An evaluation of tibialis anterior muscle activity in patients with spasticity using electrophysiological methods

2014 ◽  
Author(s):  
Veysel Alcan ◽  
Mehmet Rahmi Canal ◽  
Murat Zinnuroglu
Keyword(s):  
Muscle Activity ◽  
Tibialis Anterior ◽  
Tibialis Anterior Muscle ◽  
Electrophysiological Methods

Effect of a Forefoot Off-loading Postoperative Shoe on Muscle Activity, Posture, and Static Balance

2013 ◽  
Vol 103 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Joanne S. Paton ◽  
Katherine Thomason ◽  
Karl Trimble ◽  
James E. Metcalfe ◽  
Jonathan Marsden
Keyword(s):  
Muscle Activity ◽  
Tibialis Anterior ◽  
Peak Pressure ◽  
Postural Sway ◽  
Center Of Pressure ◽  
Ankle Instability ◽  
Tibialis Anterior Muscle ◽  
Contralateral Side ◽  
Support Surface ◽  
Ankle Muscle

Background: We investigated whether a forefoot off-loading postoperative shoe (FOPS) alters standing posture, ankle muscle activity, and static postural sway and whether any effects are altered by wearing a shoe raise on the contralateral side. Methods: Posture, ankle muscle activity, and postural sway were compared in 14 healthy participants wearing either a FOPS or a control shoe with or without a contralateral shoe raise. Participants were tested under different sensory and support surface conditions. Additionally, reductions in peak pressure under the forefoot while walking were assessed with and without a contralateral shoe raise to determine whether the FOPS continued to achieve its primary off-loading function. Results: Compared with the control condition, wearing a FOPS moved the center of pressure posteriorly, increased tibialis anterior muscle activity, and reduced ankle plantarflexor activity. These changes decreased when a contralateral shoe raise was added. No difference in postural sway was found between footwear conditions. Forefoot peak pressure was always reduced when wearing the FOPS. Conclusions: The posterior shift in center of pressure toward and behind the ankle joint axis is believed to result in the increase in tibialis anterior muscle activity that now acts as the primary stabilizer around the ankle. Instability may, therefore, increase in patients with weak tibialis anterior muscles (eg, diabetic neuropathy) who need to wear offloading devices for ulcer management. We suggest that the addition of a contralateral shoe raise fitted with a FOPS may potentially be beneficial in maintaining stability while off-loading the forefoot in this patient group. (J Am Podiatr Med Assoc 103(1): 36–42, 2013)

Modulation of tibialis anterior muscle activity changes with upright stance width

2015 ◽  
Vol 25 (1) ◽  
pp. 168-174 ◽  
Author(s):  
Thiago Lemos ◽  
Luís A. Imbiriba ◽  
Claudia D. Vargas ◽  
Taian M. Vieira
Keyword(s):  
Muscle Activity ◽  
Tibialis Anterior ◽  
Tibialis Anterior Muscle ◽  
Upright Stance

The Influence of Tibialis Anterior Muscle Activity on Rearfoot Motion during Walking

1994 ◽  
Vol 15 (2) ◽  
pp. 75-79 ◽  
Author(s):  
Mark W. Cornwall ◽  
Thomas G. Mcpoil
Keyword(s):  
Muscle Activity ◽  
Tibialis Anterior ◽  
Stance Phase ◽  
Tibialis Anterior Muscle ◽  
Two Dimensional ◽  
Muscular System ◽  
Surface Electrodes ◽  
Accurate Picture ◽  
Significant Difference ◽  
Rearfoot Motion

The purpose of this study was to determine whether tibialis anterior muscle activity influences the rate of rearfoot motion during walking. Two-dimensional rearfoot motion was recorded from 23 feet. The feet were assigned to one of two experimental groups. Muscle activity was recorded from the tibialis anterior muscle using surface electrodes. The early pronators (N = 12) reached maximal pronation within the first 20K of the stance phase. The late pronators (N = 11) reached maximal pronation only after 40% of the stance phase. The results of a C-test showed that there was a significant difference (P < .05) in the time to minimal tibialis anterior muscle activity between the two groups. These results indicate that tibialis anterior muscle activity can influence rearfoot motion during the stance phase of walking. A clinician should consider the muscular system when evaluating and designing a treatment program for patients with foot-related problems. The results of this study also indicate that static nonweightbearing evaluations alone may not provide an accurate picture of the foot during walking.

Between-subject variance in the magnitude of corticomuscular coherence during tonic isometric contraction of the tibialis anterior muscle in healthy young adults

2011 ◽  
Vol 106 (3) ◽  
pp. 1379-1388 ◽  
Author(s):  
Junichi Ushiyama ◽  
Tatsuya Suzuki ◽  
Yoshihisa Masakado ◽  
Kimitaka Hase ◽  
Akio Kimura ◽  
...  
Keyword(s):  
Isometric Contraction ◽  
Sensorimotor Cortex ◽  
Muscle Activity ◽  
Tibialis Anterior ◽  
Muscle Activation ◽  
Tibialis Anterior Muscle ◽  
Continuous Distribution ◽  
Oscillatory Activity ◽  
Moderate Intensity ◽  
Corticomuscular Coherence

Oscillatory activity of the sensorimotor cortex has been reported to show coherence with muscle activity in the 15- to 35-Hz frequency band (β-band) during weak to moderate intensity of isometric contraction. The present study examined the variance of the magnitude of the corticomuscular coherence across a large number of subjects. We quantified the coherence between EEG over the sensorimotor cortex and rectified electromyogram (EMG) from the tibialis anterior muscle during tonic isometric contraction at 30% of maximal effort in 100 healthy young individuals. We estimated the maximal peak of EEG-EMG coherence (Cohmax) and the ratio of the sum of the autopower spectral density function within the β-band to that of all frequency ranges for both EEG (EEGβ-PSD) and EMG (EMGβ-PSD) signals. The frequency histogram of Cohmax across all subjects showed a broad bell-shaped continuous distribution (range, 0.048–0.816). When the coherence was thresholded at the estimated significance level of P < 0.05 (0.114), 46 out of 100 subjects showed significant EEG-EMG coherence. Cohmax occurred within the β-band in the majority of subjects who showed significant EEG-EMG coherence ( n = 43). Furthermore, Cohmax showed significant positive correlations with both EEGβ-PSD ( r = 0.575, P < 0.001) and EMGβ-PSD ( r = 0.606, P < 0.001). These data suggest that even during simple tonic isometric contraction, the strength of oscillatory coupling between the sensorimotor cortex and spinal motoneurons varies among individuals and is a contributory factor determining muscle activation patterns such as the degree of grouped discharge in muscle activity within the β-band for each subject.

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