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Titre : | Vastus Lateralis Motor Unit Firing Rate Is Higher in Women With Patellofemoral Pain (2018) |
Auteurs : | Alessio Gallina ; Michael A. Hunt ; Paul W. Hodges |
Type de document : | Article |
Dans : | Archives of Physical Medicine and Rehabilitation (Vol. 99, n° 5, 2018) |
Article en page(s) : | p. 907-913 |
Langues: | Anglais |
Descripteurs : |
HE Vinci Neuropsychologie ; Rééducation et réadaptation |
Mots-clés: | Knee joint ; Articulation du genou ; Neuropsychology ; Patellofemoral Pain Syndrome ; Syndrome fémoro patellaire ; Quadriceps muscle ; Muscle quadriceps fémoral |
Résumé : |
Objective To compare neural drive, determined from motor unit firing rate, in the vastus medialis and lateralis in women with and without patellofemoral pain. Design Cross-sectional study. Setting University research laboratory. Participants Women (N=56) 19 to 35 years of age, including 36 with patellofemoral pain and 20 controls. Interventions Not applicable. Main Outcome Measures Participants sustained an isometric knee extension contraction at 10% of their maximal voluntary effort for 70 seconds. Motor units (N=414) were identified using high-density surface electromyography. Average firing rate was calculated between 5 and 35 seconds after recruitment for each motor unit. Initial firing rate was the inverse of the first 3 motor unit interspike intervals. Results In control participants, vastus medialis motor units discharged at higher rates than vastus lateralis motor units (P=.001). This was not observed in women with patellofemoral pain (P=.78) because of a higher discharge rate of vastus lateralis compared with control participants (P=.002). No between-group differences were observed for vastus medialis (P=.93). Similar results were obtained for the initial motor unit firing rate. Conclusions These findings suggest that women with patellofemoral pain have a higher neural drive to vastus lateralis but not vastus medialis, which may be a contributor of the altered patellar kinematics observed in some studies. The different neural drive may be an adaptation to patellofemoral pain, possibly to compensate for decreased quadriceps force production, or a precursor of patellofemoral pain. |
Disponible en ligne : | Oui |
En ligne : | https://login.ezproxy.vinci.be/login?url=https://www.sciencedirect.com/journal/archives-of-physical-medicine-and-rehabilitation |