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Exercise training increases basal nitric oxide production from the forearm in hypercholesterolemic patients
T V Lewis1, A M Dart, J P Chin-Dusting
1Alfred and Baker Medical Unit, Baker Medical Research Institute, Prahran, Australia.
Arteriosclerosis, Thrombosis, and Vascular Biology
|November 13, 1999
Summary
Cycle training boosts nitric oxide (NO) production in hypercholesterolemic patients, improving cardiovascular health. This exercise intervention enhances NO release, contributing to reduced blood pressure.
Area of Science:
- Cardiovascular Physiology
- Exercise Science
- Endocrinology
Background:
- Hypercholesterolemia impairs endothelium-dependent vasodilation and nitric oxide (NO) production.
- Exercise training is known to improve cardiovascular function, but its effects on basal NO production in this population are not fully understood.
Purpose of the Study:
- To investigate the impact of cycle training on basal nitric oxide (NO) production and endothelium-dependent dilator capacity in hypercholesterolemic patients.
- To determine if exercise training can improve impaired acetylcholine responsiveness in this cohort.
Main Methods:
- Nine sedentary hypercholesterolemic volunteers underwent a randomized crossover design of 4 weeks sedentary followed by 4 weeks of home-based cycle training (3x/week).
- Measurements included maximal oxygen consumption (VO2max), forearm blood flow responses to acetylcholine, sodium nitroprusside, and N(G)mono methyl L-arginine, and arteriovenous nitrate/nitrite (NOx) gradient.
- Blood pressure, plasma triglycerides, and lipid profiles were also assessed.
Main Results:
- Cycle training significantly increased VO2max and reduced diastolic blood pressure.
- A significant shift from net NO extraction to net NO production was observed in the forearm after training (P=0.03).
- N(G)mono methyl L-arginine induced greater vasoconstriction post-training (P=0.05), suggesting increased basal NO release.
Conclusions:
- Four weeks of home-based cycle training enhances basal nitric oxide (NO) release in hypercholesterolemic patients.
- This improvement in NO production occurs independently of changes in the lipid profile.
- Increased NO availability may contribute to the cardiovascular protective effects of exercise training, including blood pressure reduction.