A Comparison Of Critical Torque And The Electromyographic Mean Power Frequency Fatigue Threshold During Isometric Leg Extension

2010 ◽  
Vol 24 ◽  
pp. 1
Author(s):  
C Hendrix ◽  
Terry J Housh ◽  
Michelle Mielke ◽  
Clayton L Camic ◽  
Jorge M Zuniga ◽  
...  
Keyword(s):  
Fatigue Threshold ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Leg Extension ◽  
Power Frequency

Interlimb Neuromuscular Responses During Fatiguing, Bilateral, Leg Extension Exercise at a Moderate Versus High Load

Motor Control ◽  
2021 ◽  
Vol 25 (1) ◽  
pp. 59-74
Author(s):  
Taylor K. Dinyer ◽  
Pasquale J. Succi ◽  
M. Travis Byrd ◽  
Caleb C. Voskuil ◽  
Evangeline P. Soucie ◽  
...  
Keyword(s):  
Vastus Lateralis ◽  
High Load ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Leg Extension ◽  
Neuromuscular Responses ◽  
Power Frequency ◽  
The Central Nervous System ◽  
Common Drive ◽  
Repetitions To Failure

This study determined the load- and limb-dependent neuromuscular responses to fatiguing, bilateral, leg extension exercise performed at a moderate (50% one-repetition maximum [1RM]) and high load (80% 1RM). Twelve subjects completed 1RM testing for the bilateral leg extension, followed by repetitions to failure at 50% and 80% 1RM, on separate days. During all visits, the electromyographic (EMG) and mechanomyographic (MMG), amplitude (AMP) and mean power frequency (MPF) signals were recorded from the vastus lateralis of both limbs. There were no limb-dependent responses for any of the neuromuscular signals and no load-dependent responses for EMG AMP, MMG AMP, or MMG MPF (p = .301–.757), but there were main effects for time that indicated increases in EMG and MMG AMP and decreases in MMG MPF. There was a load-dependent decrease in EMG MPF over time (p = .032) that suggested variability in the mechanism responsible for metabolite accumulation at moderate versus high loads. These findings suggested that common drive from the central nervous system was used to modulate force during bilateral leg extension performed at moderate and high loads.

The effect of leg extension training on the mean power frequency of the mechanomyographic signal

2000 ◽  
Vol 23 (6) ◽  
pp. 973-975 ◽  
Author(s):  
Tammy K. Evetovich ◽  
Terry J. Housh ◽  
Joseph P. Weir ◽  
Dona J. Housh ◽  
Glen O. Johnson ◽  
...  
Keyword(s):  
Mean Power ◽  
Mean Power Frequency ◽  
Leg Extension ◽  
Power Frequency ◽  
The Mean

Dependence of the mean power frequency of the electromyogram on muscle force and fibre type

1991 ◽  
Vol 142 (4) ◽  
pp. 457-465 ◽  
Author(s):  
B. GERDLE ◽  
K. HENRIKSSON-LARSÉN ◽  
R. LORENTZON ◽  
M.-L. WRETLING
Keyword(s):  
Fibre Type ◽  
Muscle Force ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Power Frequency ◽  
The Mean

Surface electromyogram power spectrum in human quadriceps muscle during incremental exercise

1993 ◽  
Vol 74 (6) ◽  
pp. 2704-2710 ◽  
Author(s):  
D. Gamet ◽  
J. Duchene ◽  
C. Garapon-Bar ◽  
F. Goubel
Keyword(s):  
Principal Component ◽  
Quadriceps Muscle ◽  
Bicycle Ergometer ◽  
Linear Increase ◽  
Total Power ◽  
Test Surface ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Incremental Test ◽  
Power Frequency

Spectral electromyographic (EMG) changes in human quadriceps muscles were studied to reinvestigate discrepant results concerning mean power frequency (MPF) changes during dynamic exercise. An incremental test consisting of a quasi-linear increase in mechanical power on a bicycle ergometer (for 20–100% of maximal aerobic power) was performed by forty subjects. During this test, surface EMGs from the quadriceps muscles showed that EMG total power (PEMG) increased with a curvilinear pattern for every subject, whereas MPF kinetics varied from one subject to another. PEMG changes had the same shape, which would lead to disappointing results in terms of discrimination between subjects. The ability of normalized MPF kinetics to define significant clusters of subjects was tested using a principal component analysis. This analysis led to the projection of all experiments onto a plane and revealed a relevant grouping of MPF profiles. Differences in MPF kinetics between clusters are interpreted in terms of various possibilities of balance between physiological events leading to an increase or a decrease in MPF.

scholarly journals Inter- and Intra-Individual Differences in EMG and MMG during Maximal, Bilateral, Dynamic Leg Extensions

Sports ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 175 ◽  
Author(s):  
John Paul V. Anders ◽  
Cory M. Smith ◽  
Joshua L. Keller ◽  
Ethan C. Hill ◽  
Terry J. Housh ◽  
...  
Keyword(s):  
Individual Differences ◽  
Repeated Measures ◽  
Polynomial Regression ◽  
Vastus Lateralis ◽  
Regression Analyses ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Leg Extension ◽  
Neuromuscular Responses ◽  
Muscle Actions

The purpose of this study was to compare the composite, inter-individual, and intra-individual differences in the patterns of responses for electromyographic (EMG) and mechanomyographic (MMG) amplitude (AMP) and mean power frequency (MPF) during fatiguing, maximal, bilateral, and isokinetic leg extension muscle actions. Thirteen recreationally active men (age = 21.7 ± 2.6 years; body mass = 79.8 ± 11.5 kg; height = 174.2 ± 12.7 cm) performed maximal, bilateral leg extensions at 180°·s−1 until the torque values dropped to 50% of peak torque for two consecutive repetitions. The EMG and MMG signals from the vastus lateralis (VL) muscles of both limbs were recorded. Four 2(Leg) × 19(time) repeated measures ANOVAs were conducted to examine mean differences for EMG AMP, EMG MPF, MMG AMP, and MMG MPF between limbs, and polynomial regression analyses were performed to identify the patterns of neuromuscular responses. The results indicated no significant differences between limbs for EMG AMP (p = 0.44), EMG MPF (p = 0.33), MMG AMP (p = 0.89), or MMG MPF (p = 0.52). Polynomial regression analyses demonstrated substantial inter-individual variability. Inferences made regarding the patterns of neuromuscular responses to fatiguing and bilateral muscle actions should be considered on a subject-by-subject basis.

Mean power frequency during speech in myalgia patients

2010 ◽  
Vol 37 (9) ◽  
pp. 692-697 ◽  
Author(s):  
E. SUZUKI ◽  
S. ISHIGAKI ◽  
H. YATANI ◽  
E. MORISHIGE ◽  
M. UCHIDA
Keyword(s):  
Mean Power ◽  
Mean Power Frequency ◽  
Power Frequency

THE EFFECT OF FOREARM FLEXION ANGLE ON THE MMG AND EMG MEAN POWER FREQUENCY

2002 ◽  
Vol 34 (5) ◽  
pp. S263
Author(s):  
K T. Ebersole ◽  
T J. Housh ◽  
G O. Johnson ◽  
J T. Cramer ◽  
S R. Perry ◽  
...  
Keyword(s):  
Flexion Angle ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Power Frequency
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