Document Detail

Impact of Orthoses on Changes in Neuromuscular Control and Aerobic Cost of a 1-H Run.
MedLine Citation:
PMID:  21552159     Owner:  NLM     Status:  Publisher    
PURPOSE:: To determine the effect of foot orthoses on neuromuscular control and the aerobic cost of running. METHODS:: Twelve recreational athletes ran for 1 hour on a treadmill at a constant velocity (i.e. 10% higher than their first ventilatory threshold) with and without custom-molded foot orthoses, in a counterbalanced order. Surface electromyographic (EMG) activity of 5 lower limb muscles, together with oxygen consumption and heart rate were recorded at 8 min intervals, starting after 2 min, during the run. A series of neuromuscular tests including voluntary and electrically evoked contractions of the ankle plantar-flexors were performed before and after running. RESULTS:: Peroneus longus root mean square (RMS) amplitude decreased with time, independently of the condition (-18.9%; P<0.01). Lower RMS signal amplitude for vastus medialis (-13.3% P<0.02,) and gastrocnemius medialis (-10.7%, P<0.05), combined with increased peroneus longus burst duration (+14.7%; P<0.05) occurred when running with orthoses. There was no main effect of the condition for oxygen consumption (P>0.05), while heart rate was significantly lowered while wearing foot orthoses (-3%; P<0.02). Maximal strength capacity (-9%; P < 0.01), normalized EMG activity (-17%; P < 0.001) and peak twitch torque (-14%; P < 0.01) declined from pre- to post-exercise, independently of the condition. Smaller fatigue-induced decrements in the rate of torque development within the first 200 ms (-6% vs. -33%; P<0.01) were reported after running with foot orthoses. CONCLUSIONS:: Wearing foot orthoses alters neuromuscular control during the course of a sub-maximal, 1-h treadmill run and partly protects from the resulting fatigue-induced reductions in rapid force development characteristics of the plantar flexors. However, these changes may be too small to alter the aerobic cost of running.
Luke A Kelly; Olivier Girard; Sebastien Racinais
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-5-4
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-5-9     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:  -    
ASPETAR - Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.
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