Intensity-dependent EMG response for the biceps brachii during sustained maximal and submaximal isometric contractions

Carr, Joshua C.; Beck, Travis W.; Ye, Xin; Wages, Nathan P.

doi:10.1007/s00421-016-3435-6

Cited by 11 publications

(18 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…; Carr et al. ). Interestingly, for both tasks performed by the women, the task failure times were exclusively predicted by the rate of change in the antagonist MNF.…”

Section: Discussionmentioning

confidence: 99%

“…; Carr et al. ) have used the rate of change in the EMG parameters to predict task failure time. For example, Booghs et al.…”

Section: Introductionmentioning

confidence: 99%

“…); and the changes in EMG MNF can be used to predict time to failure during a medium‐intensity isometric elbow flexion fatiguing contraction (60% MVIC) (Carr et al. ). Interestingly, whether the rate of change in the antagonist muscle EMG MNF can contribute significantly to the task failure time during a sustained isometric contraction has rarely been examined.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, researchers (Merletti and Roy 1996;Troiano et al 2008;Rudroff et al 2011;Booghs et al 2012;Beck et al 2015;Carr et al 2016) have used the rate of change in the EMG parameters to predict task failure time. For example, Booghs et al (2012) reported the rate of changes in different muscles' EMG amplitude as the best predictor for the elbow flexion task failure time during low and high contraction intensities.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Booghs et al (2012) reported the rate of changes in different muscles' EMG amplitude as the best predictor for the elbow flexion task failure time during low and high contraction intensities. In addition, it has also been shown that the task failure time was highly correlated to both the decrement in high-frequency spectral power and the increment in low-frequency spectral power of the EMG signals (Beck et al 2015); and the changes in EMG MNF can be used to predict time to failure during a medium-intensity isometric elbow flexion fatiguing contraction (60% MVIC) (Carr et al 2016). Interestingly, whether the rate of change in the antagonist muscle EMG MNF can contribute significantly to the task failure time during a sustained isometric contraction has rarely been examined.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Sex comparisons of agonist and antagonist muscle electromyographic parameters during two different submaximal isometric fatiguing tasks

Jeon

Miller

2019

Physiol Rep

Self Cite

View full text Add to dashboard Cite

To examine the task failure time of the force‐ and position‐based submaximal elbow flexion fatiguing tasks for both sexes, twelve men and eight women visited the laboratory for two separate experimental occasions. During the experiment, they pulled against a rigid restraint for the force task and maintained a constant elbow joint angle to support an equivalent inertial load for the position task. For both fatiguing tasks (50% of the isometric strength at the elbow joint angle of 135 degree), the task failure time, along with the surface electromyographic ( EMG ) amplitude and mean frequency ( MNF ) were measured. The average failure time was longer for the force task than that for the position task (sexes combined: 39.6 ± 16.6 sec vs. 33.9 ± 14.9 sec, P = 0.033). In addition, men were overall less fatigable than women (tasks combined: 42.0 ± 14.7 sec vs. 28.7 ± 10.3 sec, P = 0.020). The multiple regression analyses showed that the task failure time in women was solely predicted by the rate of change of the triceps EMG MNF . Thus, more fatigability of women in this study was likely due to the quicker fatiguing rate of the antagonist triceps brachii muscle. Different from most previous studies that have used 90‐degree elbow joint angle, the current 135‐degree joint angle setup might have created a situation where greater muscle activity from the related muscles (e.g., the antagonist) were required for women than for men to stabilize the joint, thereby resulting in a shorter task failure time.

show abstract

“…; Carr et al. ). Interestingly, for both tasks performed by the women, the task failure times were exclusively predicted by the rate of change in the antagonist MNF.…”

Section: Discussionmentioning

confidence: 99%

“…; Carr et al. ) have used the rate of change in the EMG parameters to predict task failure time. For example, Booghs et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Sex comparisons of agonist and antagonist muscle electromyographic parameters during two different submaximal isometric fatiguing tasks

Jeon

Miller

2019

Physiol Rep

Self Cite

View full text Add to dashboard Cite

show abstract

Biceps Brachii Muscle Length Affects Force Steadiness with and Without Fatigue

Carr

Tharp

2021

J. of SCI. IN SPORT AND EXERCISE

Self Cite

View full text Add to dashboard Cite

Purpose The purpose of this study was to examine the influence of muscle length and fatigue on maximal force, submaximal force steadiness, and electromyographic (EMG) activity of the biceps brachii. Methods Force and EMG responses were measured before and after a fatigue protocol consisting of maximal intermittent contractions of the elbow flexors until task failure (n = 20). The protocol was performed on two separate occasions in a randomized order. During one visit, the elbow joint was at 90° (EF 90 ) and for the other, it was extended to 120° (EF 120 ). ResultsThe results show a large effect size for greater force loss following fatigue at long muscle length (P = 0.067, 2 p = 0.166). The fatigue-based decreases in force steadiness were not different between muscle lengths (P = 0.502, 2 p = 0.024). Force steadiness was lower at long muscle length before and after fatigue (P < 0.01, d = 0.691). Following fatigue, muscle excitation decreased and increased during maximal and submaximal force tasks, respectively, yet there were no lengthdependent EMG responses. Conclusions The novel findings show fatigue at long muscle length likely affects force loss to a greater degree than fatiguebased decreases in force steadiness. These data show lower elbow flexion force steadiness when the biceps brachii is in a lengthened position.

show abstract

Differentiating maximal and submaximal voluntary strength measures for the purposes of medico‐legal assessments and para sport classification: A systematic review

Paix

Tweedy

Connick

et al. 2020

European Journal of Sport Science

View full text Add to dashboard Cite

Measurement of maximum voluntary muscle contractions are effort-dependentvalid measurement requires maximal voluntary effort (MVE) from participants. Submaximal efforts (SMEs) yield invalid and potentially misleading results. This is particularly problematic in medico-legal and Para sport assessments where low strength scores may confer a personal advantage. Therefore, objective methods for accurately differentiating MVE and SME are required. This systematic review aimed to identify, appraise and synthesise evidence from scientific studies evaluating the validity of objective methods for differentiating MVE from SME during maximal voluntary contractions. Four electronic databases were searched for original research articles published in English and secondary references appraised for relevance yielding 25 studies for review. Methods were categorised based on eight distinct underlying theories. For isokinetic strength assessment, methods based on two theories -Strength-measure Ratios and Inter-Trial Strength Consistencycorrectly classified 100% MVE and > 92% SME. Consequently, research evaluating the relative suitability of these methods for translation into practice is warranted. During isometric strength assessments, methods based on Deceptive Visual Feedback and Force-length properties warrant further investigation. Both methods yielded statistically significant differences between MVE and SME, with minimal overlap in values, but their sensitivity and specificity have not been evaluated.

show abstract

Intensity-dependent EMG response for the biceps brachii during sustained maximal and submaximal isometric contractions

Abstract: The patterns of EMG response emphasize the basis of neuromuscular fatigue and task dependency. Additionally, our data suggest that the EMG MNF should be used when monitoring the progression of local muscle fatigue.

Cited by 11 publications

References 42 publications

Sex comparisons of agonist and antagonist muscle electromyographic parameters during two different submaximal isometric fatiguing tasks

Sex comparisons of agonist and antagonist muscle electromyographic parameters during two different submaximal isometric fatiguing tasks

Biceps Brachii Muscle Length Affects Force Steadiness with and Without Fatigue

Differentiating maximal and submaximal voluntary strength measures for the purposes of medico‐legal assessments and para sport classification: A systematic review

Contact Info

Product

Resources

About