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Abstract. The activity of certain muscles that cross the elbow joint complex (EJC) are aected by forearm
 

Summary: Abstract. The activity of certain muscles that cross the
elbow joint complex (EJC) are aected by forearm
position and forearm movement during elbow ¯exion/
extension. To investigate whether these changes are based
on the musculoskeletal geometry of the joint, a three-
dimensional musculotendinoskeletal computer model of
the EJC was used to estimate individual muscle activity in
multi-degree-of-freedom (df) rapid (ballistic) elbow
movements. It is hypothesized that this model could
reproduce the major features of elbow muscle activity
during multi-df elbow movements using dynamic optimal
control theory, given a minimum-time performance
criterion. Results from the model are presented and
veri®ed with experimental kinematic and electromyo-
graphic data from movements that involved both one-df
elbow ¯exion/extension and two-df¯exion/extension with
forearm pronation/supination. The model demonstrated
how the activity of particular muscles is aected by both
forearm position and movement, as measured in these
experiments and as previously reported by others. These

  

Source: Abraham, Lawrence D. - Institute for Neuroscience & Department of Kinesiology and Health Education, University of Texas at Austin

 

Collections: Biology and Medicine