Onset timing of electromyographic activity in the vastus medialis oblique and vastus lateralis muscles in subjects with and without patellofemoral pain syndrome (original) (raw)
Related papers
Research Paper: Comparing Electromyographic Activity of Quadriceps Muscle During Straight Leg Raise in Individuals With and Without Patellofemoral Pain Syndrome Purpose: This study aimed to investigate the electromyographic activities and balance of Vastus Medialis Obliquus (VMO) and Vastus Lateralis (VL) muscles during Straight Leg Raise (SLR) in individuals with and without Patellofemoral Pain Syndrome (PFPS). Methods: Through an analytical case-control study, 26 persons with PFPS and 26 healthy subjects were recruited by non-random and convenience sampling method. All subjects performed SLR movement. The EMG activity of VMO, VL and VMO/VL ratio were recorded and measured. The muscles activation level were compared between the 2 groups using the Independent t test. The obtained data were analyzed using SPSS. Results: The mean and maximum EMG activity of VMO, VL and VMO/VL ratio did not have any significant differences between the PFPS and healthy groups (P>0.05). In other words, during SLR, the VMO and VL muscles activation in the PFPS group were approximately the same as the healthy group. Citation Lotfi H, Nodehi Moghadam A, Shati M. Comparing Electromyographic Activity of Quadriceps Muscle During Straight Leg Raise in Individuals With and Without Patellofemoral Pain Syndrome. Physical Treatments. 2018; 7(4):197-204.
Vastus Lateralis Oblique Activity During Gait of Subjects with Patellofemoral Pain
Revista Brasileira de Medicina do Esporte
Introduction: So far, little is known about the behavior of electromyographic activity of vastus lateralis oblique muscle during treadmill gait in subjects with and without patellofemoral pain syndrome. Objective: The purpose of this study was to investigate the electromyographic activity of the patellar stabilizers muscles and the angle of the knee joint flexion in subjects with and without patellofemoral pain syndrome. Method: Fifteen subjects without (21 ± 3 years) and 12 with patellofemoral pain syndrome (20 ± 2 years) were evaluated. The electromyographic activity and flexion angle of the knee joint were obtained during gait on the treadmill with a 5 degree inclination. Results: The knee flexion angle was significantly lower in the subjects with patellofemoral pain syndrome when compared with the healthy controls. The electromyographic activity of vastus lateralis longus was significantly greater during gait on the treadmill with inclination in subjects with patellofemoral pain...
The Journal of orthopaedic and sports physical therapy, 2015
Synopsis Muscle force cannot be directly inferred from neural drive assessed using electromyography (EMG). Although the limitations associated with inferring force from EMG are well known, this has received little attention in the clinical literature. This commentary discusses these limitations within the context of the issue of imbalance of force production between the vastus medialis (VM) and vastus lateralis (VL) muscles, which has been speculated to contribute to the development and/or persistence of patellofemoral pain. The balance of neural drive between Vastii muscles is most frequently measured with 2 approaches: 1) the onset of VM EMG relative to that of VL and 2) the ratio of the EMG signal amplitude of the VM and VL. Here we demonstrate that this classical approach cannot resolve the issue of whether an imbalance of force exists between VM and VL. Considerations such as altered electromechanical delay (time between the onsets of muscle activation and patella motion) in pe...