Restitution of EMG spectrum after muscular fatigue

1988 ◽  
Vol 57 (3) ◽  
pp. 311-315 ◽  
Author(s):  
Ilkka Kuorinka
Keyword(s):  
Muscular Fatigue ◽  
Emg Spectrum

Evaluation of Muscular Strain and Fatigue in Occupational Field Studies Using Long Term Emg Recordings

2000 ◽  
Vol 44 (26) ◽  
pp. 209-212 ◽  
Author(s):  
Alwin Luttmann ◽  
Matthias Jäger ◽  
Wolfgang Laurig
Keyword(s):  
Time Course ◽  
Field Studies ◽  
Muscular Fatigue ◽  
Joint Analysis ◽  
Detailed Knowledge ◽  
Coding System ◽  
Muscle Strain ◽  
Emg Amplitude ◽  
Power Spectral ◽  
Emg Spectrum

In occupational field studies surface electromyography can be applied to determine muscular strain and to indicate the occurrence of muscular fatigue. Muscle strain is commonly indicated by using the amplitude of the electromyogram (EMG) or measures thereof, muscle strain is indicated by determining the time course of the EMG with respect to changes in the EMG amplitude or power spectral distribution. For both purposes a detailed knowledge on the current activity of the person under test is needed for the total time under investigation. This can be attained by using a special coding system in which an electrical action code is recorded together with the EMG signals. For the indication of muscular fatigue it has to be considered that the EMG amplitude as well as the EMG spectrum depend not only upon the fatigue state but also upon the produced muscle force. Therefore EMGs should only be compared for situations connected with similar muscle load. This demand can be fulfilled (i) by the execution of test contractions of known force in a defined posture, (ii) by comparing the EMG during situations connected with a similar activity or (iii) in a recently developed approach by the joint analysis of EMG amplitude and spectrum (JASA).

Effect of crculatory occlusion on time to muscular fatigue.

1968 ◽  
Vol 24 (1) ◽  
pp. 54-59 ◽  
Author(s):  
S J Myers ◽  
W P Sullivan
Keyword(s):  
Muscular Fatigue

scholarly journals Effects of Prolonged Sitting with Slumped Posture on Trunk Muscular Fatigue in Adolescents with and without Chronic Lower Back Pain

Medicina ◽  
2020 ◽  
Vol 57 (1) ◽  
pp. 3
Author(s):  
Kyoung-Sim Jung ◽  
Jin-Hwa Jung ◽  
Tae-Sung In ◽  
Hwi-Young Cho
Keyword(s):  
Back Pain ◽  
Lower Back Pain ◽  
Transversus Abdominis ◽  
Muscular Fatigue ◽  
Trunk Muscles ◽  
Control Group ◽  
Chronic Lower Back Pain ◽  
Median Frequency ◽  
Prolonged Sitting ◽  
Lower Back

Background and Objectives: This study investigated the effects of prolonged sitting on trunk muscular fatigue and discomfort in participants with and without chronic lower back pain (LBP). Material and Methods: This study included 15 patients with LBP and 15 healthy controls. All participants were instructed to sit on a height-adjustable chair with their knee and hip joints bent at 90° for 30 min, in slumped sitting postures. Surface electromyography was used to assess the median frequency of the internal obliques (IO)/transversus abdominis (TrA) and multifidus (MF) muscles. Perceived discomfort was measured using a Borg category ratio-scale. Median frequency of the trunk muscles and perceived discomfort after 30 min of sitting were compared with baseline. Result: There were no significant differences within the group and between both groups in the median frequency of bilateral IO and MF muscles. The LBP group showed significantly greater perceived discomfort after prolonged sitting, as compared to the control group. Conclusions: Prolonged sitting with slumped posture could increase the risk of experiencing lower back discomfort.

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