EMG Activation of the Vastus Medialis Oblique and Vastus Lateralis During Four Rehabilitative Exercises

Kushion, Debra E.

doi:10.2174/1874943701205010001

Cited by 20 publications

(15 citation statements)

References 36 publications

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“…According the results of this study and previous studies, there is no agreement on muscles weakness or decrease in VMO/VL ratio [36]. Some studies reported muscles weakness and decrease in VMO/VL ratio [17,18], while others reported no significant associations in this regard [1,2,19,34]. Additionally, the effectiveness of exercises for the efficient activity of VMO muscle and improvement of VMO/VL ratio still remains unclear.…”

Section: Discussioncontrasting

confidence: 74%

“…However, they investigated quadriceps muscle activity as a whole and disregarded different parts of quadriceps separately, and lacked a control group. Moreover, Soderberg et al reported higher activation of Rectus Femoris (RF) than vasti muscles during SLR [1,32]. Sykes and Wong reported that additional hip rotation, especially external rotation to SLR had a significant effect on the EMG amplitude of VMO [33].…”

Section: Discussionmentioning

confidence: 99%

“…atellofemoral Pain Syndrome (PFPS) is a frequent knee problem, mostly reported in females and athletes. Patients with PFPS experience anterior or retropatellar knee pain during movements such as running, jumping, climbing the stairs, or quad sitting for a long time [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Comparing Electromyographic Activity of Quadriceps Muscle During Straight Leg Raise in Individuals With and Without Patellofemoral Pain Syndrome

Lotfi

Moghadam

Shati

2018

PTJ

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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. Conclusion: These data suggest that not all individuals with PFPS had weak quadriceps muscles. Many factors may contribute to PFPS that should be considered in the assessment and rehabilitation of individuals with PFPS.

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Section: Discussioncontrasting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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Comparing Electromyographic Activity of Quadriceps Muscle During Straight Leg Raise in Individuals With and Without Patellofemoral Pain Syndrome

Lotfi

Moghadam

Shati

2018

PTJ

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“…For example, during walking greater EMG amplitude is observed in the medial than the lateral gastrocnemius in %50% of participants, whereas the other half has similar EMG amplitude of both muscles [9]. Similarly, during a wide range of tasks, some [10,11], but not all [12], studies report greater EMG amplitude of the lateral (vastus lateralis, VL) than the medial (vastus medialis, VM) head of the quadriceps with a large difference between individuals (e.g. ratio of VL/VM activation ranges from %0.8 to 3 [10]).…”

Section: Introductionmentioning

confidence: 96%

Nature of the coupling between neural drive and force-generating capacity in the human quadriceps muscle

et al. 2015

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The force produced by a muscle depends on both the neural drive it receives and several biomechanical factors. When multiple muscles act on a single joint, the nature of the relationship between the neural drive and forcegenerating capacity of the synergistic muscles is largely unknown. This study aimed to determine the relationship between the ratio of neural drive and the ratio of muscle force-generating capacity between two synergist muscles (vastus lateralis (VL) and vastus medialis (VM)) in humans. Twenty-one participants performed isometric knee extensions at 20 and 50% of maximal voluntary contractions (MVC). Myoelectric activity (surface electromyography (EMG)) provided an index of neural drive. Physiological cross-sectional area (PCSA) was estimated from measurements of muscle volume (magnetic resonance imaging) and muscle fascicle length (threedimensional ultrasound imaging) to represent the muscles' force-generating capacities. Neither PCSA nor neural drive was balanced between VL and VM. There was a large (r ¼ 0.68) and moderate (r ¼ 0.43) correlation between the ratio of VL/VM EMG amplitude and the ratio of VL/VM PCSA at 20 and 50% of MVC, respectively. This study provides evidence that neural drive is biased by muscle force-generating capacity, the greater the force-generating capacity of VL compared with VM, the stronger bias of drive to the VL.

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“…Kushion et al8 ) reported that VMO/VL ratios ranged from 0.99 to 1.0 during leg raise exercises in a supine position. In the present study, a VMO/VL ratio of 0.92 was obtained in the hard plate group.…”

Section: Discussionmentioning

confidence: 99%

Activities of the Vastus Lateralis and Vastus Medialis Oblique Muscles during Squats on Different Surfaces

Hyong

Kang

2013

J Phys Ther Sci

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[Purpose] The purpose of the present study was to examine the effects of squat exercises performed on different surfaces on the activity of the quadriceps femoris muscle in order to provide information on support surfaces for effective squat exercises. [Subjects and Method] Fourteen healthy subjects performed squat exercises for five seconds each on three different support surfaces: hard plates, foam, and rubber air discs. Their performance was measured using electromyography. As the subjects performed the squat exercises on each surface, data on the activity of the vastus medialis oblique and the vastus lateralis, and the vastus medials oblique/vastus lateralis ratio, were collected. [Results] The activity of the vastus medialis oblique and the vastus medialis oblique/vastus lateralis ratio were found to be statistically significantly higher on rubber air discs than when the squats were performed on hard plates or foam. [Conclusion] To activate the vastus medialis obilique, and to enhance the vastus medialis oblique/vastus lateralis ratio, unstable surfaces that are highly unstable should be selected.

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EMG Activation of the Vastus Medialis Oblique and Vastus Lateralis During Four Rehabilitative Exercises

Cited by 20 publications

References 36 publications

Comparing Electromyographic Activity of Quadriceps Muscle During Straight Leg Raise in Individuals With and Without Patellofemoral Pain Syndrome

Comparing Electromyographic Activity of Quadriceps Muscle During Straight Leg Raise in Individuals With and Without Patellofemoral Pain Syndrome

Nature of the coupling between neural drive and force-generating capacity in the human quadriceps muscle

Activities of the Vastus Lateralis and Vastus Medialis Oblique Muscles during Squats on Different Surfaces

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