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

Hyong, In Hyouk; Kang, Jong Ho

doi:10.1589/jpts.25.915

Cited by 20 publications

(21 citation statements)

References 12 publications

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“…In the present study, the WBT were selected based on their wide application related to practicality, functionality, and efficiency in promoting strengthening of lower limb muscles. Dynamic squatting exercises have been studied as important tools for rehabilitation programs, primarily those utilizing knee EMG 9 ) . According to our results, the 2 vasti muscles produce approximately 50% more activity than the RF during WBT.…”

Section: Discussionmentioning

confidence: 99%

“…Another aspect that deserves mention is the similarity between the EMG activation patterns of the vasti muscles. Considering that healthy adults with normal knees show VM/VL ratios of close to 1 9 ) , the study subjects had adequate EMG behavior for these muscles (healthy subjects). These findings could also justify the insufficiency of real-time feedback to promote additional improvements in EMG activation patterns of the quadriceps.…”

Section: Discussionmentioning

confidence: 99%

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Effects of feedback on activation of the quadriceps during weight-bearing tasks of the Wii

et al. 2015

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[Purpose] This investigation evaluated the effect of real-time feedback on electrical activation of the quadriceps during 3 weight-bearing tasks of the Wii Fit Plus®. [Subjects] Thirty male healthy volunteers were recruited. [Methods] Activation of the vastus medialis, vastus lateralis, and rectus femoris muscles was recorded during virtual lunge, single leg extension, and single leg reach exercises. Each exercise was performed twice in 3 randomized experimental conditions (with visual feedback, with auditory feedback, and with no feedback). The normalized electromyographic data (using maximum voluntary isometric contraction) were analyzed using repeated measures analysis of variance and Tukey’s test. [Results] No significant difference was found in the muscles among the feedback conditions during the 3 exercises. However, the variation in the muscle activity of the vastus medialis and vastus lateralis (18.23–29.20% of maximum voluntary isometric contraction) was higher (47–62%) than that in the rectus femoris (7.35–12.98% of maximum voluntary isometric contraction). [Conclusion] Real-time feedback did not alter quadriceps activation during the Wii tasks. Additionally, these games showed electromyographic activation levels similar to those for the same tasks outside the virtual environment. The Wii weight-bearing tasks could therefore constitute a physical activity program but without the additional benefit of feedback.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of feedback on activation of the quadriceps during weight-bearing tasks of the Wii

et al. 2015

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“…Moreover, because the delayed activity of the VMO is less than the lateral force vector produced by the VL, the iliotibial band and knee bones tend to be pulled laterally 4 ) . Hyong and Kang 5 ) observed that performing a squat on an unstable base of support, such as rubber, affects the selective activity of the VMO. Irish et al 6 ) report that a squat accompanied by isometric hip joint adduction using a pillow is effective for the selective activation of the VMO.…”

Section: Discussionmentioning

confidence: 99%

“…Accordingly, previous studies have aimed to selectively activate the VMO by applying squatting. To selectively activate the VMO, Hyong and Kang 5 ) applied squats on diverse bases of support, such as a hard plate, form, and rubber air disc. Meanwhile, Irish et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of squats accompanied by hip joint adduction on the selective activity of the vastus medialis oblique

Hyong

2015

J Phys Ther Sci

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[Purpose] This study evaluated the effective selective activation method of the vastus medialis oblique for knee joint stabilization in patients with patellofemoral pain syndrome. [Subjects and Methods] Fifteen healthy college students (9 males, 6 females); mean age, height, and weight: 22.2 years, 167.8 cm, and 61.4 kg, respectively) participated. The knee angle was held at 60°. Muscle activities were measured once each during an ordinary squat and a squat accompanied by hip joint adduction. The muscle activities of the vastus medialis oblique and vastus lateralis were measured by electromyography for five seconds while maintaining 60° knee flexion. Electromyography signals were obtained at a sampling rate of 1,000 Hz and band pass filtering at 20–50 Hz. The obtained raw root mean square was divided by the maximal voluntary isometric contraction and expressed as a percentage. The selective activity of the vastus medialis oblique was assessed according to the muscle activity ratio of the vastus medialis oblique to the vastus lateralis. [Results] The activity ratio of the vastus medialis oblique was higher during a squat with hip joint adduction than without. [Conclusion] A squat accompanied by hip joint adduction is effective for the selective activation of the vastus medialis oblique.

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“…Patellofemoral pain syndrome is a disease in which the patellar medial pulling force is weakened due to a weak vastus medialis and the patella is dislocated laterally, so it causes knee pain 6 , 10 ) . Patients with this syndrome are treated with selective strength training programs for the vastus medialis in order to decrease pain and treat the disease 11 , 12 , 13 ) , and a lot of research has been performed to identify ways to improve the vastus medialis selectively 14 , 15 , 16 ) . Thus, the muscle imbalance between the vastus medialis and lateralis could cause pain, and training programs to relieve the muscle imbalance are needed if there are imbalances between these two muscles according to knee alignment.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Differences of Quadriceps Femoris Activities by Knee Alignment during Isometric Contraction

Park

Jang

et al. 2014

J Phys Ther Sci

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[Purpose] This study attempted to identify how genu varum or valgum affects the electromyographic activities of the vastus medialis, vastus lateralis, and rectus femoris during knee isometric contraction. [Subjects] Fifty-two healthy young adults were enrolled in this study. They were enrolled and classified into three groups by knee alignment conditions: the genu varum, genu valgum, and control groups. [Methods] The electromyographic activity ratio of the vastus medialis to the vastus lateralis and rectus femoris were calculated using the percentage of maximum voluntary contraction. The participants contracted their quadriceps during isometric contraction at 30 and 60° of knee flexion. [Results] The genu varum group had more activity in the vastus medialis than in the vastus lateralis and rectus femoris, whereas the genu valgum group had more activity in the vastus lateralis and rectus femoris than in the vastus medialis. There was a significant difference in the muscle activity ratio between the vastus medialis and vastus lateralis by angle of knee flexion degree only in the genu valgum. There were no significant differences in any of the three groups in terms of the muscle activity ratio of the vastus medialis to the rectus femoris by angle of knee flexion. [Conclusion] The quadriceps femoris was used for different strategies according to knee alignment during isometric contraction at 30 and 60°. This study suggests that rehabilitation training programs used to strengthen the quadriceps should consider the knee alignment conditions of the target subjects.

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

Cited by 20 publications

References 12 publications

Effects of feedback on activation of the quadriceps during weight-bearing tasks of the Wii

Effects of feedback on activation of the quadriceps during weight-bearing tasks of the Wii

Effects of squats accompanied by hip joint adduction on the selective activity of the vastus medialis oblique

A Study on the Differences of Quadriceps Femoris Activities by Knee Alignment during Isometric Contraction

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