 12 个月时则不然。在 3 个月和 12 个月时，与对照组相比，更多的 WWO 参与者体重下降≥5%。与对照组相比，接受活动追踪器的参与者体重下降或身体活动增加并无显著增加。
