Muscle activity and movement

“We expected to see a one-to-one correlation between the muscle activity and movements because motion is generally driven by muscles,” Higham said, “but as we changed the structure of their habitat and they changed their motions, we were surprised to find very few accompanying changes in muscle activity.”

Context-dependent changes in motor control and kinematics during locomotion: modulation and decoupling. Foster and Higham
http://www.ncbi.nlm.nih.gov/pubmed/24621949