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J. Funct. Morphol. Kinesiol. 2016, 1(2), 193-199; doi:10.3390/jfmk1020193

Myoelectric Manifestations of Fatigue after ACL Reconstruction: A Cross-Sectional Study after Postoperative Rehabilitation

1
Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, 6928 Manno, Switzerland
2
Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, 7302 Landquart, Switzerland
3
Ars Medica Clinic, 6929 Gravesano, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editor: Giuseppe Musumeci
Received: 21 March 2016 / Revised: 11 April 2016 / Accepted: 13 April 2016 / Published: 15 April 2016
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Abstract

An increased fatigability associated with anterior cruciate ligament (ACL) injury may persist several months after surgery. The purpose of this study was to investigate the behavior of muscle fiber conduction velocity (CV) as a descriptor of myoelectric fatigue, at different stages after rehabilitation, post-ACL reconstruction. Nineteen subjects acted as control group (CG), 10 patients had undergone surgery within 12 months (R12), and 23 patients were more than 24 months post-surgery (R24+). Surface electromyography (EMG) signals were detected from the quadriceps femoris using bidimensional arrays during isometric contractions at 20% and 60% maximal voluntary contraction (MVC). We observed a lower fatigability in the R24+ group during the 60% MVC contraction, with respect to the other groups. Lower fatigability of quadriceps muscle after ACL reconstruction in the long term may be linked to a recovery from a transitory altered motor unit recruitment strategy due to surgery, observed in the R12 group. Therefore, the findings of this study do not suggest an impaired fatigability of the quadriceps muscle during sustained isometric contractions in active patients in the long term. View Full-Text
Keywords: anterior cruciate ligament reconstruction (ACLr); fatigability; muscle fiber conduction velocity; surface electromyography (EMG); quadriceps femoris; motor unit anterior cruciate ligament reconstruction (ACLr); fatigability; muscle fiber conduction velocity; surface electromyography (EMG); quadriceps femoris; motor unit
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Beretta-Piccoli, M.; Schneebeli, A.; Egloff, M.; Cescon, C.; Clijsen, R.; Togninalli, D.; Barbero, M. Myoelectric Manifestations of Fatigue after ACL Reconstruction: A Cross-Sectional Study after Postoperative Rehabilitation. J. Funct. Morphol. Kinesiol. 2016, 1, 193-199.

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J. Funct. Morphol. Kinesiol. EISSN 2411-5142 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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