Document Detail

Dorsiflexion Capacity Affects Achilles Tendon Loading during Drop Landings.
MedLine Citation:
PMID:  20689446     Owner:  NLM     Status:  In-Data-Review    
PURPOSE: : Evidence suggests a link between decreased dorsiflexion range of motion (DROM) and injury risk during landings. The purpose of this study was to determine the effect of weight-bearing DROM on ankle mechanics during drop landings.
METHODS: : Forty-eight men (mean ± SD = 22.5 ± 4.7 yr) were measured for DROM. Participants performed drop landings onto a force platform at two vertical descent velocities (2.25 ± 0.15 and 3.21 ± 0.17 m·s), while EMG activity of four shank muscles and three-dimensional ankle joint kinematics were recorded. Participants were classified into low (37.7° ± 2.5°) and high (48.4° ± 2.5°) DROM groups.
RESULTS: : Ground reaction force, EMG, dorsiflexion angle, plantarflexion moment, and Achilles tendon force outcome variables were all equivalent for the two DROM groups during each landing condition. However, the low DROM group performed each landing condition at a significantly greater percentage of their DROM and displayed significantly more ankle eversion throughout most of the movement. The low and high DROM groups displayed DROM percentages of 27 ± 11 and 10 ± 11 (P = 0.013), 32 ± 9 and 23 ± 9 (P = 0.056), 60 ± 13 and 46 ± 13 (P = 0.004), and 66 ± 16 and 54 ± 9 (P = 0.003) when they encountered the peak plantarflexion moments, Achilles tendon force, eversion angles, and dorsiflexion angles, respectively.
CONCLUSION: : Participants with a low DROM absorbed the landing impact forces with their plantarflexor muscle-tendon units in a more lengthened and everted position. Athletes with a low DROM may be more likely to regularly overload their plantarflexor muscle-tendon units, thereby potentially exposing themselves to a higher likelihood of incurring injuries such as Achilles tendinopathy.
John W Whitting; Julie R Steele; Deirdre E McGhee; Bridget J Munro
Related Documents :
9596536 - Quantification of in vivo patellofemoral contact forces before and after acl transection.
16368626 - Effects of muscle-tendon length on joint moment and power during sprint starts.
1880136 - The effect of ankle constraint on the torsional laxity of the knee during internal-exte...
23802676 - Effects of chemical restraint on electroretinograms recorded sequentially in awake, sed...
20400646 - Sonation in the male common snipe (capella gallinago gallinago l.) is achieved by a fla...
21940436 - Glutamate spillover between mammalian cone photoreceptors.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  43     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-03-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  706-13     Citation Subset:  IM; S    
Biomechanics Research Laboratory, School of Health Sciences, University of Wollongong, Wollongong, AUSTRALIA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  Functional heterogeneity of osteopontin isoforms in non-small cell lung cancer.
Next Document:  Associations among Strength, Steadiness, and Hand Function across the Adult Life Span.