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Predicting Stage of Exercise Among Patients with Type 2 Diabetes: A Test of the Extended Theory of Planned Behavior

Authors Gao M, Chen X, Sun X, Wang F, Fan L, Sun X

Received 31 October 2019

Accepted for publication 1 January 2020

Published 14 February 2020 Volume 2020:14 Pages 277—285


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Naifeng Liu

Min Gao,1,2 Xueying Chen,1 Xin Sun,1 Fengbin Wang,1 Lishi Fan,1 Xinying Sun1

1School of Public Health, Peking University Health Science Center, Beijing, People’s Republic of China; 2Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK

Correspondence: Xinying Sun
School of Public Health, Peking University Health Science Center, 38, Xueyuan Road, Haidian District, Beijing 100191, People’s Republic of China
Tel +86 136 9121 2050

Purpose: This study aimed to predict stage of exercise among Chinese patients with type 2 diabetes by using an extended theory of planned behavior model (TPB) incorporating descriptive norm and self-identity.
Patients and Methods: Participants (N=791) were included in a cross-sectional study. Structural equation modeling was used to explain how the extended TPB could predict the stage of exercise.
Results: The model accounted for 41% of the variance in stage of exercise and 81.1% of the variance in intention. Intention (β=0.359, P< 0.01) and self-identity (β=0.236, P< 0.001) had a direct effect on stage of exercise. Self-identity (β=0.261, P< 0.001), descriptive norm (β=0.035, P< 0.05) and PBC (β=0.683, P< 0.001) were strong predicators of intention. The effects of self-identity and PBC on behavior were significantly mediated via intention. Age, BMI and stage of diet behavior were found to be significantly related to intention and behavior.
Conclusion: This study has tested the usefulness of the extended TPB for explaining exercise in Chinese diabetic patients. To promote patients to start or continue exercising, interventions should target self-identity and controllability for physical activity.

Keywords: theory of planned behavior, stage of change, exercise, descriptive norm, self-identity

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