Document Detail


Mechanisms for improved running economy in beginner runners.
MedLine Citation:
PMID:  22525760     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Controversy surrounds whether running mechanics make good predictors of running economy (RE) with little known about the development of an economical running gait. PURPOSE:: The aim of this study was to identify if mechanical or physiological variables changed over 10 weeks of running in beginners and whether these changes could account for any change in RE. METHODS:: A 10 week running programme (10wkRP) was completed by 10 female beginner runners. A bilateral three-dimensional kinematic and kinetic analysis, in addition to RE and lower-body flexibility measurements were performed before and after the 10wkRP. The Balke-Ware graded walking exercise test was performed pre- and post- 10wkRP to determine V˙O2max. RESULTS:: Seven kinematic and kinetic variables significantly changed from pre- to post- training, in addition to a significant decrease in calf flexibility (27.3 ± 6.3 v 23.9 ± 5.6°, p < 0.05). A significant improvement was seen in RE (224 ± 24 v 205 ± 27 ml·kg·km, p < 0.05) and treadmill time-to-exhaustion (16.4 ± 3.2 v 17.3 ± 2.8 mins, p < 0.05); however V˙O2max remained unchanged from pre- to post- training (34.7 ± 5.1 v 34.3 ± 5.6 ml·kg·min). Stepwise regression analysis showed three kinematic variables to explain 94.3% of the variance in change in RE. They were a less extended knee at toe-off (TO) (p = 0.004), peak dorsiflexion occurring later in stance (p = 0.001), and a slower eversion velocity at touch-down (TD) (p = 0.042). The magnitude of change for each variable was 1.5, 4.7 and 34.1% respectively. CONCLUSION:: These results show that beginner runners naturally developed their running gait as they became more economical runners.
Authors:
Isabel Sarah Moore; Andrew M Jones; Sharon Dixon
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-19
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Bioenergetics and Human Performance Research Group, Sport and Health Sciences, University of Exeter, Exeter, EX1 2LU.
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