Association between Self-Weighing and Percent Weight Change: Mediation Effects of Adherence to Energy Intake and Expenditure Goals

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• 作者：Yaguang Zheng ; PhD ; MSN ; RN ; ^{yaguang.zheng@bc.edu" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Susan M. Sereika ; PhDAuthor Vitae ; Linda J. Ewing ; PhD ; RNAuthor Vitae ; Cynthia A. Danford ; PhD ; RNAuthor Vitae ; Martha Ann Terry ; PhDAuthor Vitae ; Lora E. Burke ; PhD ; MPH ; FAHA ; FAANAuthor Vitae
• 关键词：Self-weighing ; Weight loss ; Behavior ; Energy intake ; Energy expenditure
• 刊名：Journal of the Academy of Nutrition and Dietetics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：116
• 期：4
• 页码：660-666
• 全文大小：547 K

文摘

To date, no investigators have examined electronically recorded self-weighing behavior beyond 9 months or the underlying mechanisms of how self-weighing might impact weight change.

Objective

Our aims were to examine electronically recorded self-weighing behavior in a weight-loss study and examine the possible mediating effects of adherence to energy intake and energy expenditure (EE) goals on the association between self-weighing and weight change.

Design

This was a secondary analysis of the self-efficacy enhancement arm of the Self Efficacy Lifestyle Focus (SELF) trial, an 18-month randomized clinical trial.

Participants/setting

The study was conducted at the University of Pittsburgh (2008-2013). Overweight or obese adults with at least one additional cardiovascular risk factor were eligible.

Intervention

Participants in the self-efficacy enhancement arm were given a scale (Carematix, Inc) and instructed to weigh themselves at least 3 days per week or every other day. The scale date- and time-stamped each weighing episode, storing up to 100 readings.

Main outcome measures

Weight was assessed every 6 months. Adherence to energy intake and EE goals was calculated on a weekly basis using paper diary data.

Statistical analyses performed

Linear mixed modeling and mediation analyses were used.

Results

The sample (n=55) was 80% female, 69% non-Hispanic white, mean (standard deviation) age was 55.0 (9.6) years and body mass index (calculated as kg/m²) was 33.1 (3.7). Adherence to self-weighing declined over time (P<0.001). From baseline to 6 months, there was a significant mediation effect of adherence to energy intake (P=0.02) and EE goals (P=0.02) on the association between adherence to self-weighing and percent weight change. Mediation effects were not significant during the second and third 6-month periods of the study.

Conclusions

Objectively measured adherence to self-weighing declined over 18 months. During the first 6 months, self-weighing directly impacted weight change and indirectly impacted weight change through changes in energy intake and EE.