Purpose To examine the association between change in moderate-to-vigorous physical activity (MVPA) and sedentary behavior (SB) over a 6-month period with physiological and psychological factors in adults with type 2 diabetes (T2D).
Methods Participants included 26 middle-aged (mean age=56.1±10.8 years; 42% women), overweight/obese (mean body mass index (BMI) =37.22±8.78 kg/m2) adults who had been diagnosed with T2D within the past 5 years (mean HbA1c=7.81%). Participants underwent a physical examination, blood tests, and psychological questionnaires, including a self-report questionnaire that assessed the consumption of high glycemic and low glycemic load foods. Participants wore an Actigraph accelerometer for 7 days to assess MVPA and SB. All measures were collected at baseline and at the 6-month follow-up. Spearman rank correlations and regression models were conducted to examine the relationship between activity variables, and the association of activity measures with health outcomes at the 6-month follow-up.
Results Decreases in duration of SB bouts and increases in MVPA were associated with decreased levels of HbA1c (p<0.05). Over 50% of the variance in HbA1c levels could be attributed to changes in MVPA and SB.
Conclusions MVPA and SB were independently associated with diabetes-related health outcomes. Results suggest that emphasis should be placed on increasing MVPA while decreasing SB, particularly duration of SB bouts. This suggests that even small changes in daily behavior may contribute to improvement in diabetes-related health outcomes.
- Physical Activity and Health
- Psychosocial Factors
- Sedentary Behaviors
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Contributors DC was the principle investigator on the project, helped to conceptualize the design of the project, supervised the data collection, and helped to prepare and revise the final manuscript. JMG helped to conceptualize the design of the project, performed the data analysis, was involved in the interpretation of data, helped to prepare and revise the final document, and, as the corresponding author, oversaw the contributions of all of the authors. DJR assisted with the data analysis and interpretation of the data, helped to prepare and revise the document, and was responsible for overseeing the revisions of the final document. All of the authors agree that they are accountable for the accuracy and integrity of all parts of the project.
Funding JMG was supported by the Cardiovascular Epidemiology Training Grant T32HL098048 in Behavior, the Environment, and Global Health from the National Heart, Lung, and Blood Institute, National Institutes of Health. The other authors received no specific grant from any funding agency in public, commercial, or not-for-profit sectors.
Competing interests None declared.
Ethics approval The study received ethics approval by University of Virginia Institutional Review Board.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement Ownership of the data from the project will be shared between the three authors. Storage and security of the data will be the responsibility of the corresponding author, JMG, and the data will be housed on a dedicated hard drive using password-protected program. Any requests for access to the data will be reviewed by all three authors and the release of any portion of the data must be agreed on by all three of the authors.
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