Diminished sub-maximal quadriceps force control in anterior cruciate ligament reconstructed patients is related to quadriceps and hamstring muscle dyskinesia

Abstract The aim of this study was to determine the effects of anterior cruciate ligament reconstruction (ACLR) on sub-maximal quadriceps force control with respect to quadriceps and hamstring muscle activity. Thirty ACLR individuals together with 30 healthy individuals participated. With real-time...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2014-08, Vol.24 (4), p.513-519
Main Authors: Telianidis, Stacey, Perraton, Luke, Clark, Ross A, Pua, Yong-Hao, Fortin, Karine, Bryant, Adam L
Format: Article
Language:English
Subjects:
ACL reconstruction
Adolescent
Adult
Anterior Cruciate Ligament - surgery
Anterior Cruciate Ligament Reconstruction - methods
Dyskinesias - physiopathology
Electromyography
Female
Force control
Hamstrings
Humans
Knee Joint - physiology
Male
Muscle activation
Physical Medicine and Rehabilitation
Quadriceps
Quadriceps Muscle - physiology
Young Adult
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Summary:Abstract The aim of this study was to determine the effects of anterior cruciate ligament reconstruction (ACLR) on sub-maximal quadriceps force control with respect to quadriceps and hamstring muscle activity. Thirty ACLR individuals together with 30 healthy individuals participated. With real-time visual feedback of muscle force output and electromyographic electrodes attached to the quadriceps and hamstring muscles, subjects performed an isometric knee extension task where they increased and decreased their muscle force output at 0.128 Hz within a range of 5–30% maximum voluntary capacity. The ACLR group completed the task with more error and increased medial hamstring and vastus medialis activation ( p < 0.05). Moderate negative correlations ( p < 0.05) were observed between quadriceps force control and medial (Spearman’s rho = −0.448, p = 0.022) and lateral (Spearman’s rho = −0.401, p = 0.034) hamstring activation in the ACLR group. Diminished quadriceps sub-maximal force control in ACLR subjects was reflective of medial quadriceps and hamstring dyskinesia (i.e., altered muscle activity patterns and coordination deficits). Within the ACLR group however, augmented hamstring co-activation was associated with better quadriceps force control. Future studies should explore the convergent validity of quadriceps force control in ACLR patients.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2014.04.014