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Department of Biomedical Engineering, Cleveland Clinic Foundation, Cleveland, Ohio 44195-5254
Enoka, Roger M. Eccentric contractions require unique
activation strategies by the nervous system. J. Appl.
Physiol. 81(6): 2339-2346, 1996.
Eccentric
contractions occur when activated muscles are forcibly lengthened. This
mode of muscle function occurs frequently in the activities of daily
living and in athletic competition. This review examines the
experimental evidence that provides the foundation for our current
understanding of the benefits, consequences, and control of eccentric
contractions. Over the past several decades, numerous studies have
established that eccentric contractions can maximize the force exerted
and the work performed by muscle; that they are associated with a
greater mechanical efficiency; that they can attenuate the mechanical
effects of impact forces; and that they enhance the tissue damage
associated with exercise. More recent evidence adds a new feature to
this repertoire by suggesting a new hypothesis: that the neural
commands controlling eccentric contractions are unique. Examination of this hypothesis is critical because the existence of such a control scheme would increase substantially the complexity of the strategies that the nervous system must use to control movement.
muscle work; exercise; movement control
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