Journal
APPLIED PHYSIOLOGY NUTRITION AND METABOLISM
Volume 34, Issue 5, Pages 851-857Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/H09-074
Keywords
ratings of perceived exertion scale of Borg; type 2 diabetes mellitus; overweight; obesity; physical activity; exercise
Categories
Funding
- General Internal Medicine Division of the University of Colorado Denver (UCD) School of Medicine
- American Diabetes Association
- Health Resources and Services Administration faculty development grant
- UCD Center for Women's Health Research Junior Faculty Research Development Award
- Armstrong Family Foundation grant
- National Research Service Award [F32 DK088413-01]
- American Diabetes Association award
- Veteran Affairs Merit award
- National Institutes of Health [DK064741]
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Regular exercise is a cornerstone of diabetes treatment; however, people with type 2 diabetes (T2D) are commonly sedentary. It is possible that a harder rate of perceived exertion (RPE) during exercise for those with T2D as compared with nondiabetics may be a barrier to physical activity. This study examined RPE (Borg scale, ordinal range 6-20) during submaximal exercise at identical absolute work rates to test the hypothesis that women with T2D demonstrate harder RPE during exercise than nondiabetic controls. In a prespecified analysis of existing data from equivalently sedentary women, RPE during submaximal exercise was compared among women with uncomplicated T2D (n = 13, mean body mass index (BMI) 34.2, mean hemoglobin A1c 9%), overweight controls (OC, n = 13, mean BMI 30.7), and normal-weight controls (NWC, n = 13, mean BMI 23.1). Subjects performed three 7 min, constant-load exercise tests at 20 W and 30 W. Mixed-effects general linear modeling was used to test for differences in mean RPE estimates among groups with and without adjustment for relative work intensity, age, habitual physical activity, or BMI. Subjects with T2D perceived harder effort during bicycling exercise than controls, as measured by RPE at 20 W and 30 W (p < 0.05 for T2D vs. OC and for T2D vs. NWC). Adjusting for relative work intensity eliminated significant group RPE differences at 30 W, but group RPE differences at 20 W remained significant. Harder perceived effort during exercise may be a barrier to physical activity for those with T2D.
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