01 January 2005
Med Sci Monit 2005; 11(1): CS1-5 :: ID: 13880
Background: A number of studies have evaluated lumbar spinal muscle fatigue using the electromyography (EMG) signal. However, back muscle fatigue studies do not consistently report endurance levels for patients with or without low back pain (LBP). In this case report, we investigated a nonlinear analysis of EMG time series that characterizes their complexity.Material/Methods: A 37-year-old male with chronic LBP and an age- and gender-matched volunteer were compared.The endurance of the erector spinae muscle was determined using a modifi ed version of the isometric Sorensen fatigue test. Nonlinear time series analysis techniques reveal the presence of longrange,power-law correlations. After checking that the signal was stationary, the original time series of 60,000 entries was reduced to 6,000 entries by averaging over 10 consecutive entries.Results: There was a difference between the entropy time dependence exhibited by entropy time dependence exhibited by the healthy subject and the LBP subject. The entropy associated with the LBP subject saturates at very short-times – two orders of magnitude shorter than for the healthy subject.Conclusions: The characterization of the nonlinear time series in this case study provides a consistent measure of back muscle activities. It is important to understand the potential limitations before undertaking an EMG analysis in the fi eld of ergonomics or biomechanics. Further studies are needed to investigate the characteristics of back muscles.
Keywords: Electromyography, Low Back Pain - physiopathology, Lumbosacral Region, Muscle Fatigue, Muscle, Skeletal - physiopathology, Nonlinear Dynamics, Electromyography, Low Back Pain - physiopathology, Lumbosacral Region, Muscle Fatigue, Muscle, Skeletal - physiopathology, Nonlinear Dynamics
01 December 2021 : EditorialEditorial: SARS-CoV-2 Vaccine Responses and Breakthrough COVID-19
Med Sci Monit 2021; 27:e935624
03 December 2021 : Laboratory ResearchInfluenza and Influenza-Like Respiratory Virus Infections in Children During the 2019/20 Influenza Season a...
Med Sci Monit In Press; DOI: 10.12659/MSM.934862
08 November 2021 : Database AnalysisVirtual Screening and Molecular Docking to Study the Mechanism of Chinese Medicines in the Treatment of Cor...
Med Sci Monit In Press; DOI: 10.12659/MSM.934102
01 November 2021 : EditorialEditorial: What Can be Learned from National and International Vaccine Adverse Event Reporting Systems Duri...
Med Sci Monit 2022; 28:e935299
06 Dec 2021 : Animal ResearchAstragalus Flavone Induces Proliferation and Differentiation of Neural Stem Cells in a Cerebral Infarction ...
Med Sci Monit In Press; DOI: 10.12659/MSM.933830
06 Dec 2021 : Clinical ResearchAlteration of Serum Metabolites in Women of Reproductive Age with Chronic Constipation
Med Sci Monit In Press; DOI: 10.12659/MSM.934117
06 Dec 2021 : Clinical ResearchBody Composition Changes and Related Factors in Patients with Ulcerative Colitis: A Retrospective Single-Ce...
Med Sci Monit In Press; DOI: 10.12659/MSM.933942
Most Viewed Current Articles
20 Mar 2020 : Clinical ResearchSocial Capital and Sleep Quality in Individuals Who Self-Isolated for 14 Days During the Coronavirus Diseas...
Med Sci Monit 2020; 26:e923921
15 Apr 2020 : Clinical ResearchPsychological Impact and Coping Strategies of Frontline Medical Staff in Hunan Between January and March 20...
Med Sci Monit 2020; 26:e924171
05 May 2020 : Review articleAn Evidence Based Perspective on mRNA-SARS-CoV-2 Vaccine Development
Med Sci Monit 2020; 26:e924700