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|Title: ||The need for muscle co-contraction prior to a landing|
|Authors: ||Yeadon, Maurice R.|
King, Mark A.
Forrester, Stephanie E.
Pain, Matthew T.G.
|Keywords: ||Computer simulation|
Ground reaction forces
|Issue Date: ||2010|
|Publisher: ||© Elsevier|
|Citation: ||YEADON, M.R. ... et al, 2010. The need for muscle co-contraction prior to a landing. Journal of Biomechanics, 43 (2) pp. 364-369.|
|Abstract: ||In landings from a flight phase the mass centre of an athlete experiences rapid decelerations. This study
investigated the extent to which co-contraction is beneficial or necessary in drop landings, using both
experimental data and computer simulations. High speed video and force recordings were made of an elite
martial artist performing drop landings onto a force plate from heights of 1.2 m, 1.5 m and 1.8 m. Matching
simulations of these landings were produced using a planar 8-segment torque-driven subject-specific
computer simulation model. It was found that there was substantial co-activation of joint flexor and extensor
torques at touchdown in all three landings. Optimisations were carried out to determine whether landings
could be effected without any co-contraction at touchdown. The model was not capable of landing from
higher than 1.05 m with no initial flexor or extensor activations. Due to the force-velocity properties of
muscle, co-contraction with net zero joint torque at touchdown leads to increased extensor torque and
decreased flexor torque as joint flexion velocity increases. The same considerations apply in any activity
where rapid changes in net joint torque are required, as for example in jumps from a running approach.|
|Description: ||This article was accepted for publication in the Journal of Biomechanics [© Elsevier] and the definitive version is available at: www.elsevier.com/locate/jbiomech|
|Version: ||Accepted for publication|
|Appears in Collections:||Published Articles (Sport, Exercise and Health Sciences)|
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