Analysis of Lower Extremity Muscle Activation Using EMG

2014 ◽  
Vol 573 ◽  
pp. 797-802
Author(s):  
L. Vidhya ◽  
S. Saranya ◽  
S. Poonguzhali
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Surface Emg ◽  
Control Group ◽  
Therapy Planning ◽  
Activation Patterns ◽  
Gait Patterns ◽  
Lower Limb Muscles ◽  
Lower Extremity Muscle ◽  
Pathological Gait

Electromyography (EMG) has been widely used as a tool to understand and distinguish between normal and pathological gait. This study aims at understanding the activation patterns of lower limb muscles viz. Gastrocnemius and Tibialis Anterior in the dominant leg of subjects with normal (n=5) as well as pathological (n=2) gait patterns. The paper presents a normative pattern of these muscles during normal walking condition from which the deviation of affected group from the control group is observed. For this analysis, Surface EMG signals along with Force Sensitive Resistor values are acquired. These surface EMG signals picked up during the muscle activity are interfaced with a PC via EMG acquisition system. The acquired signals were processed and analyzed which can be used for rehabilitative therapy planning.

scholarly journals Active Passive Nature of Assistive Wearable Gait Augment Suit for Enhanced Mobility

2018 ◽  
Vol 30 (5) ◽  
pp. 717-728 ◽  
Author(s):  
Chetan Thakur ◽  
Kazunori Ogawa ◽  
Yuichi Kurita ◽  
◽  
◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Feedforward Control ◽  
Surface Emg ◽  
Walking Gait ◽  
Lower Limb Muscles ◽  
Air Supply ◽  
Pilot Trials ◽  
Pneumatic Valves ◽  
Enhanced Mobility

In this paper we discuss the active and passive nature of the assistive wearable gait augment suit (AWGAS). AWGAS is a soft, wearable, lightweight, and assists walking gait by reducing muscle activation during walking. It augments walking by reducing the muscle activation of the posterior and anterior muscles of the lower limb. The suit uses pneumatic gel muscles (PGM), foot sensors for gait detection, and pneumatic valves to control the air pressure. The assistive force is provided using the motion in loop feedforward control loop using foot sensors in shoes. PGMs are actuated with the help of pneumatic valves and portable air tanks. The elastic nature of the PGM allows AWGAS to assist walking in the absence of the air supply which makes AWGAS both active and passive walking assist suit. To evaluate the active and passive nature of the AWGAS, we experimented to measure surface EMG (sEMG) of the lower limb muscles. sEMG was recorded for unassisted walking, i.e., without the suit, passive assisted walking, i.e., wearing the suit with no air supply and active assisted walking, i.e., wearing the suit with air supply set at 60 kPa. The results shows reduction in the muscle activity for both passive and active assisted walking as compared to unassisted walking. The pilot trials of the AWGAS were conducted in collaboration with local farmers in the Hiroshima prefecture in Japan where feedback received is complementing the results obtained during the experiments.

Lower limb muscle activation patterns in ice-hockey skating and associations with skating speed

2021 ◽  
pp. 1-16
Author(s):  
Sami Kaartinen ◽  
Mika Venojärvi ◽  
Kim J Lesch ◽  
Heikki Tikkanen ◽  
Paavo Vartiainen ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Ice Hockey ◽  
Lower Limb Muscle ◽  
Limb Muscle ◽  
Activation Patterns ◽  
Muscle Activation Patterns

Deficits in anticipatory inhibition of postural muscle activity associated with load release while standing in individuals with spastic diplegic cerebral palsy

2013 ◽  
Vol 109 (8) ◽  
pp. 1996-2006 ◽  
Author(s):  
Hidehito Tomita ◽  
Yoshiki Fukaya ◽  
Kenji Totsuka ◽  
Yuri Tsukahara
Keyword(s):  
Cerebral Palsy ◽  
Lower Limb ◽  
Muscle Activity ◽  
Erector Spinae ◽  
Lower Limbs ◽  
Control Group ◽  
Lower Limb Muscles ◽  
Limb Muscles ◽  
Postural Muscle ◽  
Load Release

This study aimed to determine whether individuals with spastic diplegic cerebral palsy (SDCP) have deficits in anticipatory inhibition of postural muscle activity. Nine individuals with SDCP (SDCP group, 3 female and 6 male, 13–24 yr of age) and nine age- and sex-matched individuals without disability (control group) participated in this study. Participants stood on a force platform, which was used to measure the position of the center of pressure (CoP), while holding a light or heavy load in front of their bodies. They then released the load by abducting both shoulders. Surface electromyograms were recorded from the rectus abdominis, erector spinae (ES), rectus femoris (RF), medial hamstring (MH), tibialis anterior (TA), and gastrocnemius (GcM) muscles. In the control group, anticipatory inhibition before load release and load-related modulation of the inhibition were observed in all the dorsal muscles recorded (ES, MH, and GcM). In the SDCP group, similar results were obtained in the trunk muscle (ES) but not in the lower limb muscles (MH and GcM), although individual differences were seen, especially in MH. Anticipatory activation of the ventral lower limb muscles (RF and TA) and load-related modulation of the activation were observed in both participant groups. CoP path length during load release was longer in the SDCP group than in the control group. The present findings suggest that individuals with SDCP exhibit deficits in anticipatory inhibition of postural muscles at the dorsal part of the lower limbs, which is likely to result in a larger disturbance of postural equilibrium.

scholarly journals Human kinematic, kinetic and EMG data during different walking and stair ascending and descending tasks

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Tiziana Lencioni ◽  
Ilaria Carpinella ◽  
Marco Rabuffetti ◽  
Alberto Marzegan ◽  
Maurizio Ferrarin
Keyword(s):  
Lower Limb ◽  
Center Of Pressure ◽  
Center Of Mass ◽  
Simulation Models ◽  
Human Locomotion ◽  
Surface Emg ◽  
Whole Body ◽  
Bipedal Robots ◽  
Lower Limb Muscles ◽  
Reaction Forces

AbstractThis paper reports the kinematic, kinetic and electromyographic (EMG) dataset of human locomotion during level walking at different velocities, toe- and heel-walking, stairs ascending and descending. A sample of 50 healthy subjects, with an age between 6 and 72 years, is included. For each task, both raw data and computed variables are reported including: the 3D coordinates of external markers, the joint angles of lower limb in the sagittal, transversal and horizontal anatomical planes, the ground reaction forces and torques, the center of pressure, the lower limb joint mechanical moments and power, the displacement of the whole body center of mass, and the surface EMG signals of the main lower limb muscles. The data reported in the present study, acquired from subjects with different ages, represents a valuable dataset useful for future studies on locomotor function in humans, particularly as normative reference to analyze pathological gait, to test the performance of simulation models of bipedal locomotion, and to develop control algorithms for bipedal robots or active lower limb exoskeletons for rehabilitation.

Lower-Limb Muscle-Activation Patterns During Off-Axis Elliptical Compared With Conventional Gluteal-Muscle-Strengthening Exercises

2016 ◽  
Vol 25 (2) ◽  
pp. 164-172 ◽  
Author(s):  
Cindy Y. Lin ◽  
Liang-Ching Tsai ◽  
Joel Press ◽  
Yupeng Ren ◽  
Sun G. Chung ◽  
...  
Keyword(s):  
Internal Rotation ◽  
Lower Limb ◽  
Muscle Activation ◽  
Evidence Synthesis ◽  
Weight Bearing ◽  
Gluteal Muscle ◽  
Activation Patterns ◽  
Muscle Activation Patterns ◽  
Strengthening Exercises ◽  
Single Leg Squat

Context:Gluteal-muscle strength has been identified as an important component of injury prevention and rehabilitation in several common knee injuries. However, many conventionally prescribed gluteal-strengthening exercises are not performed during dynamic weight-bearing activities, which is when most injuries occur.Objectives:To compare lower-limb muscle-activation patterns between conventional gluteal-strengthening exercises and off-axis elliptical exercises with motorized foot-plate perturbations designed to activate gluteal muscles during dynamic exercise.Evidence Acquisition:Twelve healthy volunteers (26.1 ± 4.7 y) participated in the study. They performed 3 conventional exercises (single-leg squat, forward lunge, and clamshell) and 3 elliptical exercises (regular, while resisting an adduction force, and while resisting an internal-rotation torque). Gluteus medius (GMed) and maximus (GMax), quadriceps, hamstrings, and gastrocnemius muscle activations during each exercise were recorded using surface electromyography (EMG) and normalized to maximal voluntary isometric contraction (MVIC).Evidence Synthesis:Normalized GMed EMG was the highest during the adduction-resistance elliptical exercise (22.4% ± 14.8% MVIC), significantly greater than forward lunge (8.2% ± 3.8% MVIC) and regular elliptical (6.4% ± 2.5% MVIC) and similar to clamshell (19.1% ± 8.8% MVIC) and single-leg squat (18.4% ± 7.9% MVIC). Normalized GMax EMG during adduction-resistance (11.1% ± 7.6% MVIC) and internal-rotation-resistance elliptical (7.4% ± 3.8% MVIC) was significantly greater than regular elliptical (4.4% ± 2.4% MVIC) and was similar to conventional exercises. The single-leg squat required more muscle activation from the quadriceps and gastrocnemius than the elliptical exercises.Conclusions:Off-axis elliptical exercise while resisting an adduction force or internal-rotation torque activates gluteal muscles dynamically while avoiding excessive quadriceps activation during a functional weight-bearing activity compared with conventional gluteal-strengthening exercises.

Lower Extremity Muscle Morphology and Plantar Loading During Squatting with Different Heel Heights

2020 ◽  
Vol 10 (5) ◽  
pp. 1210-1215
Author(s):  
Tanyan Xie ◽  
Yan Zhang ◽  
Jan Awrejcewicz ◽  
Yaodong Gu
Keyword(s):  
Lower Limb ◽  
Plantar Pressure ◽  
Muscle Thickness ◽  
Pennation Angle ◽  
The Body ◽  
Muscle Morphology ◽  
Lower Limb Muscles ◽  
Heel Height ◽  
Lower Extremity Muscle ◽  
Limb Muscles

Objective: Although it is widely reported that high-heeled changes gait pattern in terms of motions and forces throughout the body, the biomechanics while high-heeled squatting has not been examined. This study aimed to explore the acute effects of different heel heights on muscle morphology and plantar loading during high-heeled squatting. Methods: Fourteen healthy females performed squats on high-heeled shoes with different heights: flat (0.8 cm), moderate (4.0 cm), and high (7.0 cm). Muscle thickness and pennation angle of selected lower limb muscles were measured by ultrasound imaging. Plantar pressure distribution and COP trajectory during an entire squatting motion were recorded. Results: As the heel height increased, the average and peak pressure consistently increased in the heel and hallux regions, while reversely changed in MF and LF regions. In addition, the selected lower limb muscles except for the lateral gastrocnemius and vastus medialis showed significant differences in muscle thickness and pennation angle between heel heights. Conclusion: The findings of this study indicate that increased heel height would enhance the immediate effects on muscle morphology as well as plantar pressure redistribution potentially causing lower limb muscle fatigue and injuries.

Sign in / Sign up

Export Citation Format

Share Document