Evolution in impedance at the electrode-skin interface of two types of surface EMG electrodes during long-term recordings

Hewson, David J.; Hogrel, Jean‐Yves; Langeron, Yves; Duchêne, Jacques

doi:10.1016/s1050-6411(02)00097-4

Cited by 75 publications

(55 citation statements)

References 12 publications

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“…Electrode-skin impedance was reduced below 55 k (Hewson et al 2003) using standard skin preparation procedures (i.e., shaving, slight abrasion and cleaning with an alcohol-acetone solution). According to the "Surface Electromyography for the Non-Invasive Assessment of Muscles" recommendations (Hermens et al 2000), surface EMG sensors were placed between the distal tendon and the innervation's zone with respect to the assumed direction of muscle Wbers.…”

Section: Electromyographymentioning

confidence: 99%

Neuromuscular adaptations to 8-week strength training: isotonic versus isokinetic mode

2009

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Previous studies attempted to compare the effectiveness of isokinetic and isotonic training. However, they have provided conflicting results. The purpose of this study was to compare the effects of isotonic versus isokinetic standardized concentric strength training programs of the knee extensors on the neuromuscular system. The standardization of these two training programs was ensured by the equalization of the total external amount of work performed and the mean angular movement velocity. Thirty healthy male students were randomly assigned to the isotonic (IT; n = 11), the isokinetic (IK; n = 11) or the control (C; n = 8) group. Both IT and IK groups trained their dominant lower leg 3 sessions/week for 8 weeks on a dynamometer. The IT group exercised using a preset torque of 40% of the maximal voluntary isometric torque at 70 degrees (0 degrees = leg in horizontal position). The IK group exercised at a velocity ranging between 150 degrees and 180 degrees s(-1). Isotonic, isokinetic and isometric tests were performed on a dynamometer before and after strength training. Surface electromyographic activity of vastus lateralis, vastus medialis, rectus femoris, semitendinosus and biceps femoris muscles was recorded during the tests. Significant strength increases in both dynamic and static conditions were noticed for IT and IK groups without any significant difference between the two trained groups. Agonist muscle activity also increased with training but no change in antagonist muscle co-activity was observed. The two training methods could be proposed by clinicians and athletic coaches to improve concentric muscle strength in dynamic and static conditions.

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Section: Electromyographymentioning

confidence: 99%

Neuromuscular adaptations to 8-week strength training: isotonic versus isokinetic mode

2009

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“…Laboratory tests (BOTTIN and REBECCHI, 2002) demonstrated the reliability and stability of the electrode-skin contact over a period of 2h, with a repeatable contact impedance (measured at 20 Hz with 4 ~tARMs test current) decreasing from an initial value (mean+ standard error) of 180-4-15k~Q shortly after application, to a value of 60 -4-20 k~ after 2 h. A dry silver bar electrode array, tested in the same conditions for comparison, showed a much less consistent and reliable behaviour, with values of 320-4-90 k~Q after application and 617-4-120kf~ after 2h. This performance is similar to other types of commercially available electrode for bipolar EMG using a similar 'recessed electrode' technology (HEWSON et al, 2003). The adhesive arrays were also advantageously used in experimental protocols during cycling at 60 revolutions min -1 for 4 min and during explosive contractions , providing negligible movement artifact and consistent performance over time.…”

Section: Resultsmentioning

confidence: 56%

Sixty-four channel wearable acquisition system for long-term surface electromyogram recording with electrode arrays

Pozzo

Bottin

Ferrabone

et al. 2004

Med. Biol. Eng. Comput.

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The use of mono- and bi-dimensional electromyogram (EMG) electrode arrays for the assessment of the neuromuscular system can provide an insight into muscle physiology not achieved with classical bipolar surface EMG. Among the advantages of multichannel EMG detection, there is a) the possibility of estimating muscle fibre conduction velocity, even during motor tasks, and b) the possibility to increase the number of detection points on a muscle, improving the performance of pattern-based EMG decomposition methods. For these reasons, the development and use of multichannel surface EMG devices and techniques were chosen as the primary goals within the European RTD Project 'Neuromuscular assessment in the elderly worker' (NEW). The specific requirements of Project NEW called for the availability of a user-friendly, small-sized EMG acquisition system for field use, suitable for multichannel EMG recording using electrode arrays from one or more muscles. A market survey established that none of the commercially available EMG acquisition systems featured all the desired specifications, nor could they be easily adapted for specific use. The paper describes the design of an innovative acquisition system for long-term multichannel EMG recording fulfilling these requirements and comprising adhesive electrode arrays for artifact-free EMG acquisition during work activity and a portable, user-friendly, battery-powered acquisition system for multichannel EMG recording and storage on a removable PCMCIA card. The system has been used extensively within Project NEW for laboratory and field tests and can find applications in other fields of basic and applied research, including ergonomics, occupational and sports medicine.

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“…Methods for evaluating clinical electrodes have been developed throughout the years [3,29,42]. There have also emerged some studies on how to evaluate textile electrodes.…”

Section: Electrodesmentioning

confidence: 99%

Smartware electrodes for ECG measurements : Design, evaluation and signal processing

Rattfält¹

2013

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Printed in Sweden by LiU-Tryck, Linköping During the course of the research underlying this thesis, Linda Rattfält was enrolled in Forum Scientium, a multidisciplinary doctoral programme at Linköping University, Sweden.i Håll koll på hjärtat med smarta EKG-elektroderBefolkningen i västvärlden blir allt äldre och i samband med detta ökar även andelen av åldersrelaterade sjukdomar. Dessa åkommor står redan för en stor del av hälso-och sjukvårdsresurserna och därför har man nationellt och internationellt efterfrågat alternativa strategier för att kunna tillgodose det kommande vårdbe-hovet på ett kostnadseffektivt sätt. En av strategierna är att med hjälp av använ-darvänlig mätutrustning hemifrån kunna följa upp tex hjärtåkommor så att de kan behandlas innan tillståndet eventuellt blir akut.Den här avhandlingen berör forskning som syftar till att skapa en tillförlitlig mät-metod av hur hjärtat arbetar, varhelst personen befinner sig, med hjälp av smarta elektroder. Speciellt berörs hur de smarta elektrodernas prestanda är i jämförelse med konventionella elektroder som används inom vården samt hur man kan använda signalbehandling för att förbättra mätkvaliteten.Hjärtats elektriska aktivitet kan mätas med ett så kallat elektrokardiogram, EKG, genom att fästa två eller fler elektroder på kroppen och koppla dessa till ett mät-system. Vanligtvis används elektroder med klisterlappar som placeras på exakta platser på kroppen. Den här typen av mätning är välspridd och anses viktig inom vården, men lämpar sig inte för hemmabruk eftersom elektrodförberedelser och placering inte kan säkerställas. Istället föreslår vi att man kan använda smarta elektroder, tex gjorda av textil eller i form av screentryck. Elektroderna skulle sedan kunna användas i mer användarvänliga sensorer, tex i linningar på kläder eller i form av en gjördel som man tar på sig vid mättillfället. De smarta elektrodernas egenskaper spelar stor roll då man mäter ett EKG. Om man använder fel material eller utförande, kan elektroden i sig skapa störningar som förstör mät-ningarna. Därför har vi testat hur de alternativa elektroderna fungerar jämfört mot vanliga elektroder som används idag. Våra tester visar att flera av de smarta elektroder vi testat är nästan lika stabila som vanliga elektroder. Dock medför de smarta elektroderna ofta ett större motstånd, så kallad impedans, för signalen att ta sig igenom till själva mätsystemet, något som är viktigt att tänka på när mätsystemet utformas.Förutom att göra användarvänliga sensorer av smarta elektroder, anser vi att man kan minska graden av störningar genom att man samlar in flera signaler samtidigt och väger samman dem till en förhoppningsvis mer tillförlitlig signal. Detta kan göras på många sätt och två sätt presenteras i avhandlingen. Det första sättet använder statistik för att urskilja olika delsignaler i den inspelade signalen. På det här sättet kan man få en delsignal som avspeglar hjärtats aktivitet och en annan som exempelvis innehåller brus. Vid en jämförelse mot två andra metoder fick vi att vår met...

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Evolution in impedance at the electrode-skin interface of two types of surface EMG electrodes during long-term recordings

Cited by 75 publications

References 12 publications

Neuromuscular adaptations to 8-week strength training: isotonic versus isokinetic mode

Neuromuscular adaptations to 8-week strength training: isotonic versus isokinetic mode

Sixty-four channel wearable acquisition system for long-term surface electromyogram recording with electrode arrays

Smartware electrodes for ECG measurements : Design, evaluation and signal processing

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