Effects of aging on lower extremity joint torque and muscle activation patterns during slip-induced falls

2006 ◽  
Vol 39 ◽  
pp. S87 ◽  
Author(s):  
T.E. Lockhart ◽  
J. Liu
Keyword(s):  
Lower Extremity ◽  
Muscle Activation ◽  
Joint Torque ◽  
Activation Patterns ◽  
Muscle Activation Patterns ◽  
Effects Of Aging

Alterations in lower extremity movement and muscle activation patterns in individuals with knee osteoarthritis

2004 ◽  
Vol 19 (1) ◽  
pp. 44-49 ◽  
Author(s):  
John D Childs ◽  
Patrick J Sparto ◽  
G.Kelley Fitzgerald ◽  
Mario Bizzini ◽  
James J Irrgang
Keyword(s):  
Lower Extremity ◽  
Knee Osteoarthritis ◽  
Muscle Activation ◽  
Activation Patterns ◽  
Muscle Activation Patterns

Influence of Ankle Injury on Muscle Activation and Postural Control During Ballet Grand Plié

2014 ◽  
Vol 30 (1) ◽  
pp. 37-49 ◽  
Author(s):  
Chia-Wei Lin ◽  
Fong-Chin Su ◽  
Cheng-Feng Lin
Keyword(s):  
Lower Extremity ◽  
Tibialis Anterior ◽  
Muscle Activation ◽  
Center Of Pressure ◽  
Ankle Injury ◽  
Medial Gastrocnemius ◽  
Ankle Sprains ◽  
Activation Patterns ◽  
Temporal Muscle ◽  
Muscle Activation Patterns

Ballet deep squat with legs rotated externally (grand plié) is a fundamental movement for dancers. However, performing this task is a challenge to ankle control, particularly for those with ankle injury. Thus, the purpose of this study was to investigate how ankle sprains affect the ability of postural and muscular control during grand plié in ballet dancers. Thirteen injured dancers and 20 uninjured dancers performed a 15 second grand plié consisting of lowering, squatting, and rising phases. The lower extremity motion patterns and muscle activities, pelvic orientation, and center of pressure (COP) excursion were measured. In addition, a principal component analysis was applied to analyze waveforms of muscle activity in bilateral medial gastrocnemius, peroneus longus, and tibialis anterior. Our findings showed that the injured dancers had smaller pelvic motions and COP excursions, greater maximum angles of knee flexion and ankle dorsiflexion as well as different temporal activation patterns of the medial gastrocnemius and tibialis anterior. These findings suggested that the injured dancers coped with postural challenges by changing lower extremity motions and temporal muscle activation patterns.

scholarly journals The Effect of External Weight Distribution on Muscle Activation Pattern during Obstacle Negotiation for Male Participants

2019 ◽  
Vol 63 (1) ◽  
pp. 37-41
Author(s):  
Guofu Yi ◽  
Xinting Wang ◽  
Junxia Zhang ◽  
Shuai Hao ◽  
Boyi Hu
Keyword(s):  
Lower Extremity ◽  
Load Distribution ◽  
Muscle Activation ◽  
Age Groups ◽  
External Loading ◽  
Activation Pattern ◽  
Activation Patterns ◽  
Muscle Activation Pattern ◽  
Muscle Activation Patterns ◽  
Lower Extremity Muscle

Effects of different age groups and different external loading distribution on lower extremity muscle activation during obstacle crossing tasks were tested in this study. Four young participants and five healthy senior participants performed different walking tasks at their own speed carrying multiple different weights while their lower extremity muscle activation patterns were recorded and compared. Older adults showed significantly increased muscle activation patterns in obstacle negotiation. Furthermore, participants showed altered lower extremity muscle activation patterns with different load distribution.

scholarly journals Training muscle activation patterns of the lower paretic extremity using directional exertion improves mobility in persons with hemiparesis: a pilot study

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Daniel Bourbonnais ◽  
René Pelletier ◽  
Joëlle Azar ◽  
Camille Sille ◽  
Michel Goyette
Keyword(s):  
Lower Extremity ◽  
Muscle Activation ◽  
Force Feedback ◽  
Sagittal Plane ◽  
Gait Velocity ◽  
Static Force ◽  
Activation Patterns ◽  
Feedback Training ◽  
Muscle Activation Patterns ◽  
Before And After

Abstract Background Controlled static exertion performed in the sagittal plane on a transducer attached to the foot requires coordinated moments of force of the lower extremity. Some exertions and plantarflexion recruit muscular activation patterns similar to synergies previously identified during gait. It is currently unknown if persons with hemiparesis following stroke demonstrate similar muscular patterns, and if force feedback training utilizing static exertion results in improved mobility in this population. Methods Electromyographic (EMG) activity of eight muscles of the lower limb were recorded using surface electrodes in healthy participants (n = 10) and in persons with hemiparesis (n = 8) during an exertion exercise (task) performed in eight directions in the sagittal plane of the foot and a plantarflexion exercise performed at 20 and 40% maximum voluntary effort (MVE). Muscle activation patterns identified during these exertion exercises were compared between groups and to synergies reported in the literature during healthy gait using cosine similarities (CS). Functional mobility was assessed in four participants with hemiparesis using GAITRite® and the Timed Up and Go (TUG) test at each session before, during and after static force feedback training. Tau statistics were used to evaluate the effect on mobility before and after training. Measures of MVE and the accuracy of directional exertion were compared before and after training using ANOVAs. Spearman Rho correlations were also calculated between changes in these parameters and changes in mobility before and after the training. Results Muscle activation patterns during directional exertion and plantarflexion were similar for both groups of participants (CS varying from 0.845 to 0.977). Muscular patterns for some of the directional and plantarflexion were also similar to synergies recruited during gait (CS varying from 0.847 to 0.951). Directional exertion training in hemiparetic subjects resulted in improvement in MVE (p < 0.040) and task performance accuracy (p < 0.001). Hemiparetic subjects also demonstrated significant improvements in gait velocity (p < 0.032) and in the TUG test (p < 0.022) following training. Improvements in certain directional efforts were correlated with changes in gait velocity (p = 0.001). Conclusion Static force feedback training following stroke improves strength and coordination of the lower extremity while recruiting synergies reported during gait and is associated with improved mobility.

An EMG-Driven Forward Dynamics Model to Simulate Stance Phase of Gait

2009 ◽  
Author(s):  
Qi Shao ◽  
Kurt Manal ◽  
Thomas S. Buchanan
Keyword(s):  
Muscle Activation ◽  
Stance Phase ◽  
Control Strategies ◽  
Neuromuscular Control ◽  
Human Movement ◽  
Joint Torque ◽  
Forward Dynamics ◽  
Activation Patterns ◽  
Joint Torques ◽  
Muscle Activation Patterns

Simulations based on forward dynamics have been used to identify the biomechanical mechanisms how human movement is generated. They used either net joint torques [1] or muscle forces [2, 3, 4] as actuators to drive forward simulation. However, very few models used EMG-based patterns to define muscle excitations [4] or were actually driven by EMGs. Muscle activation patterns vary from subject to subject and from movement to movement, and the activations depend on the control task, sometimes quite different even for the same joint angle and joint torque [5]. Using EMG as input can account for subjects’ different muscle activation patterns and help revealing the neuromuscular control strategies.

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