Reciprocal effects of treatment-induced increases in exercise and improved eating, and their psychosocial correlates, in obese adults seeking weight loss: a field-based trial

International Journal of Behavioral Nutrition and Physical Activity

Kandice J Porter¹  James J Annesi¹ 

[1] Department of Health Promotion and Physical Education, Kennesaw State University, 1000 Chastain Road, Kennesaw, GA 30144, USA

关键词: Reciprocal effects;    Obesity;    Cognitive-behavioral;    Nutrition;    Exercise;   

Others  :  805922
DOI  :  10.1186/1479-5868-10-133

 received in 2013-06-09, accepted in 2013-11-28,  发布年份 2013

【 摘 要 】

Background

A better understanding of interrelations of exercise and improved eating, and their psychosocial correlates of self-efficacy, mood, and self-regulation, may be useful for the architecture of improved weight loss treatments. Theory-based research within field settings, with samples possessing high probabilities of health risks, might enable rapid application of useful findings.

Methods

Adult volunteers with severe obesity (body mass index [BMI] 35–50 kg/m²; age = 43.0 ± 9.5 y; 83% female) were randomly assigned to six monthly cognitive-behavioral exercise support sessions paired with either group-based nutrition education (n = 145) or cognitive behavioral methods applied to improved eating (n = 149). After specification of mediation models using a bias-corrected bootstrapping procedure, a series of reciprocal effects analyses assessed: a) the reciprocal effects of changes in exercise and fruit and vegetable intake, resulting from the treatments, b) the reciprocal effects of changes in the three psychosocial variables tested (i.e. self-efficacy, mood, and self-regulation) and fruit and vegetable change, resulting from change in exercise volume, and c) the reciprocal effects of changes in the three psychosocial variables and exercise change, resulting from change in fruit and vegetable intake.

Results

Mediation analyses suggested a reciprocal effect between changes in exercise volume and fruit and vegetable intake. After inclusion of psychosocial variables, also found were reciprocal effects between change in fruit and vegetable intake and change in mood, self-efficacy for controlled eating, and self-regulation for eating; and change in exercise volume and change in mood and exercise-related self-regulation.

Conclusion

Findings had implications for behavioral weight-loss theory and treatment. Specifically, results suggested that treatments should focus upon, and leverage, the transfer effects from each of the primary weight-loss behaviors (exercise and healthy eating) to the other. Findings on psychosocial correlates of these behavioral processes may also have practical applications.

【 授权许可】

   
2013 Annesi and Porter; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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