Document Detail


Effects of an Individualized Soccer Match Simulation on Vertical Stiffness and Impedance.
MedLine Citation:
PMID:  21997450     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE:: An observed relationship between soccer match duration and injury has led to research examining changes in lower extremity mechanics and performance with fatiguing exercise. As many fatigue protocols are designed to result in substantial muscular deficits, theymay not reflectthe fatigue associated with sport-specificdemandsthat have been associated with therising incidence of injury as the match progresses. Thus, the aim of this study was to systematically analyze progressive changes in lower extremity mechanics and performance during an individualized exercise protocol designed to simulate a 90-minute soccer match. METHODS:: Previous match analyses data were utilized to systematically develop a simulated soccer match exercise protocol that was individualized to the participant's fitness level. Twenty-four NCAA Division I soccer players (12 males,12 females) participated in two testing sessions. In the first session, participants completed the Yo-Yo Intermittent Recovery Test Level 1 (YYIR1) to assess their fitness level and determine the five sub-maximal running intensities for their soccer match simulation. In the second test session, progressive changes in RPE, lower extremity performance (vertical jump height, sprint speed, and cutting speed), and movement mechanics (jumping vertical stiffness and terminal landing impedance)were measured during the soccer match simulation. RESULTS:: The average match simulation running distance was 10,165±1,001 meters, consistent with soccer match analyses research. Time-related increases in RPE, and decrements in sprinting, and cutting speed were observed, suggesting that fatigue increased as the simulation progressed. However, there were no time-related decreases in vertical jump height, changes in lower extremity vertical stiffness in jumping, or verticalimpedance during in landing. Secondary analyses indicated that the coordinative changes responsible for the maintenance of stiffness and impedance differed between the dominant and non-dominant limbs. CONCLUSION:: Despite an increase in RPE to near exhaustive levels, and decrements in sprint and cutting performance, participants were able to maintain jump performance and movement mechanics.Interestingly, the coordinative changes that allowed for the maintenance of vertical stiffness and impedance varied between limbs. Thus, suggesting that unilateral training for performance and injury prevention in soccer specific populations should be considered.
Authors:
John R Cone; Nathaniel T Berry; Allan Goldfarb; Robert Henson; Randy Schmitz; Laurie Wideman; Sandra J Shultz
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-12
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1 The University of North Carolina at Greensboro, Department of Kinesiology; 2 The University of North Carolina at Chapel Hill, Department of Exercise & Sport Science.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Kettlebell swing, snatch and bottoms-up carry: Back and hip muscle activation, motion, and low back ...
Next Document:  Improving General Flexibility with a Mindbody Approach: A Randomized, Controlled Trial using Neuro E...