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| Research article summary (published 29 Nov 2002): |
Effect of frequency on human unipedal hopping.
Full Abstract
All mature forms of locomotion involve periods of unilateral stance. Unipedal hopping may provide useful information about the neuromuscular and biomechanical capabilities of a single lower extremity in adults. This study investigated whether hopping influenced vertical stiffness and lower extremity angular kinematics during human unipedal hopping. Vertical force and two-dimensional kinematics were measured in 10 healthy males hopping at three frequencies:
preferred, +20%, and -20%. At +20%, compared to preferred, vertical stiffness increased 55% as hip flexion, knee flexion, and ankle dorsiflexion decreased, while at -20% vertical stiffness decreased 39.4% as hip flexion, knee flexion, and ankle dorsiflexion increased. As in bipedal hopping, the force-displacement relationship was more springlike at the preferred rate and +20% than at -20%. Given the prevalence of unilateral stance during walking, running, and skipping, findings related to unipedal hopping may be useful in the rehabilitation or conditioning of lower extremities.
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Author information
Author/s: Austin, Gary P (GP); Tiberio, David (D); Garrett, Gladys E (GE);
Affiliation: Department of Physical Therapy and Human Movement Science, Sacred Heart University, Fairfield, CT 06432, USA. austing(-atsign-)sacredheart.edu
Journal and publication information
Publication Type: Journal Article
Journal: Perceptual and motor skills (Percept Mot Skills), published in United States. (Language: eng)
Reference: 2002-Dec; vol 95 (issue 3 Pt 1) : pp 733-40
Dates: Created 2003/01/01; Completed 2003/04/07; Revised 2006/11/15;
PMID: 12509167, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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