Knee malalignment influences the electromyographic activity of selected lower limb muscles during gait in boy adolescents

Anbarian, Mehrdad; Jafarnezhad, AmirAli

doi:10.1016/j.gaitpost.2015.06.077

Cited by 4 publications

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“…The kinematic data were processed in the Qualisys Track Manager software. The EMG data were processed in the Mega Win 6000 system [18]. Then the data were sorted and analyzed in Excel.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Surface Electromyography of Forehand Smash of Badminton Players

Zhang¹

2021

Molecular &Amp; Cellular Biomechanics

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To understand the characteristics of the forehand smash of badminton player and improve their performance, this study took eight badminton players as the subject, obtained the kinematics data through the Qualisys infrared high-speed camera, obtained the electromyography (EMG) data through the ME-6000 surface EMG test system, and compared and analyzed their forehand smash action. The results showed that the greater the angle and speed of different joints in the forehand smash was, the greater the speed and strength of hitting the ball was; the discharge amount of biceps brachii (BB) was the smallest, followed by triceps brachii (TB), flexor carpi ulnaris (FCU), anterior deltoid (AD), posterior deltoid (FD), and pectoralis major (PM), and the activation order was PM → AD → FD → BB → TB → FCU; deltoid muscle and pectoralis major muscle were the main muscle groups in the exercise, which showed the characteristic that trunk muscles drove arm muscles.

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“…The kinematic data were processed in the Qualisys Track Manager software. The EMG data were processed in the Mega Win 6000 system [18]. Then the data were sorted and analyzed in Excel.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Surface Electromyography of Forehand Smash of Badminton Players

Zhang¹

2021

Molecular &Amp; Cellular Biomechanics

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“…In this context, Liu et al postulated that the abductors primarily support body weight by contributing a large medial GRF at all walking speeds, the vasti, gastrocnemius, and soleus influence both, forward progression and body weight support [ 36 ]. Also, it has been demonstrated that electromyographical activity of the biceps femoris muscle was significantly higher in boys with genu varus compared to healthy controls during the loading response phase of walking [ 14 ]. In the present study, we observed higher mediolateral GRF (Fx) in genu varus patients which is primarily caused by varus malalignment and to a lesser extent by muscular disorders [ 14 ].…”

Section: Discussionmentioning

confidence: 99%

“…Also, it has been demonstrated that electromyographical activity of the biceps femoris muscle was significantly higher in boys with genu varus compared to healthy controls during the loading response phase of walking [ 14 ]. In the present study, we observed higher mediolateral GRF (Fx) in genu varus patients which is primarily caused by varus malalignment and to a lesser extent by muscular disorders [ 14 ]. In young individuals with varus malalignment, abnormally high knee internal rotation and hip external rotation moments were detected during walking which may increase the risk of sustaining knee injuries [ 6 ].…”

Section: Discussionmentioning

confidence: 99%

“…With reference to the relevant literature [ 5 , 6 ], we hypothesized that the vertical (Fz) and mediolateral (Fx) GRF during running is higher in children with genu varus compared to their healthy peers. In addition, we expected higher loading rates, mediolateral impulses, and FM in children with genu varus compared to healthy controls which is indicative of an altered neuromuscular activation strategy [ 5 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

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A comparison of running kinetics in children with and without genu varus: A cross sectional study

et al. 2017

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IntroductionVarus knee alignment has been identified as a risk factor for the progression of medial knee osteoarthritis. However, the underlying mechanisms have not been elucidated yet in children. Thus, the aims of the present study were to examine differences in ground reaction forces, loading rate, impulses, and free moment values during running in children with and without genu varus.MethodsThirty-six boys aged 9–14 volunteered to participate in this study. They were divided in two age-matched groups (genu varus versus healthy controls). Body weight adjusted three dimensional kinetic data (Fx, Fy, Fz) were collected during running at preferred speed using two Kistler force plates for the dominant and non-dominant limb.ResultsIndividuals with knee genu varus produced significantly higher (p = .01; d = 1.09; 95%) body weight adjusted ground reaction forces in the lateral direction (Fx) of the dominant limb compared to controls. On the non-dominant limb, genu varus patients showed significantly higher body weight adjusted ground reaction forces values in the lateral (p = .01; d = 1.08; 86%) and medial (p < .001; d = 1.55; 102%) directions (Fx). Further, genu varus patients demonstrated 55% and 36% greater body weight adjusted loading rates in the dominant (p < .001; d = 2.09) and non-dominant (p < .001; d = 1.02) leg, respectively. No significant between-group differences were observed for adjusted free moment values (p>.05).DiscussionHigher mediolateral ground reaction forces and vertical loading rate amplitudes in boys with genu varus during running at preferred running speed may accelerate the development of progressive joint degeneration in terms of the age at knee osteoarthritis onset. Therefore, practitioners and therapists are advised to conduct balance and strength training programs to improve lower limb alignment and mediolateral control during dynamic movements.

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Comparison the time to stabilization and activity of the lower extremity muscles during jump-landing in subjects with and without Genu Varum

2018

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Knee malalignment influences the electromyographic activity of selected lower limb muscles during gait in boy adolescents

Cited by 4 publications

References 0 publications

Characteristics of Surface Electromyography of Forehand Smash of Badminton Players

Characteristics of Surface Electromyography of Forehand Smash of Badminton Players

A comparison of running kinetics in children with and without genu varus: A cross sectional study

Comparison the time to stabilization and activity of the lower extremity muscles during jump-landing in subjects with and without Genu Varum

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