clinical trial
Cardiac Output Adaptation in Long-Duration Lunar Residents: Echocardiographic Findings at 6, 12, and 24 Months
Dr. Michael Oduya
· Armstrong Settlement Health Services
Lunar Cardiology · Vol. 2, No. 3 · April 10, 2029
Abstract
Serial echocardiography in 83 lunar residents demonstrates progressive left ventricular mass reduction and decreased stroke volume over 24 months in 1/6g. Findings are consistent with reduced preload demand and have implications for exercise prescription and cardiovascular medication dosing.
Cardiac deconditioning in microgravity is well documented. The lunar partial-gravity environment attenuates but does not eliminate these changes. We enrolled 83 adult lunar residents aged 24–58 at Copernicus Station and performed echocardiography at baseline and 6-month intervals.
Key findings: LV mass decreased by a mean of 6.4% at 12 months and 9.1% at 24 months. Stroke volume decreased proportionally. Resting cardiac output was maintained through compensatory heart rate increase. Exercise capacity declined in parallel with LV mass.
Cardiovascular medication dosing in lunar residents requires adjustment: beta-blockers reduce a heart rate that is already compensating for reduced stroke volume. We recommend conservative dose reductions of 20–30% for rate-limiting agents.
These findings reinforce the importance of the daily resistance exercise protocol and suggest that two-year assignments may represent the outer limit of uncomplicated cardiovascular health without pharmacological countermeasures.
Key findings: LV mass decreased by a mean of 6.4% at 12 months and 9.1% at 24 months. Stroke volume decreased proportionally. Resting cardiac output was maintained through compensatory heart rate increase. Exercise capacity declined in parallel with LV mass.
Cardiovascular medication dosing in lunar residents requires adjustment: beta-blockers reduce a heart rate that is already compensating for reduced stroke volume. We recommend conservative dose reductions of 20–30% for rate-limiting agents.
These findings reinforce the importance of the daily resistance exercise protocol and suggest that two-year assignments may represent the outer limit of uncomplicated cardiovascular health without pharmacological countermeasures.
Keywords
cardiac, echocardiography, LV mass, deconditioning, stroke volume, lunar