Abstract
Purpose
Exercise training in healthy volunteers rapidly improves vascular function, preceding structural remodelling. No study examined the time-course of such adaptations in subjects with a priori endothelial dysfunction.
Methods
We examined brachial artery endothelial and smooth muscle function using flow-mediated dilation (FMD) and glyceryl trinitrate (GTN) administration in 13 type 2 diabetes patients (59 ± 6 years) and 10 healthy subjects (58 ± 7 years) before, during (2-weekly) and after an 8-week training programme. Arterial structure was assessed via peak blood flow and artery diameter.
Results
Training increased peak oxygen uptake (P = 0.03), comparable between groups (P = 0.276). We observed a similar impact of training on brachial artery vasomotor function across the training period in diabetes patients and controls (FMD/GTN-ratio), with a higher FMD/GTN-ratio at 2, 6 and 8 weeks (P = 0.036). Artery diameter, peak blood flow or peak diameter had not changed after training.
Conclusion
Training leads to rapid improvement in brachial artery vascular function in diabetes patients and controls. In contrast to previous observations in healthy young subjects, the increase in function was preserved after 8 weeks of training in middle-aged diabetes patients and controls, suggesting a different time-course in vascular adaptations in subjects with endothelial dysfunction.
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Abbreviations
- ANOVA:
-
Analysis of variance
- BMI:
-
Body mass index
- bpm:
-
Beats per minute
- eNOS:
-
Endothelial nitric oxide synthase
- FMD:
-
Flow-mediated dilation
- GTN:
-
Glyceryl trinitrate
- HDL:
-
High-density lipoprotein
- HOMA-IR:
-
Homeostasis model assessment for insulin resistance
- HR:
-
Heart rate
- LDL:
-
Low-density lipoprotein
- LSD:
-
Least significant differences
- NO:
-
Nitric oxide
- rpm:
-
Rotations per minute
- RQ:
-
Respiratory quotient
- T2DM:
-
Type 2 diabetes mellitus
- W:
-
Watt
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Acknowledgments
DHJT is financially supported by the Dutch Heart Foundation (E Dekker stipend, 2009T064) and Actelion BV (2009-46 Actelion Endothelin Research Award). DJG is supported by the National Heart Foundation of Australia.
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Communicated by Fabio Fischetti.
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Schreuder, T.H.A., Green, D.J., Nyakayiru, J. et al. Time-course of vascular adaptations during 8 weeks of exercise training in subjects with type 2 diabetes and middle-aged controls. Eur J Appl Physiol 115, 187–196 (2015). https://doi.org/10.1007/s00421-014-3006-7
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DOI: https://doi.org/10.1007/s00421-014-3006-7