Comparison of electromyographic activity during eccentrically versus concentrically loaded isometric contractions

Garner, James W.; Blackburn, J. Troy; Weimar, Wendi H.; Campbell, Brian

doi:10.1016/j.jelekin.2006.11.006

Cited by 23 publications

(45 citation statements)

References 30 publications

(42 reference statements)

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“…Animal and human studies have investigated the supraspinal control of the Renshaw cell and concluded that the activation of the pyramidal tract depresses the Renshaw cell activity leading to lower recurrent inhibition. As previously reported in the literature, the soleus EMG activity did not differ according to the muscle contraction type suggesting that the amount of descending neural drive might be considered as similar for all muscle contraction types in the current study. Therefore, the lack of change in recurrent inhibition between isometric and concentric MVC might be related to this similar muscle activation.…”

Section: Discussionsupporting

confidence: 83%

Recurrent inhibition is higher in eccentric compared to isometric and concentric maximal voluntary contractions

2018

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Section: Discussionsupporting

confidence: 83%

Recurrent inhibition is higher in eccentric compared to isometric and concentric maximal voluntary contractions

2018

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“…The results do not display a statistically relevant difference between both isometric muscle actions concerning their frequency. This was expected based on the findings of other investigators (e.g., [4, 5]), who did not find differences concerning the frequency of the EMG.…”

Section: Discussionsupporting

confidence: 81%

“…So perhaps this could be a link between the proposed isometric muscle actions and the common eccentric and concentric ones. Garner et al [4] also proposed this hypothesis. Furthermore, the study of Grabiner et al [26] showed a higher muscle activation (EMG) if the subject expects a concentric contraction compared to if it anticipates an eccentric one.…”

Section: Discussionmentioning

confidence: 94%

“…Garner et al [4] suggest that two forms of isometric action could exist based on different activity of electromyography (EMG) during concentric and eccentric muscle action. They hypothesize that the eccentrically loaded isometric muscle action (i.e., holding isometric muscle action (HIMA)) shows lower EMG-amplitude than the concentrically loaded one (i.e., pushing isometric muscle action (PIMA)).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the mean amplitude of the whole duration time and the last 10% of duration time as well as the PSD of the MMG/MTG are hypothesized to differ significantly between HIMA and PIMA. Since it has been shown that EMG and MMG can synchronize and are therefore interdependent (e.g., [10, 11]), and furthermore Garner et al [4] as well as Semmler et al [5] did not found differences concerning the frequency of EMG comparing HIMA and PIMA, it is not expected to find differences in the mean frequency of the MMG/MTG either.…”

Section: Introductionmentioning

confidence: 99%

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Are there two forms of isometric muscle action? Results of the experimental study support a distinction between a holding and a pushing isometric muscle function

Schaefer

Bittmann

2017

BMC Sports Sci Med Rehabil

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BackgroundIn isometric muscle function, there are subjectively two different modes of performance: one can either hold isometrically – thus resist an impacting force – or push isometrically – therefore work against a stable resistance. The purpose of this study is to investigate whether or not two different isometric muscle actions – the holding vs. pushing one (HIMA vs PIMA) – can be distinguished by objective parameters.MethodsTen subjects performed two different measuring modes at 80% of MVC realized by a special pneumatic system. During HIMA the subject had to resist the defined impacting force of the pneumatic system in an isometric position, whereby the force of the cylinder works in direction of elbow flexion against the subject. During PIMA the subject worked isometrically in direction of elbow extension against a stable position of the system. The signals of pressure, force, acceleration and mechanomyography/-tendography (MMG/MTG) of the elbow extensor (MMGtri/MTGtri) and the abdominal muscle (MMGobl) were recorded and evaluated concerning the duration of maintaining the force level (force endurance) and the characteristics of MMG-/MTG-signals. Statistical group differences comparing HIMA vs. PIMA were estimated using SPSS.ResultsSignificant differences between HIMA and PIMA were especially apparent regarding the force endurance: During HIMA the subjects showed a decisively shorter time of stable isometric position (19 ± 8 s) in comparison with PIMA (41 ± 24 s; p = .005). In addition, during PIMA the longest isometric plateau amounted to 59.4% of the overall duration time of isometric measuring, during HIMA it lasted 31.6% (p = .000). The frequency of MMG/MTG did not show significant differences. The power in the frequency ranges of 8–15 Hz and 10–29 Hz was significantly higher in the MTGtri performing HIMA compared to PIMA (but not for the MMGs). The amplitude of MMG/MTG did not show any significant difference considering the whole measurement. However, looking only at the last 10% of duration time (exhaustion), the MMGtri showed significantly higher amplitudes during PIMA.ConclusionThe results suggest that under holding isometric conditions muscles exhaust earlier. That means that there are probably two forms of isometric muscle action. We hypothesize two potential reasons for faster yielding during HIMA: (1) earlier metabolic fatigue of the muscle fibers and (2) the complexity of neural control strategies.

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Kinematic and electromyographic analysis of the Nordic Hamstring Exercise

Ditroilo

Vito

Delahunt

2013

Journal of Electromyography and Kinesiology

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Comparison of electromyographic activity during eccentrically versus concentrically loaded isometric contractions

Cited by 23 publications

References 30 publications

Recurrent inhibition is higher in eccentric compared to isometric and concentric maximal voluntary contractions

Recurrent inhibition is higher in eccentric compared to isometric and concentric maximal voluntary contractions

Are there two forms of isometric muscle action? Results of the experimental study support a distinction between a holding and a pushing isometric muscle function

Kinematic and electromyographic analysis of the Nordic Hamstring Exercise

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