Sensitivity and stability analysis of sEMG indices in evaluating muscle fatigue of Rectus Femoris caused by all-out cycling exercise

2011 ◽  
Author(s):  
Lejun Wang ◽  
Yong Huang ◽  
Mingxin Gong ◽  
Guoqiang Ma
Keyword(s):  
Stability Analysis ◽  
Muscle Fatigue ◽  
Rectus Femoris ◽  
Cycling Exercise ◽  
Sensitivity And Stability Analysis

scholarly journals Implementation of a Portable Electromyographic Prototype for the Detection of Muscle Fatigue

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 619 ◽  
Author(s):  
Sandra De la Peña ◽  
Aura Polo ◽  
Carlos Robles-Algarín
Keyword(s):  
Muscle Fatigue ◽  
Muscular Strength ◽  
Vastus Lateralis ◽  
Rectus Femoris ◽  
Skin Surface ◽  
Mean Frequency ◽  
Signal Characteristics ◽  
Dynamic Contractions ◽  
Experienced Fatigue ◽  
Two Parameters

Surface electromyography (sEMG) applied to the sports training area makes possible the observation of fatigue as well as the generation of muscular strength, through the study of changes in signal characteristics, such as peak-to-peak amplitude, mean frequency and median, among others. In this sense, this work presents the design of a portable prototype for the acquisition and processing of electromyographic (EMG) signals aimed at the detection of muscle fatigue in athletes. Using two Bluetooth Bee modules, a wireless communication was performed in order to send the muscular electrical activity of the skin surface to a user interface developed in LabVIEW. A group of players from the Volleyball team of the Universidad del Magdalena, performed a series of exercise routines with dynamic contractions and as they experienced fatigue, samples were taken of the contractions made. The tests were performed on the vastus lateralis and rectus femoris muscles. The analysis of fatigue under dynamic conditions of the two parameters studied, in frequency and time, showed that it is more pertinent to estimate fatigue indices in the frequency domain.

The frequency of alternate muscle activity is associated with the attenuation in muscle fatigue

2006 ◽  
Vol 101 (3) ◽  
pp. 715-720 ◽  
Author(s):  
Motoki Kouzaki ◽  
Minoru Shinohara
Keyword(s):  
Muscle Fatigue ◽  
Muscle Activity ◽  
Healthy Subjects ◽  
Vastus Lateralis ◽  
Rectus Femoris ◽  
Knee Extension ◽  
Voluntary Contraction ◽  
Sustained Contraction ◽  
Low Level ◽  
Before And After

Alternate muscle activity between synergist muscles has been demonstrated during low-level sustained contractions [≤5% of maximal voluntary contraction (MVC) force]. To determine the functional significance of the alternate muscle activity, the association between the frequency of alternate muscle activity during a low-level sustained knee extension and the reduction in knee extension MVC force was studied. Forty-one healthy subjects performed a sustained knee extension at 2.5% MVC force for 1 h. Before and after the sustained knee extension, MVC force was measured. The surface electromyogram was recorded from the rectus femoris (RF), vastus lateralis (VL), and vastus medialis (VM) muscles. The frequency of alternate muscle activity for RF-VL, RF-VM, and VL-VM pairs was determined during the sustained contraction. The frequency of alternate muscle activity ranged from 4 to 11 times/h for RF-VL (7.0 ± 2.0 times/h) and RF-VM (7.0 ± 1.9 times/h) pairs, but it was only 0 to 2 times/h for the VL-VM pair (0.5 ± 0.7 times/h). MVC force after the sustained contraction decreased by 14% ( P < 0.01) from 573.6 ± 145.2 N to 483.3 ± 130.5 N. The amount of reduction in MVC force was negatively correlated with the frequency of alternate muscle activity for the RF-VL and RF-VM pairs ( P < 0.001 and r = 0.65 for both) but not for the VL-VM pair. The results demonstrate that subjects with more frequent alternate muscle activity experience less muscle fatigue. We conclude that the alternate muscle activity between synergist muscles attenuates muscle fatigue.

Sensitivity and stability analysis in data envelopment analysis

2005 ◽  
Vol 56 (3) ◽  
pp. 342-345 ◽  
Author(s):  
G R Jahanshahloo ◽  
F Hosseinzadeh ◽  
N Shoja ◽  
M Sanei ◽  
G Tohidi
Keyword(s):  
Data Envelopment Analysis ◽  
Stability Analysis ◽  
Data Envelopment ◽  
Sensitivity And Stability Analysis

Sensitivity and stability analysis in DEA with interval data

2004 ◽  
Vol 156 (2) ◽  
pp. 463-477 ◽  
Author(s):  
G.R Jahanshahloo ◽  
F Hosseinzadeh Lofti ◽  
M Moradi
Keyword(s):  
Stability Analysis ◽  
Interval Data ◽  
Sensitivity And Stability Analysis

Sensitivity and stability analysis in dea

1984 ◽  
Vol 2 (1) ◽  
pp. 139-156 ◽  
Author(s):  
A. Charnes ◽  
W. W. Cooper ◽  
A. Y. Lewin ◽  
R. C. Morey ◽  
J. Rousseau
Keyword(s):  
Stability Analysis ◽  
Sensitivity And Stability Analysis

scholarly journals A Comparative Study of EMG Indices in Muscle Fatigue Evaluation Based on Grey Relational Analysis during All-Out Cycling Exercise

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Lejun Wang ◽  
Yuting Wang ◽  
Aidi Ma ◽  
Guoqiang Ma ◽  
Yu Ye ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Power Output ◽  
Vastus Lateralis ◽  
Wavelet Packet ◽  
Vastus Lateralis Muscle ◽  
Cycling Exercise ◽  
Warm Up ◽  
Wavelet Packet Transformation ◽  
Fatigue Evaluation ◽  
Grey Relational

The increased popularization of cycling has brought an increase in cycling-related injuries, which has been suggested to be associated with muscle fatigue. However, it still remains unclear on the utility of different EMG indices in muscle fatigue evaluation induced by cycling exercise. In this study, ten cyclist volunteers performed a 30-second all-out cycling exercise after a warm-up period. Surface electromyography (sEMG) from vastus lateralis muscle (VL) and power output and cadence were recorded and EMG RMS, MF and MPF based on Fourier Transform, MDF and MNF based on wavelet packet transformation, and C(n) based on Lempel–Ziv complexity algorithm were calculated. Utility of the indices was compared based on the grey rational grade of sEMG indices and power output and cadence. The results suggested that MNF derived from wavelet packet transformation was significantly higher than other EMG indices, indicating the potential application for fatigue evaluation induced by all-out cycling exercise.

scholarly journals Muscle Fatigue Revisited – Insights From Optically Pumped Magnetometers

2021 ◽  
Vol 12 ◽  
Author(s):  
Davide Sometti ◽  
Lorenzo Semeia ◽  
Sangyeob Baek ◽  
Hui Chen ◽  
Giulia Righetti ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Rectus Femoris ◽  
Field Vector ◽  
Optically Pumped ◽  
Potential Alternative ◽  
Spectral Compression ◽  
Rectus Femoris Muscle ◽  
The Magnetic Field ◽  
Healthy Participants ◽  
Femoris Muscle

So far, surface electromyography (sEMG) has been the method of choice to detect and evaluate muscle fatigue. However, recent advancements in non-cryogenic quantum sensors, such as optically pumped magnetometers (OPMs), enable interesting possibilities to flexibly record biomagnetic signals. Yet, a magnetomyographic investigation of muscular fatigue is still missing. Here, we simultaneously used sEMG (4 surface electrode) and OPM-based magnetomyography (OPM-MMG, 4 sensors) to detect muscle fatigue during a 3 × 1-min isometric contractions of the left rectus femoris muscle in 7 healthy participants. Both signals exhibited the characteristic spectral compression distinctive for muscle fatigue. OPM-MMG and sEMG slope values, used to quantify the spectral compression of the signals, were positively correlated, displaying similarity between the techniques. Additionally, the analysis of the different components of the magnetic field vector enabled speculations regarding the propagation of the muscle action potentials (MAPs). Altogether these results show the feasibility of the magnetomyographic approach with OPMs and propose a potential alternative to sEMG for the study of muscle fatigue.

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