Effects of the Early Sensorimotor Training on Vastus Medialis Oblique Muscle Activation in Patients after Partial Medial Meniscectomy

AbstractThe purpose of this study was to compare muscle activation during the squat with different hip rotations (neutral, 15, 30, and 45° of internal and external hip rotation) in subjects with and without Genu Varum deformity deformity. Surface electromyography were recorded from 32 men with (n=16) and without (n=16) Genu Varum deformity. In the Genu Varum deformity group, the squats with 30, 45 and 15° of internal rotations of the hip showed significantly greater gluteus medius activation as compared to other positions. Moreover, the tensor fascia lata activity increased with greater external rotation of the hip, and significantly more than hip internal rotations (p<0.05). For vastus medialis and vastus lateralis, both hip internal and external rotation showed a significantly greater activation compared to the neutral hip positions (p<0.05). There were significant differences in the gluteus medius:tensor fascia lata activity ratio (p=0.001) and the vastus medialis: vastus lateralis activity ratio (p=0.001) between the different hip positions in the Genu Varum deformity and healthy groups. These results demonstrate that muscle activation patterns varied significantly with the position of different hip rotation in both groups. Those with Genu Varum deformity may use this information to aid in an injury prevention strategy by choosing squat positioning that favorably alters muscle activation patterns.

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An investigation into the architecture of the vastus medialis oblique muscle in athletic and sedentary individuals: An in vivo ultrasound study

Clinical Anatomy ◽

10.1002/ca.22457 ◽

2014 ◽

Vol 28 (2) ◽

pp. 262-268 ◽

Cited By ~ 10

Author(s):

A.J. Benjafield ◽

A. Killingback ◽

C.J. Robertson ◽

P.J. Adds

Keyword(s):

Oblique Muscle ◽

Vastus Medialis ◽

Ultrasound Study

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Alterations in Neuromuscular Control at the Knee in Individuals With Chronic Ankle Instability

Journal of Athletic Training ◽

10.4085/1062-6050-49.3.28 ◽

2014 ◽

Vol 49 (5) ◽

pp. 599-607 ◽

Cited By ~ 17

Author(s):

Masafumi Terada ◽

Brian G. Pietrosimone ◽

Phillip A. Gribble

Keyword(s):

Confidence Interval ◽

Effect Size ◽

Muscle Activation ◽

Sagittal Plane ◽

Ankle Instability ◽

Force Plate ◽

Neuromuscular Control ◽

Chronic Ankle Instability ◽

Electromyographic Activity ◽

Vastus Medialis

Context: Few authors have assessed neuromuscular knee-stabilization strategies in individuals with chronic ankle instability (CAI) during functional activities. Objective: To investigate the influence of CAI on neuromuscular characteristics around the knee during a stop-jump task. Design: Case-control study. Setting: Research laboratory. Participants or Other Participants: A total of 19 participants with self-reported unilateral CAI and 19 healthy control participants volunteered for this study. Intervention(s): Participants performed double-legged, vertical stop-jump tasks onto a force plate, and we measured muscle activation around the knee of each limb. Main Outcome Measure(s): We calculated the integrated electromyography for the vastus medialis oblique, vastus lateralis, medial hamstrings, and lateral hamstrings muscles during the 100 ms before and after initial foot contacts with the force plate and normalized by the ensemble peak electromyographic value. Knee sagittal-plane kinematics were also analyzed during a stop-jump task. Results: Compared with control participants, the CAI group demonstrated greater prelanding integrated electromyographic activity of the vastus medialis oblique (CAI = 52.28 ± 11.25%·ms, control = 43.90 ± 10.13%·ms, t36 = 2.41, P = .021, effect size = 0.78, 95% confidence interval = 0.11, 1.43) and less knee-flexion angle at the point of initial foot contact (CAI = 7.81° ± 8.27°, control = 14.09° ± 8.7°, t36 = −2.28, P = .029, effect size = −0.74, 95% confidence interval = −1.38, −0.07) and at 100 ms post–initial foot contact (CAI = 51.36° ± 5.29°, control = 58.66° ± 7.66°, t36 = −3.42, P = .002, effect size = −1.11, 95% confidence interval = −1.77, −0.40). No significant results were noted for the other electromyographic measures. Conclusions: We found altered feed-forward patterns of the vastus medialis oblique and altered postlanding knee sagittal-plane kinematics in the CAI group. These observations may provide insight regarding sensorimotor characteristics that may be associated with CAI.

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Anatomical Assessment of the Vastus Medialis Oblique Muscle in Patients With Osteoarthritis of the Knee

The Journal of Arthroplasty ◽

10.1016/j.arth.2006.12.103 ◽

2008 ◽

Vol 23 (2) ◽

pp. 287-292 ◽

Cited By ~ 8

Author(s):

Nobuyoshi Watanabe ◽

Wataru Narita ◽

Takehiko Namura ◽

Hirotoshi Ito ◽

Tsunehiko Nishimura ◽

...

Keyword(s):

Oblique Muscle ◽

Osteoarthritis Of The Knee ◽

Vastus Medialis

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Trunk Muscle Activity in One- and Two-Armed American Kettlebell Swing in Resistance-Trained Men

Sports Medicine International Open ◽

10.1055/a-0869-7228 ◽

2019 ◽

Vol 03 (01) ◽

pp. E12-E18

Author(s):

Vidar Andersen ◽

Marius Fimland ◽

Atle Saeterbakken

Keyword(s):

Muscle Activation ◽

Surface Emg ◽

Contralateral Side ◽

Trunk Muscle ◽

Rectus Abdominis ◽

Erector Spinae ◽

Oblique Muscle ◽

Ipsilateral Side ◽

External Oblique ◽

The One

AbstractThe aim of the study was to compare the one-armed vs. two-armed American kettlebell swing on trunk muscle activation. Fifteen resistance-trained men performed ten repetitions of both exercises using a 14-kg kettlebell. Surface EMG from the erector spinae, rectus abdominis and external oblique muscles were collected on both sides of the trunk. The erector spinae activation during the one-armed swing was 14–25% higher on the contralateral compared to the ipsilateral side in both exercises (Cohen’s d effect size [ES]=0.41–0.71, p ˂ 0.001–0.034). Further, the contralateral side was 14% more activated during the two-armed swing compared to the ipsilateral side during the one-armed swing (ES=0.43, p=0.009). For the rectus abdominis muscle, the two-armed swing induced higher activation of the rectus abdominis compared to the one-armed swing on both the contralateral (40%, ES=0.48, p=0.040) and ipsilateral side (59%, ES=0.83, p=0.002). There were no differences for the external oblique muscle (p=0.495–0.662). In conclusion, the trunk activation patterns of the two exercises were different, which could be explained by different biomechanics in the two exercises, and could thus have complimentary effects. We recommend that both unilateral and bilateral execution of the American kettlebell swing is included over time.

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