Clinical trial NCT05686967: MitoQ and Exercise Effects on Vascular Health
Official title: MitoQ Supplementation for Restoring Aerobic Exercise Training Effects on Endothelial Function in Postmenopausal Women
Conditions: Aging
Menopause
Summary: An impairment in vascular function can lead to the development of age-associated cardiovascular disease (CVD), the leading cause of death in postmenopausal women. Regular aerobic exercise (AE) benefits vascular function in older men by reducing oxidative stress, however, similar AE training improvements are diminished or absent in postmenopausal women. not using estrogen-based hormone therapy. Vascular function and oxidative stress are improved with AE training in postmenopausal women treated with E2, suggesting an essential role of E2 in vascular adaptations to AE in women. Clinical use of E2 is contraindicated for this purpose, thus establishing alternative pharmacological approaches that could be administered as a substitute for E2 to improve AE signaling for vascular benefits and reducing CVD risk in E2-deficient postmenopausal women is biomedically important. The mitochondrial-targeted antioxidant MitoQ may be an alternative to E2 for restoring AE benefits in E2-deficient postmenopausal women given its recently established effectiveness for reducing oxidative stress and improving vascular function in that population. Accordingly, the overall aim of this application is to assess the efficacy of a 12-week randomized controlled trial of moderate intensity AE training combined with oral MitoQ (20 mg/d) compared to AE+oral placebo (PL) or No AE+MitoQ on vascular vasodilatory function (brachial artery flow-mediated dilation; FMD) in healthy E2-deficient postmenopausal women. Insight into the causes for the improvement related to molecules (e.g., nitric oxide) that promote vasodilation, mitochondrial function, oxidative stress, and the influence of "circulating factors" will also be obtained. We hypothesize that AE+MitoQ will improve both FMD > AE+PL and > No AE+MitoQ, and that No AE+MitoQ will improve FMD > AE+PL. The greater improvements in endothelial function with AE+MitoQ vs. both AE+PL and No AE+MitoQ, and with No AE+MitoQ vs. AE+PL will be mediated by greater improvements in nitric oxide production, mitochondrial function, and mitochondrial and oxidative stress linked, at least in part, to changes in "circulating factors". The expected results from this study will establish the efficacy of MitoQ for restoring AE-vascular signaling in E2-deficient postmenopausal women and will provide the foundation for development of evidence-based guidelines for sex-specific AE programs for improving vascular health and preventing CVD in postmenopausal women.
Interventions:
description: MitoQ is a biochemically modified form of ubiquinol
name: MitoQ
other_name: Mitoquinol
type: Dietary Supplement
description: Each placebo capsule contains inert excipient and is identical in appearance
name: Placebo
type: Dietary Supplement
description: Moderate intensity aerobic exercise on the treadmill
name: Aerobic exercise
type: Behavioral
Study arms:
design_group_description: Moderate intensity aerobic exercise, 50 minutes of treadmill exercise, 65-75% of maximal heart rate, 3 d/week for 10 weeks plus experimental MitoQ, 20mg/d.<br/>Each MitoQ capsule contains 20 mg of mitoquinol mesylate. Dosage: 20 mg orally per day for 10 weeks.
design_group_title: Aerobic Exercise plus MitoQ
design_group_type: Experimental
design_group_description: Moderate intensity aerobic exercise, 50 minutes of treadmill exercise, 65-75% of maximal heart rate, 3 d/week for 10 weeks plus matching placebo capsule/d for 10 weeks.<br/>Matched placebo capsules.
design_group_title: Aerobic Exercise plus Placebo
design_group_type: Placebo Comparator
design_group_description: No exercise plus experimental MitoQ, 20mg/d. Each MitoQ capsule contains 20 mg of mitoquinol mesylate. Dosage: 20 mg orally per day for 10 weeks.
design_group_title: No Exercise plus MitoQ
design_group_type: Experimental
Sponsor: University of Colorado Denver
Collaborators: National Institute on Aging
Drug name mappings:
name: Mitoquinone mesylate
lang: EN