Document Detail

A task failure has no effect on the electromechanical delay of the peroneus longus.
MedLine Citation:
PMID:  19400406     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Ankle inversion injuries represent the most common trauma sustained by athletes. Muscle fatigue from activity may contribute to a delay in the response of the ankle proprioceptors and dynamic restraints during unexpected inversion. The purpose of this investigation was to determine if the electromechanical delay (EMD) of the peroneus longus is influenced by a task failure exercise. SUBJECTS: Sixteen subjects (age 20 +/- 1.1 y; mass 71.6 +/- 12.5 kg; height 173.0 +/- 8.7 cm; 9 male, 1 female) with no lower extremity injuries reported for data collection. MEASUREMENTS: Data were collected from each subject's dominant leg using surface electromyography (EMG). Electrodes were applied over the peroneus longus (PL) using a standard protocol. A stimulating electrode was applied to the common peroneal nerve. Subjects were placed in a monopedal stance on a force platform. A low amplitude, short duration stimulus was applied to the common peroneal nerve. The EMG was used to determine timing of the M wave and the force platform was used to determine the onset of foot pronation. Once 6 trials were recorded, subjects completed 2 sets of an isotonic activity that isolated the peroneals. The task was completed to failure for each set. Immediately following the task failure exercise, subjects returned to the force platform for 6 additional trials recorded as before. Analysis of data was performed by determining the onset of the M wave as the beginning of positive EMG activity following the end of the imposed stimulus response. This point was superimposed on the force platform curve and the point at which a 10 N.m force change occurred was used to calculate the EMD (time difference between the force platform indicator and the M wave indicator). RESULTS: Average EMD prior to the task failure exercise was 13.35 +/- 3.47 ms. Following the task failure exercise, the average EMD was 12.67 +/- 3.86 ms. A paired samples t test revealed no significant differences with regard to EMD between pre- and post-task failure exercise for the PL (p = 0.448). CONCLUSION: We concluded that the task failure exercise did not affect the electromechanical delay of the PL.
T A McLoda; J M Stanek; A J Hansen; S T McCaw
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Electromyography and clinical neurophysiology     Volume:  49     ISSN:  0301-150X     ISO Abbreviation:  Electromyogr Clin Neurophysiol     Publication Date:    2009 Mar-Apr
Date Detail:
Created Date:  2009-04-29     Completed Date:  2009-06-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0327533     Medline TA:  Electromyogr Clin Neurophysiol     Country:  Belgium    
Other Details:
Languages:  eng     Pagination:  109-15     Citation Subset:  IM    
School of Kinesiology and Recreation, Illinois State University, Normal, Illinois 61790-5120, USA.
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MeSH Terms
Ankle Injuries / physiopathology
Ankle Joint / innervation,  physiology*
Exercise / physiology*
Isotonic Contraction / physiology
Muscle Fatigue / physiology*
Peroneal Nerve / physiology*
Proprioception / physiology
Range of Motion, Articular / physiology
Tendons / innervation,  physiology*
Young Adult

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

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