Extracting low-velocity concentric and eccentric dynamic muscle properties from isometric contraction experiments

摘要: Abstract Determining dynamic properties of mammalian muscles, such as activation characteristics or the force–velocity relation, challenges experimentalist. Tracking system, apparatus stiffness, load oscillation, force transducer, other sensors, and additional measuring devices may be incorporated, integrated evaluated in an experimental set-up. In contrast, isometric contraction experiments (ICEs) are less challenging, but generally not considered to reveal muscle properties. Yet, a sensitivity analysis our model discloses influence concentric, eccentric parameters on development. Accordingly, we used solely ICE data identify that describe concentric well performance. addition, compared two different dynamics regards their physiological relevance improve model-fits data. To this end, optimized combinations parameter subsets with respect solutions. Depending length model, contractile element reached shortening peaks during range 9–39% its maximum velocity, about 8–25% lengthening when deactivated. As first result, suggest one formulation superior. Second, step slope force-velocity relation at was found least influential among all parameters. Third, specially designed set-up estimate transition parameter. Fourth, because inconsistency literature, developed simple method determine switching times neural stimulation thus electro-mechanical delay (EMD) values from ICEs only.