Katayama Yasutomi, Sasai Hiroyuki, Nagao Yoko, Eto Miki, Tanaka Kiyoji
Faculty of Education, Kogakkan University.
Nihon Koshu Eisei Zasshi. 2013 Jun;60(6):346-55.
To compare the effects of weekly or bi-weekly dietary sessions with the same number of total lecture hours, periods, and lecture contents on weight loss, dropouts during the intervention, and the weight loss maintenance after 1 year.
The study included 52 middle-aged women with at least 1 risk factor for cardiovascular disease (i.e., obesity, hypertension, dyslipidemia, and hyperglycemia) who were encouraged to lose weight. Thirty-seven women were assigned to the weekly class (self-selected weekly class group: n=26) or the bi-weekly class (self-selected bi-weekly class group: n=11) based on their preference. Fifteen women were assigned to the bi-weekly class against their will (bi-weekly class group). All groups participated in the same number of sessions (total, 26 h), and were instructed to reduce their dietary intakes to 1200 kcal/day for 13 weeks. The self-selected weekly class group attended a 2-h instructional session every week, whereas both the bi-weekly class groups received 1-h sessions twice a week. Data on the body weight of the participants was collected 1 year after the intervention using a self-administered questionnaire via mail.
The self-selected bi-weekly class group had significantly fewer dropouts (self-selected weekly class group: 5 persons, 19.2%; self-selected bi-weekly class group: 1 person, 9.0%; bi-weekly class group: 8 persons, 53.3%; P<0.05). There was a significant decrease in weight (P<0.05) in all 3 groups during the intervention (self-selected weekly class group: -4.3±2.7 kg, self-selected bi-weekly class group: -6.7±3.0 kg, bi-weekly class group: -6.0±3.4 kg). However, weight loss in the self-selected bi-weekly class group was significantly greater than that in the other 2 groups. A significant change in body weight at the 1-year follow-up was not observed in any group (self-selected weekly class group: +0.4±1.3 kg, self-selected bi-weekly class group: -0.1±2.3 kg, bi-weekly class group: +0.5±0.6 kg). Repeated-measures ANOVA (time×group) revealed no significant interactions in weight loss.
These results suggest that a greater frequency of dietary sessions contributes to weight loss, while a lesser frequency of dietary sessions contributed to a decrease in questionnaire recovery rates. The dropout rate in the self-selected weekly and bi-weekly class groups was lesser than that in the bi-weekly class group. Therefore, dietary sessions tailored to the needs of the participants might decrease the dropout rate.
比较总授课时长、课时数和授课内容相同的每周或每两周一次饮食课程对体重减轻、干预期间的退出率以及1年后体重减轻维持情况的影响。
该研究纳入了52名患有至少一种心血管疾病风险因素（即肥胖、高血压、血脂异常和高血糖）且被鼓励减肥的中年女性。根据她们的偏好，37名女性被分配到每周课程组（自选每周课程组：n = 26）或每两周课程组（自选每两周课程组：n = 11）。15名女性被强制分配到每两周课程组（每两周课程组）。所有组参加的课程数量相同（总计26小时），并被指导在13周内将饮食摄入量减少至每天1200千卡。自选每周课程组每周参加一次2小时的指导课程，而两个每两周课程组每周参加两次1小时的课程。干预1年后，通过邮件使用自填问卷收集参与者的体重数据。
自选每两周课程组的退出人数显著较少（自选每周课程组：5人，19.2%；自选每两周课程组：1人，9.0%；每两周课程组：8人，53.3%；P<0.05）。干预期间，所有3组的体重均显著下降（P<0.05）（自选每周课程组：-4.3±2.7千克，自选每两周课程组：-6.7±3.0千克，每两周课程组：-6.0±3.4千克）。然而，自选每两周课程组的体重减轻显著大于其他2组。在1年随访时，任何组的体重均未观察到显著变化（自选每周课程组：+0.4±1.3千克，自选每两周课程组：-0.1±2.3千克，每两周课程组：+0.5±0.6千克）。重复测量方差分析（时间×组）显示体重减轻方面无显著交互作用。
这些结果表明，饮食课程频率较高有助于体重减轻，而频率较低则导致问卷回收率下降。自选每周和每两周课程组的退出率低于每两周课程组。因此，根据参与者需求定制的饮食课程可能会降低退出率。
