Mechanomyographic amplitude and mean power frequency versus torque relationships during isokinetic and isometric muscle actions of the biceps brachii

2004 ◽  
Vol 14 (5) ◽  
pp. 555-564 ◽  
Author(s):  
Travis W. Beck ◽  
Terry J. Housh ◽  
Glen O. Johnson ◽  
Joseph P. Weir ◽  
Joel T. Cramer ◽  
...  
Keyword(s):  
Biceps Brachii ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Power Frequency ◽  
Muscle Actions ◽  
Isometric Muscle

Gender Comparisons of Mechanomyographic Amplitude and Mean Power Frequency versus Isometric Torque Relationships

2005 ◽  
Vol 21 (1) ◽  
pp. 96-109 ◽  
Author(s):  
Travis W. Beck ◽  
Terry J. Housh ◽  
Glen O. Johnson ◽  
Joseph P. Weir ◽  
Joel T. Cramer ◽  
...  
Keyword(s):  
Biceps Brachii ◽  
Maximum Voluntary Contraction ◽  
Fluid Pressure ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Power Frequency ◽  
Isometric Torque ◽  
Muscle Actions ◽  
Best Fit ◽  
Isometric Muscle

This study compared the patterns of mechanomyographic (MMG) amplitude and mean power frequency vs. torque relationships in men and women during isometric muscle actions of the biceps brachii. Seven men (mean age 23.9 ± 3.5 yrs) and 8 women (mean 21.0 ± 1.3 yrs) performed submaximal to maximal isometric muscle actions of the dominant forearm flexors. Following determination of the isometric maximum voluntary contraction (MVC), they randomly performed submaximal step muscle actions in 10% increments from 10% to 90% MVC. Polynomial regression analyses indicated that the MMG amplitude vs. isometric torque relationship for the men was best fit with a cubic model (R2= 0.983), where MMG amplitude increased slightly from 10% to 20% MVC, increased rapidly from 20% to 80% MVC, and plateaued from 80% to 100% MVC. For the women, MMG amplitude increased linearly (r2= 0.949) from 10% to 100% MVC. Linear models also provided the best fit for the MMG mean power frequency vs. isometric torque relationship in both the men (r2= 0.813) and women (r2= 0.578). The results demonstrated gender differences in the MMG amplitude vs. isometric torque relationship, but similar torque-related patterns for MMG mean power frequency. These findings suggested that the plateau in MMG amplitude at high levels of isometric torque production for the biceps brachii in the men, but not the women, may have been due to greater isometric torque, muscle stiffness, and/or intramuscular fluid pressure in the men, rather than to differences in motor unit activation strategies for modulating isometric torque production.

Reliability of mechanomyographic amplitude and mean power frequency during isometric step and ramp muscle actions

2008 ◽  
Vol 171 (1) ◽  
pp. 104-109 ◽  
Author(s):  
Trent J. Herda ◽  
Eric D. Ryan ◽  
Travis W. Beck ◽  
Pablo B. Costa ◽  
Jason M. DeFreitas ◽  
...  
Keyword(s):  
Mean Power ◽  
Mean Power Frequency ◽  
Power Frequency ◽  
Muscle Actions

Mechanomyographic amplitude and mean power frequency responses during isometric ramp vs. step muscle actions

2008 ◽  
Vol 168 (2) ◽  
pp. 293-305 ◽  
Author(s):  
Eric D. Ryan ◽  
Travis W. Beck ◽  
Trent J. Herda ◽  
Michael J. Hartman ◽  
Jeffrey R. Stout ◽  
...  
Keyword(s):  
Mean Power ◽  
Mean Power Frequency ◽  
Frequency Responses ◽  
Power Frequency ◽  
Muscle Actions

Features for muscle fatigue computed from electromyogram and mechanomyogram: A new one

2016 ◽  
Vol 230 (12) ◽  
pp. 1096-1105 ◽  
Author(s):  
Şükrü Okkesim ◽  
Kezban Coşkun
Keyword(s):  
Muscle Fatigue ◽  
Frequency Ratio ◽  
Biceps Brachii ◽  
Median Frequency ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Power Frequency ◽  
Ratio Change ◽  
The Mean ◽  
New Feature

Muscle fatigue produces negative effects in the performance and it may lead to a muscle failure. This problem makes the quantitative grading of muscle fatigue a necessity in ergonomic and physiological research. Moreover, the quantitative grading of muscle fatigue is needed to increase work and sport productivity and prevent several accidents that result from muscle fatigue. Even though there are many studies for this aim, there is no quantitative criterion for the evaluation of muscle fatigue. The main reason is that muscle fatigue is a complex physiological situation that is dependent on several parameters. Our aim in this study is to present a new feature to evaluate muscle fatigue and prove the reliability of the new feature by making correlation analyses between this with other features. For this aim, electromyography and mechanomyography signals were simultaneously recorded from the biceps brachii and triceps brachii muscles during the isometric and isotonic contractions of 60 healthy volunteers (30 females, 30 males). The mean power frequency and median frequency, which are used in the literature, were compared to the frequency ratio change, the new measure; correlations between the frequency ratio change and the mean power frequency and median frequency were analysed. There was a high correlation between the features, and frequency ratio change can be used to quantitatively evaluate muscle fatigue.

scholarly journals MECHANOMYOGRAPHIC MEAN POWER FREQUENCY AND POWER OUTPUT DURING MAXIMAL, CONCENTRIC ISOKINETIC MUSCLE ACTIONS

2001 ◽  
Vol 33 (5) ◽  
pp. S333
Author(s):  
J T. Cramer ◽  
T J. Housh ◽  
J P. Weir ◽  
K T. Ebersole ◽  
G O. Johnson ◽  
...  
Keyword(s):  
Power Output ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Power Frequency ◽  
Isokinetic Muscle Actions ◽  
Muscle Actions

Effects of muscle kinematics on surface EMG amplitude and frequency during fatiguing dynamic contractions

1997 ◽  
Vol 82 (1) ◽  
pp. 144-151 ◽  
Author(s):  
J. R. Potvin
Keyword(s):  
Biceps Brachii ◽  
Elbow Flexion ◽  
Surface Emg ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Emg Amplitude ◽  
Flexion Extension ◽  
Dynamic Contractions ◽  
Power Frequency ◽  
Voluntary Contractions

Potvin, J. R. Effects of muscle kinematics on surface EMG amplitude and frequency during fatiguing dynamic contractions. J. Appl. Physiol. 82(1): 144–151, 1997.—Fifteen male subjects performed a repetitive elbow flexion/extension task with a 7-kg mass until exhaustion. Average joint angle, angular velocity, and biceps brachii surface electromyographic (EMG) amplitude (aEMG) and mean power frequency (MPF) were calculated with each consecutive 250-ms segment of data during the entire trial. Data were separated into concentric or eccentric phases and into seven 20°-ranges from 0 to 140° of elbow flexion. A regression analysis was used to estimate the rested and fatigued aEMG and MPF values. aEMG values were expressed as a percentage of amplitudes from maximum voluntary contractions (MVC). Under rested dynamic conditions, the average concentric aEMG amplitude was 10% MVC higher than average eccentric values. Rested MPF values were similar for concentric and eccentric phases, although values increased ∼20 Hz from the most extended to flexed joint angles. Fatigue resulted in an average increase in concentric and eccentric aEMG of 35 and 10% MVC, respectively. The largest concentric aEMG increases (up to 58% MVC) were observed at higher joint velocities, whereas eccentric increases appeared to be related to decreases in velocity. Fatigue had a similar effect on MPF during both concentric and eccentric phases. Larger MPF decreases were observed at shorter muscle lengths such that values within each angle range were very similar by the end of the trial. It was hypothesized that this finding may reflect a biological minimum in conduction velocity before propagation failure occurs.

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