Activation of VMO and VL in Squat Exercises for Women with Different Hip Adduction Loads

Jang, Eun Mi; Heo, Hyo Jin; Kim, Mi‐Hyun; Yoo, Won Gyu

doi:10.1589/jpts.25.257

Cited by 14 publications

(15 citation statements)

References 12 publications

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“…Therefore, both balance and stability between the vastus medialis and lateralis must be acquired to correct alignment of the patella 6 ) , and to prevent and treat patellofemoral pain syndrome. Some studies have analyzed differences in muscle activities or onset timing between the vastus medialis and lateralis 7 , 8 , 9 , 10 ) . In particular, weakness is often observed in the vastus medialis, which is the first muscle to show weakness among the quadriceps muscles 11 ) .…”

Section: Introductionmentioning

confidence: 99%

Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum

Park

Kong

et al. 2015

J Phys Ther Sci

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[Purpose] The purpose of this study was to investigate the difference in onset timing between the vastus medialis and lateralis among the different knee alignments, as well as the best isokinetic angular velocity for an isokinetic concentric contraction. [Subjects] Fifty-two adults (20 with genu varum, 12 genu valgum, and 20 controls) were enrolled in this study. Subjects with > 4 cm between the medial epicondyles of the knee were placed in the genu varum group, whereas subjects with > 4 cm between the medial malleolus of the ankle were placed in the genu valgum group. [Methods] Surface electromyography was used to measure the onset times of the vastus medialis and vastus lateralis during concentric contractions at 30, 60, and 90°/sec. [Results] The vastus lateralis showed more delayed firing than the vastus medialis in the genu varum group, whereas vastus medialis firing was delayed more than that of the vastus lateralis in the genu valgum group. No differences in onset timing were observed between the vastus medialis and lateralis according the different angular velocities during concentric contractions in all three groups. [Conclusion] Genu varum and valgum affect quadriceps firing. Therefore, selective rehabilitation training of the quadriceps femoris should be considered to prevent pain or knee malalignment deformities.

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Section: Introductionmentioning

confidence: 99%

Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum

Park

Kong

et al. 2015

J Phys Ther Sci

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“…The authors reported that the muscle activity of the quadriceps increased after the experiment in both groups. Jang et al 13 ) argued that 40–80% hip adduction loading is effective in strengthening the vastus medialis oblique muscle during squat exercises. Meanwhile, Hyong and Kang 14 ) argued that unstable surfaces are effective in activating and reinforcing the vastus medialis oblique muscle during squat exercises.…”

Section: Discussionmentioning

confidence: 99%

Impact of decline-board squat exercises and knee joint angles on the muscle activity of the lower limbs

Lee

Park

2015

J Phys Ther Sci

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[Purpose] This study aims to investigate how squat exercises on a decline board and how the knee joint angles affect the muscle activity of the lower limbs. [Subjects] The subjects were 26 normal adults. [Methods] A Tumble Forms wedge device was used as the decline board, and the knee joint angles were measured with a goniometer. To examine the muscle activity of the biceps femoris, rectus femoris, gastrocnemius lateralis, and tibialis anterior of the lower limbs, a comparison analysis with electromyography was conducted. [Results] The muscle activity of the biceps femoris, rectus femoris, gastrocnemius lateralis, and tibialis anterior increased with increased knee joint angles, both for squat exercises on the decline board and on a flat floor. When the knee joint angle was 45°, 60°, and 90°, the muscle activity of the rectus femoris was significantly higher and that of the tibialis anterior was significantly lower during squat exercises on the decline board than on the flat floor. When the knee joint angle was 90°, the muscle activity of the gastrocnemius lateralis was significantly lower. [Conclusion] Squat exercises on a decline board are an effective intervention to increase the muscle activity of the rectus femoris with increased knee joint angles.

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“…Open-kinetic exercises are performed with the legs flat on the floor and spread apart, whereas closed-kinetic exercises are executed with the feet firmly on the floor. Squat exercises are closed-kinetic exercises and are effective for muscle strengthening 6 ) . Squat movements generate the co-activation of the ankle, knee, and hip joint.…”

Section: Discussionmentioning

confidence: 99%

Analysis of muscle activations in lower extremities muscles at various angles of ankle flexion using wedges during static squat exercise

2015

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[Purpose] This study aimed to investigate changes in activation of the rectus femoris, biceps femoris, tibialis anterior, and gastrocnemius muscles during one-legged squats performed at various angles of ankle flexion. With the use of wedges, the muscles were activated at different angles of ankle flexion angles to establish the appropriate posture necessary for muscle strengthening and rehabilitation. [Subjects and Methods] Healthy adults aged 20–40 years were recruited from Good Morning Hospital in Ulsan City. Of the 22 participants, two dropped out during the tests, leaving a final sample of 20 participants. The wedges were 100 mm wide and 200 mm long and had inclinations of 10°, 30°, and 50°. EMG Analyzer software was used to measure muscle activation. [Results] A significant difference in the activation of the rectus femoris muscle at various angles of ankle flexion was seen. The gastrocnemius muscle exhibited significant differences in activation among the 0°–30°, 0°–50°, and 10°–50° inclinations. [Conclusion] Wedge-assisted muscle activation under different ankle flexion angles can be introduced as an effective exercise option under clinical conditions.

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Activation of VMO and VL in Squat Exercises for Women with Different Hip Adduction Loads

Cited by 14 publications

References 12 publications

Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum

Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum

Impact of decline-board squat exercises and knee joint angles on the muscle activity of the lower limbs

Analysis of muscle activations in lower extremities muscles at various angles of ankle flexion using wedges during static squat exercise

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