Evaluation of the corticomuscular coherence underlying ankle force production stability

2019 ◽  
Vol 49 (3) ◽  
pp. 255
Author(s):  
Sylvain Cremoux
Keyword(s):  
Force Production ◽  
Corticomuscular Coherence

Effect of the phase of force production on corticomuscular coherence with agonist and antagonist muscles

2018 ◽  
Vol 48 (10) ◽  
pp. 3288-3298 ◽  
Author(s):  
Gauthier Desmyttere ◽  
Emilie Mathieu ◽  
Mickael Begon ◽  
Emilie Simoneau‐Buessinger ◽  
Sylvain Cremoux
Keyword(s):  
Force Production ◽  
Corticomuscular Coherence ◽  
Antagonist Muscles ◽  
Agonist And Antagonist ◽  
Agonist And Antagonist Muscles

scholarly journals Corticomuscular Coherence and Motor Control Adaptations after Isometric Maximal Strength Training

2021 ◽  
Vol 11 (2) ◽  
pp. 254
Author(s):  
Dimitri Elie ◽  
Franck Barbier ◽  
Ghassan Ido ◽  
Sylvain Cremoux
Keyword(s):  
Motor Control ◽  
Strength Training ◽  
Muscle Activation ◽  
Force Production ◽  
Maximal Strength ◽  
Antagonist Muscle ◽  
Corticomuscular Coherence ◽  
Muscle Activations ◽  
Stability And Accuracy ◽  
Over Time

Strength training (ST) induces corticomuscular adaptations leading to enhanced strength. ST alters the agonist and antagonist muscle activations, which changes the motor control, i.e., force production stability and accuracy. This study evaluated the alteration of corticomuscular communication and motor control through the quantification of corticomuscular coherence (CMC) and absolute (AE) and variable error (VE) of the force production throughout a 3 week Maximal Strength Training (MST) intervention specifically designed to strengthen ankle plantarflexion (PF). Evaluation sessions with electroencephalography, electromyography, and torque recordings were conducted pre-training, 1 week after the training initiation, then post-training. Training effect was evaluated over the maximal voluntary isometric contractions (MVIC), the submaximal torque production, AE and VE, muscle activation, and CMC changes during submaximal contractions at 20% of the initial and daily MVIC. MVIC increased significantly throughout the training completion. For submaximal contractions, agonist muscle activation decreased over time only for the initial torque level while antagonist muscle activation, AE, and VE decreased over time for each torque level. CMC remained unaltered by the MST. Our results revealed that neurophysiological adaptations are noticeable as soon as 1 week post-training. However, CMC remained unaltered by MST, suggesting that central motor adaptations may take longer to be translated into CMC alteration.

Effect of the speed of taekwondo kick execution on the muscular force production, obtained by biomechanical modeling

2019 ◽  
Vol 3 (5) ◽  
pp. 42-49
Author(s):  
Pedro Vieira Sarmet Moreira ◽  
◽  
Kristy Alejandra Godoy Jaimes ◽  
Luciano Luporini Menegaldo ◽  
◽  
...  
Keyword(s):  
Force Production ◽  
Biomechanical Modeling ◽  
Muscular Force

scholarly journals Specific modulation of corticomuscular coherence during submaximal voluntary isometric, shortening and lengthening contractions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dorian Glories ◽  
Mathias Soulhol ◽  
David Amarantini ◽  
Julien Duclay
Keyword(s):  
H Reflex ◽  
Medial Gastrocnemius ◽  
Emg Activity ◽  
Beta Band ◽  
Lengthening Contractions ◽  
Time Frequency ◽  
Corticomuscular Coherence ◽  
Emg Signal ◽  
Voluntary Contractions ◽  
Spinal Excitability

AbstractDuring voluntary contractions, corticomuscular coherence (CMC) is thought to reflect a mutual interaction between cortical and muscle oscillatory activities, respectively measured by electroencephalography (EEG) and electromyography (EMG). However, it remains unclear whether CMC modulation would depend on the contribution of neural mechanisms acting at the spinal level. To this purpose, modulations of CMC were compared during submaximal isometric, shortening and lengthening contractions of the soleus (SOL) and the medial gastrocnemius (MG) with a concurrent analysis of changes in spinal excitability that may be reduced during lengthening contractions. Submaximal contractions intensity was set at 50% of the maximal SOL EMG activity. CMC was computed in the time–frequency domain between the Cz EEG electrode signal and the unrectified SOL or MG EMG signal. Spinal excitability was quantified through normalized Hoffmann (H) reflex amplitude. The results indicate that beta-band CMC and normalized H-reflex were significantly lower in SOL during lengthening compared with isometric contractions, but were similar in MG for all three muscle contraction types. Collectively, these results highlight an effect of contraction type on beta-band CMC, although it may differ between agonist synergist muscles. These novel findings also provide new evidence that beta-band CMC modulation may involve spinal regulatory mechanisms.

scholarly journals The Influence of Stretching the Hip Flexor Muscles on Performance Parameters. A Systematic Review with Meta-Analysis

2021 ◽  
Vol 18 (4) ◽  
pp. 1936
Author(s):  
Andreas Konrad ◽  
Richard Močnik ◽  
Sylvia Titze ◽  
Masatoshi Nakamura ◽  
Markus Tilp
Keyword(s):  
Systematic Review ◽  
Lumbar Spine ◽  
Positive Impact ◽  
Meta Analysis ◽  
Force Production ◽  
Performance Parameters ◽  
Plantar Flexors ◽  
Performance Change ◽  
Flexor Muscles ◽  
Hip Flexor

The hip flexor muscles are major contributors to lumbar spine stability. Tight hip flexors can lead to pain in the lumbar spine, and hence to an impairment in performance. Moreover, sedentary behavior is a common problem and a major contributor to restricted hip extension flexibility. Stretching can be a tool to reduce muscle tightness and to overcome the aforementioned problems. Therefore, the purpose of this systematic review with meta-analysis was to determine the effects of a single hip flexor stretching exercise on performance parameters. The online search was performed in the following three databases: PubMed, Scopus, and Web of Science. Eight studies were included in this review with a total of 165 subjects (male: 111; female 54). In contrast to other muscle groups (e.g., plantar flexors), where 120 s of stretching likely decreases force production, it seems that isolated hip flexor stretching of up to 120 s has no effect or even a positive impact on performance-related parameters. A comparison of the effects on performance between the three defined stretch durations (30–90 s; 120 s; 270–480 s) revealed a significantly different change in performance (p = 0.02) between the studies with the lowest hip flexor stretch duration (30–90 s; weighted mean performance change: −0.12%; CI (95%): −0.49 to 0.41) and the studies with the highest hip flexor stretch duration (270–480 s; performance change: −3.59%; CI (95%): −5.92 to −2.04). Meta-analysis revealed a significant (but trivial) impairment in the highest hip flexor stretch duration of 270–480 s (SMD effect size = −0.19; CI (95%) −0.379 to 0.000; Z = −1.959; p = 0.05; I2 = 0.62%), but not in the lowest stretch duration (30–90 s). This indicates a dose-response relationship in the hip flexor muscles. Although the evidence is based on a small number of studies, this information will be of great importance for both athletes and coaches.

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