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| Research article summary (published 30 Mar 2003): |
Decreasing landing forces in children: the effect of instructions.
Full Abstract
STUDY
DESIGN:
Randomized controlled experimental design.
OBJECTIVES:
To examine the effects of verbal instructions related to control of joint kinematics and auditory feedback on lowering the vertical peak ground reaction forces associated with landing from a jump in children.
BACKGROUND:
The majority of children's injuries are associated with activities that involve jumping and landing. Instructions related to joint motion may assist children in decreasing landing forces and thus reduce the chances of sustaining an injury.
METHODS AND MEASURES:
Sixty-one school children whose mean (+/- SD) age was 9 (+/- 0.89) years participated. The children were randomly assigned (by school) to either experimental (received instruction on lower limb position and auditory cues) or control (received no instruction) groups. Participants were required to step off a box 300 mm in height and land on a force plate. The testing procedure involved 5 sessions. The first 4 sessions were performed over 3 days in the same week, while session 5 was performed approximately 3 months later to assess retention of the skill. The main outcome measure was the peak vertical ground reaction force recorded at foot strike.
RESULTS:
After instructions, subjects in the experimental group produced lower peak ground reaction forces (P<0.05) during landing compared to their control counterparts (ie, sessions 2-4). There was no significant difference (P<0.05) between groups at session 5 (3 months postinstruction).
CONCLUSIONS:
Children are capable of assimilating precise instruction to minimize forces on the lower limbs during landing from a jump. Providing further opportunity (ie, more than 1 session) to perform the skill does not alter the magnitude of the effect observed after the initial session of instruction. However, the improvements in landing performance were temporary.
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Author information
Author/s: Prapavessis, Harry (H); McNair, Peter J (PJ); Anderson, Kirsten (K); Hohepa, Maea (M);
Affiliation: Department of Sport and Exercise Science, University of Auckland, Auckland, New Zealand.
Journal and publication information
Publication Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial
Journal: The Journal of orthopaedic and sports physical therapy (J Orthop Sports Phys Ther), published in United States. (Language: eng)
Reference: 2003-Apr; vol 33 (issue 4) : pp 204-7
Dates: Created 2003/05/01; Completed 2003/08/20; Revised 2006/11/15;
PMID: 12723677, 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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