Effect of orthoses on changes in neuromuscular control and aerobic cost of a 1-h Run

Kelly, Luke A., Girard, Olivier and Racinais, Sebastien (2011) Effect of orthoses on changes in neuromuscular control and aerobic cost of a 1-h Run. Medicine and Science in Sports and Exercise, 43 12: 2335-2343. doi:10.1249/MSS.0b013e31822037ca

Author Kelly, Luke A.
Girard, Olivier
Racinais, Sebastien
Title Effect of orthoses on changes in neuromuscular control and aerobic cost of a 1-h Run
Journal name Medicine and Science in Sports and Exercise   Check publisher's open access policy
ISSN 0195-9131
Publication date 2011
Year available 2011
Sub-type Article (original research)
DOI 10.1249/MSS.0b013e31822037ca
Open Access Status
Volume 43
Issue 12
Start page 2335
End page 2343
Total pages 9
Place of publication Philadelphia, PA United States
Publisher Lippincott Williams and Wilkins
Collection year 2012
Language eng
Subject 2732 Orthopedics and Sports Medicine
3612 Physical Therapy, Sports Therapy and Rehabilitation
Abstract Purpose: The study's purpose was to determine the effect of foot orthoses on neuromuscular control and the aerobic cost of running. Methods: Twelve recreational athletes ran for 1 h 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 EMG activity of five lower limb muscles, together with oxygen consumption and HR, was 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 was performed before and after running. Results: Peroneus longus root mean square amplitude decreased with time, independently of the condition (-18.9%, P < 0.01). Lower root mean square 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), whereas HR 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 before to after 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 a submaximal 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.
Keyword Cost of locomotion
Foot orthoses
Muscle activity
Neuromuscular Fatigue
Treadmill running
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Human Movement and Nutrition Sciences Publications
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