Electrical Activity Of Human Muscle Research Articles

EMG-Based Spasticity Robotic Arm Forupper Arm Fatigue Identification

Electromyogram (EMG) signal reflect the electrical activity of human muscle and contains information about the structure of muscle. Furthermore, motor unit action potential (MUAP) is the results from spatial and temporal summation of difference muscle fibers of a single motor. The EMG signal results, in turn is from the summation of different MUAPs which are sufficiently near the recording electrode. EMG signal can identify the differences between signals from bicep, triceps and forearms during exercise. Raw data from the experiment is vital to assist physiotherapy to understand when the subject fatigue of noise high pick signal during rehabilitation. Several normal subjects were selected to perform experiments to understand the pattern of fatigue in early state, middle stage and last stage of exercises.

Effect of eccentric and concentric muscle conditioning on tension and electrical activity of human muscle.

The effects of seven weeks of eccentric or concentric muscle conditioning on muscle tension and. integrated electrical activity (IEMG) were investigated on human subjects by using a special electrical dynamometer as a testing and training apparatus. The eccentric conditioning caused, on the average, a greater improvement in muscle tension than did the concentric conditioning. In early conditioning those in the eccentric group experienced soreness in their exercised muscles. This caused a concomitant drop in maximum strength. After the disappearance of pain symptoms, ability to develop tension increased in a linear fashion. Neither method was able to cause statistically significant changes in the maximum IEMG associated with any type of muscle contraction. The regression lino expressing the relationship between IEMG ( μ.v. per sec.) and isometric tension (in percent of maximal voluntary contraction) was parabolic. In this relationship muscle conditioning failed to cause any significant changes in IEMG per ...

Correlation analysis of electrical activity of human muscles of respiration

Correlation analysis of electrical activity of human muscles of respiration

Effect of eccentric training of agonists on antagonistic muscles.

ArticleEffect of eccentric training of agonists on antagonistic muscles.M Singh, and P V KarpovichM Singh, and P V KarpovichPublished Online:01 Nov 1967https://doi.org/10.1152/jappl.1967.23.5.742MoreSectionsPDF (778 KB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformation Cited ByHistory of Strength Training Research in Man: An Inventory and Quantitative Overview of Studies Published in English Between 1894 and 197924 February 2021 | Journal of Strength and Conditioning Research, Vol. 35, No. 5Principi del rinforzo muscolare: applicazioni negli atleti in riabilitazioneEMC - Medicina Riabilitativa, Vol. 24, No. 3Principios del fortalecimiento muscular: aplicaciones en el deportista en rehabilitaciónEMC - Kinesiterapia - Medicina Física, Vol. 38, No. 3Le travail musculaire excentrique : intérêts dans la prise en charge thérapeutique du sportifAnnales de Réadaptation et de Médecine Physique, Vol. 47, No. 6Terminology for contractions of muscles during shortening, while isometric, and during lengtheningJohn A. Faulkner1 August 2003 | Journal of Applied Physiology, Vol. 95, No. 2Positive (Concentric) and negative (Eccentric) muscular activity: A review8 July 2009 | Sports Medicine, Training and Rehabilitation, Vol. 6, No. 2Cocontraction changes in muscular fatigue at different levels of isometric contractionInternational Journal of Industrial Ergonomics, Vol. 9, No. 4Velocity-Specific and Mode-Specific Effects of Eccentric Isokinetic Training of the HamstringsJournal of Orthopaedic & Sports Physical Therapy, Vol. 13, No. 1Effects of eccentric and concentric muscle actions in resistance trainingActa Physiologica Scandinavica, Vol. 140, No. 1A dynamometric comparison of maximum eccentric, concentric, and isometric contractions using EMG and energy expenditure measurementsEuropean Journal of Applied Physiology and Occupational Physiology, Vol. 45, No. 2-3A Prototype Instrument for Monitoring Muscular Effort1 December 2016 | Engineering in Medicine, Vol. 5, No. 2Adaptive Effects of Static Muscular Strength Training21 November 2016 | Proceedings of the Human Factors Society Annual Meeting, Vol. 19, No. 4Effect of Eccentric and Concentric Muscle Conditioning on Tension and Electrical Activity of Human Muscle*Ergonomics, Vol. 15, No. 4Adaptation of trained athletes' energy expenditure to repeated concentric and eccentric muscle contractionsInternationale Zeitschrift für Angewandte Physiologie Einschliesslich Arbeitsphysiologie, Vol. 26, No. 3 More from this issue > Volume 23Issue 5November 1967Pages 742-5 https://doi.org/10.1152/jappl.1967.23.5.742PubMed6061389History Published online 1 November 1967 Published in print 1 November 1967 Metrics

Spontaneous electrical activity of human muscle

The spontaneous electrical activity of human muscle was studied in 197 normals, 67 patients with peripheral nerve involvement and 29 patients with progressive muscular dystrophy. “Noise” was observed in the end-plate zones of normal muscle; after minute displacements of the electrode the noise could be seen to consist of randomly occurring purely negative discharges 0.5–2 msec in duration and up to 100 μV in amplitude. This activity probably represents extracellularly recorded miniature end-plate potentials. Outside the end-plate zones of normal muscle a single site was rarely encountered yielding a spontaneous discharge similar to the fibrillation potentials of denervated muscle. In normal muscle such a discharge may correspond to the propagated disphasic potentials superimposed on the “end-plate noise”. The fibrillation potentials in patients with lower motor neurone disease were found to have longer durations than usually stated (1–5 msec as compared with 0.5–2 msec), a significant proportion of triphasic potentials (30%) and voltages half of which were of the same order (100–300 μV) as those of motor unit potentials. The fibrillations found in 29 of 76 patients with progressive muscular dystrophy had the same average duration, amplitude and shape as in denervated muscles. The fibrillation potentials were initiated in the end-plate zone as evidenced by the initial negative deflection of the potential recorded there and the initial positive deflection outside the end-plate zone. The initiation of the fibrillation potentials cannot be ascribed to mechanical stimulation by the intramuscular needle electrode since fibrillation potentials could also be recorded subcutaneously. With the 50 μ diameter leads of a multi-electrode fibrillation potentials were recorded with peak-to-peak amplitudes as high as 8.5 mV. The decline in amplitude along the multi-lead electrode was the same for fibrillation potentials 1 mV or more in amplitude as for the spike components of motor unit potentials, the voltage falling to less than one-tenth of maximum within 0.45 mm. This suggests that “high voltage” fibrillation potentials represent the spontaneous discharge of a sub-unit. The amplitudes of 100–600 μV fibrillation potentials declined relatively less with distance, suggesting that they were recorded farther away from the generators (about 0.5 mm) than the high voltage potentials. The small amplitude and rapid attenuation of positive sharp waves suggest that they are derived from a single muscle fibre. Cross talk in our multi-lead electrodes was insignificant and cannot explain the discrepancy between our findings and those of other investigators with regard to the voltage decline of spike potentials. The cause of fibrillation potentials is discussed in the light of the present knowledge of the properties of the membrane of denervated muscle fibres.