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Oxygen transport and peripheral microcirculation in long-term diabetes
J L Young1, D R Pendergast, J Steinbach
1Department of Physiology, State University of New York, Buffalo School of Medicine.
Summary
Long-term diabetes significantly impairs muscle blood flow and oxygen transport during exercise, even without diagnosed vascular disease. This reduced delivery limits exercise tolerance in diabetic individuals.
Area of Science:
- Physiology
- Exercise Science
- Diabetology
Background:
- Long-term diabetes can affect microvascular function.
- Peripheral vascular disease is a known complication, but subclinical effects on muscle blood flow are less understood.
Purpose of the Study:
- To evaluate the impact of long-term diabetes on muscle blood flow (MBF) and oxygen transport (VO2) during exercise.
- To investigate if impaired microvascular function occurs in diabetics without clinically diagnosed peripheral vascular disease.
Main Methods:
- Study included 12 male patients with long-term insulin-controlled diabetes and 7 age-matched controls.
- Muscle blood flow (MBF) in vastus lateralis and tibialis anterior was measured using 133Xe clearance.
- Oxygen consumption (VO2) was determined via breath-by-breath analysis during cycle ergometer exercise.
Main Results:
- Diabetic group showed significantly lower exercise MBF in both vastus lateralis and tibialis anterior compared to controls.
- Steady-state VO2 during exercise was lower in diabetics, alongside greater blood lactate accumulation.
- Similar trends were observed in supine exercise, with elevated blood pressure in diabetics.
Conclusions:
- Impaired microvascular flow in long-term diabetics, even without overt peripheral vascular disease, reduces oxygen delivery.
- This reduction in muscle blood flow leads to decreased exercise tolerance in diabetic individuals.