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Effects of Aerobic Exercise vs. Resistance Training on Endothelial Function in Women with Type 2 Diabetes Mellitus
Hwi Ryun Kwon, Kyung Wan Min, Hee Jung Ahn, Hee Geum Seok, Jae Hyuk Lee, Gang Seo Park, Kyung Ah Han
Diabetes Metab J. 2011;35(4):364-373.   Published online August 31, 2011
DOI: https://doi.org/10.4093/dmj.2011.35.4.364
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AbstractAbstract PDFPubReader   
Background

There is controversy over whether aerobic or resistance exercise is more effective for improving endothelial function in type 2 diabetes mellitus (T2DM). This study was aimed to investigate the effects of an aerobic and resistance training program on endothelial function, and the influences of glycemic control, body weight changes, and aerobic capacity in T2DM.

Methods

Total 40 overweight women with T2DM were assigned into 3 groups: an aerobic exercise group (AEG, n=13), resistance exercise group (REG, n=12), and control group (CG, n=15), and followed either brisk walking for the AEG or resistance band training for the REG, 60 minutes per day, 5 days per week for 12 weeks with monitoring daily activity using accelerometers. We assessed endothelial function by flow-mediated dilation (FMD), and aerobic capacity by oxygen uptake at anaerobic threshold (AT_VO2) at baseline and following training program.

Results

The mean participants' age was 57.0±6.8 years, and body mass index (BMI) was 27.0±2.3 kg/m2. After intervention, FMD increased by 2.2±1.9% in AEG, which differed from REG and CG (P=0.002), despite of decreased body weight (BW) in both AG and RG (2.8±2.5%, P=0.002; 1.6±2.0%, P=0.017, respectively). A significant increased AT_VO2 and decreased HbA1c were found only in AEG. In all participants, FMD was changed with the significant relations to the AT_VO2 (r=0.348, P=0.035), but not to HbA1c levels or BW.

Conclusion

Aerobic exercise appears to be more beneficial than resistance exercise for improving endothelial function in T2DM. In addition, aerobic capacity could be a better predictor of changes in FMD than BW and glycemic control.

Citations

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Association Between Impaired Vascular Endothelial Function and High Sensitivity C-reactive Protein, a Chronic Inflammatory Marker, in Patients with Type 2 Diabetes Mellitus.
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AbstractAbstract PDF
BACKGOUND: Eighty percents of diabetes-related mortalities are due to atherosclerotic vascular complications. The accelerated atherosclerosis in type 2 diabetic patients is partly due to the increased incidences of cardiovascular risk factors, such as hypertension, obesity, dyslipidemia, insulin resistance and oxidative stress. Endothelial dysfunction is known as an early marker of cardiovascular disease and a predictor of cardiovascular events. The flow mediated dilation (FMD) of the brachial artery has been documented as being reduced in type 2 diabetic patients. Inflammatory markers, such as C-reactive protein(CRP) and interleukin-6(IL-6), are associated with the risk of cardiovascular disease. Endothelial dysfunction has a direct correlation with the levels of CRP, which are elevated in patients with diabetes compared with non-diabetic subjects. In this study, the FMD in diabetic and non-diabetic subjects were compared, and the association of cardiovascular risk factors and endothelial function examined in type 2 diabetic patients. METHODS: 57 consecutive diabetic subjects and 29 non-diabetic subjects, aged 35 to 69(54.0+/-1.0 years), without proven macrovascular complications, were enrolled in this study. Cardiovascular risk factors, such as body weight, height, waist and hip circumference, fasting plasma glucose and insulin levels, lipid profiles, inflammatory and coagulation markers were measured. The FMD of the brachial artery and the intima-media thickness(IMT) of the carotid artery were determined using high-resolution B-mode ultrasound. RESULTS: The FMD values were significantly lower in the diabetic compared with the non-diabetic subjects(7.6+/-0.2% vs. 8.9+/-0.4%, P=0.004). The homocysteine levels were significantly higher in the diabetic than non-diabetic subjects(12.4+/-0.4micromol/L vs. 9.5+/-0.6micromol/L, P<0.0001). In diabetic subjects, the FMD was shown to be significantly negatively correlated with high sensitivity C-reactive protein(hsCRP)(P=0.006), fibrinogen(P=0.024) and homocysteine (P=0.038). A multiple regression analysis, after adjusted for age, sex, body mass index(BMI), hypertension, and smoking, showed that hsCRP(beta=-0.424, P=0.002) and fibrinogen(beta=-0.324, P=0.025) had significant inverse association with the FMD in diabetic subjects. CONCLUSION: Diabetic subjects have an impaired endothelial function compared with the non-diabetic subjects, and the vascular endothelial function has a significant negative correlation with hsCRP and fibrinogen. These findings suggest that hsCRP might be an independent predictor of endothelial dysfunction and atherosclerosis, and chronic inflammation might play a pivotal role in the impairment of the endothelial function in diabetic patients.

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