scholarly journals Implications of Variability of Electromyographic Measurements for Assessing Localized Muscle Fatigue

2020 ◽  
Author(s):  
Hamad Nasser Alasim
Keyword(s):  
Muscle Fatigue ◽  
Localized Muscle Fatigue

Effect of localized muscle fatigue induced at different joints on postural control

2005 ◽  
Author(s):  
Navrag B. Singh ◽  
Maury A. Nussbaum ◽  
Dingding Lin ◽  
Michael L. Madigan
Keyword(s):  
Postural Control ◽  
Muscle Fatigue ◽  
Localized Muscle Fatigue

scholarly journals Sex-specific Effects of Localized Muscle Fatigue on Upper Body Kinematics During a Repetitive Pointing Task

2021 ◽  
Author(s):  
Chen Yang ◽  
Julie N. Côté
Keyword(s):  
Muscle Fatigue ◽  
Musculoskeletal Disorders ◽  
Movement Pattern ◽  
Upper Body ◽  
Lateral Flexion ◽  
Joint Angles ◽  
Localized Muscle Fatigue ◽  
Specific Effects ◽  
Spinal Movement ◽  
Pointing Task

Abstract BackgroundFemales are reported to have a higher risk of musculoskeletal disorders than males. Among risk factors for musculoskeletal disorders, the mechanism of muscle fatigue remains unclear. Especially how females and males adapt to localized fatigue is poorly understood. The purpose of the study was to examine the sex-specific effects of fatigue location on shoulder, elbow and spinal joint angles, and angular variabilities during a repetitive pointing task.MethodsSeven males and ten females performed a standing repetitive pointing task when they were non-fatigued (NF), elbow-fatigued (EF), shoulder-fatigued (SF) and trunk-fatigued (TF), while trunk and upper body tridimensional kinematic data was recorded. Joint angles and angular variabilities of shoulder, elbow, upper thorax, lower thorax, and lumbar were calculated. ResultsResults showed that shoulder angles changed the most after EF in males, but after SF in females. The similarities between sexes were that SF increased the variabilities at upper (lateral flexion: 0.15° greater than NF, rotation: 0.26° greater than all other conditions) and lower thorax (lateral flexion: 0.13° greater than NF, rotation: averagely 0.1° greater than all other condition) in both sexes. TF altered upper thorax variability (0.36° smaller than SF), lower thorax angle (lateral flexion: 3.00° greater than NF, rotation: 1.68° greater than SF), and lumbar angle (averagely 1.8° smaller than all other conditions) in both sexes. However, females had greater lower thorax angle (lateral flexion: 8.3° greater, p=0.005) as well as greater upper (rotation: 0.53° greater, p=0.006) and lower thorax (rotation: 0.5° greater, p=0.007; flexion: 0.6° greater, p=0.014) angular variabilities.ConclusionsThe overall greater lower and upper thorax angular variabilities suggested a more unstable spinal movement pattern in females. The kinematic differences between sexes highlighted a few sex differences in adapting the localized muscle fatigue.

An electromyographic index for localized muscle fatigue

1977 ◽  
Vol 43 (4) ◽  
pp. 750-754 ◽  
Author(s):  
L. Lindstrom ◽  
R. Kadefors ◽  
I. Petersen
Keyword(s):  
Power Spectrum ◽  
Muscle Fatigue ◽  
Power Spectrum Analysis ◽  
Muscle Action ◽  
Localized Muscle Fatigue ◽  
Fatigue Development ◽  
Fatigued Muscle ◽  
Muscle Action Potential ◽  
Velocity Changes ◽  
Objective Quantification

A new method for objective quantification of localized muscle fatigue is described. The method is based on power spectrum analysis of myoelectric signals obtained from the fatigued muscle. It permits real-time investigations and yields statistically based criteria for the occurrence of fatigue. The findings are interpreted in terms of muscle action potential conduction velocity changes and rate of the fatigue development.

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