Hemmingsson Erik, Hellénius Mai-Lis, Ekelund Ulf, Bergström Jakob, Rössner Stephan
Department of Medicine (Huddinge), Obesity Unit, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden.
Obesity (Silver Spring). 2008 Jun;16(6):1308-13. doi: 10.1038/oby.2008.204. Epub 2008 Apr 3.
There are few established methods for promoting physical activity (PA) in the severely obese. Because social support is a potential method for promoting PA, we compared mean steps/day during 18 weeks in severely obese outpatients receiving either standard support (SS) or added support (AS).
Eighty severely obese outpatients from an obesity clinic were invited; 66 provided written consent, 55 were randomized, and 42 were included in final analyses (9 men, 33 women; age 44.4 +/- 13.1 years; BMI 41.9 +/- 5.5 kg/m(2)). All participants received a pedometer and a walking promotion booklet. In addition to SS, the AS group received ten 2-h group counseling sessions aimed at increasing weekly accumulated steps, every second week during the study. Each participant was asked to complete a 7-day walking diary every second week (10 observations).
Baseline steps/day was 6,912 for the AS group and 5,311 for the SS group (P = 0.023). Data at 18 weeks showed that the AS group recorded 10,136 steps/day and the SS group 6,118 steps/day (P = 0.024). There was no allocation x time interaction (P = 0.46). During the follow-up period as a whole, the AS group recorded 1,794 more steps/day than the SS group (P = 0.0074).
The AS group recorded more steps/day than the SS group, reaching a mean level of approximately 10,000 steps/day. However, the nonsignificant interaction between allocation x time suggests that this difference was present already at baseline and did not increase during follow-up.
在重度肥胖人群中，促进身体活动（PA）的既定方法很少。由于社会支持是促进PA的一种潜在方法，我们比较了接受标准支持（SS）或额外支持（AS）的重度肥胖门诊患者在18周内每天的平均步数。
邀请了一家肥胖诊所的80名重度肥胖门诊患者；66人提供了书面同意书，55人被随机分组，42人纳入最终分析（9名男性，33名女性；年龄44.4±13.1岁；体重指数41.9±5.5kg/m²）。所有参与者都收到了一个计步器和一本步行促进手册。除了SS，AS组在研究期间每隔一周接受十次为期2小时的小组咨询会议，旨在增加每周累计步数。要求每位参与者每隔一周完成一份7天的步行日记（共10次观察）。
AS组的基线每日步数为6912步，SS组为5311步（P = 0.023）。18周时的数据显示，AS组记录的每日步数为10136步，SS组为6118步（P = 0.024）。不存在分组×时间交互作用（P = 0.46）。在整个随访期间，AS组记录的每日步数比SS组多1794步（P = 0.007）。
AS组记录的每日步数比SS组多，平均达到约10000步/天。然而，分组×时间之间的交互作用不显著，这表明这种差异在基线时就已存在，且在随访期间没有增加。
