NASA NTRS · 19920000619
Contraction-Only Exercise Machine
Abstract
Standard knee-extension machine modified so subject experiences force only when lifting leg against stack of weights. Exerts little force on leg while being lowered. Hydraulic cylinder and reservoir mounted on frame of exercise machine. Fluid flows freely from cylinder to reservoir during contraction (lifting) but in constricted fashion from reservoir to cylinder during extension (lowering).
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Doerr, Donald F., Maples, Arthur B., Campbell, Craig M.. 1992-10-01. Contraction-Only Exercise Machine. https://ntrs.nasa.gov/citations/19920000619
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