The propagation of motor unit action potential and the location of neuromuscular junction investigated by surface electrode arrays

Masuda, Tadashi; Miyano, Hisao; Sadoyama, Tsugutake

doi:10.1016/0013-4694(83)90171-2

Cited by 59 publications

(35 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mean (MNF) or median (MDF) frequency of the PSD was shown to shift to lower frequencies during increasing fatigue (De Luca 1979;Lindstrom and Magnusson 1977;Viitasalo and Komi 1977;Merletti et al 1990;Merletti and Lo Conte 1997). MNF and MDF decrease has been largely attributed to the diminished muscular fibre conduction velocity (MFCV) as a consequence of local metabolic changes in the working muscle (Bigland-Ritchie 1981;Masuda et al 1983). However, the modifications of the motor unit (MU) action potential shape, MU firing rate and synchronisation of MUs may contribute to MNF and MDF changes as well (Brody et al 1991;Bigland-Ritchie and Woods 1984;Dimitrova and Dimitrov 2003;Gabriel and Kamen 2009).…”

Section: Introductionmentioning

confidence: 97%

Evaluation of muscle fatigue during 100-m front crawl

et al. 2010

View full text Add to dashboard Cite

The aim of this study was to evaluate muscle fatigue in upper body muscles during 100-m all-out front crawl. Surface electromyogram (EMG) was collected from the pectoralis major, latissimus dorsi and triceps brachii muscles of 11 experienced swimmers. Blood lactate concentration level increased to 14.1 ± 2.9 mmol l(-1) 5 min after the swim. The velocity, stroke length and stroke rate calculated based on video analysis decreased by 15.0, 5.8 and 7.4%, respectively, during the swim. EMG amplitude of the triceps and the lower part of the latissimus muscles increased, whilst the mean power frequency (MNF) of all muscles significantly decreased by 20-25%. No significant differences in the relative MNF decrease were observed amongst the muscles; however, the differences in the rate of the MNF decrease between the lower part of the latissimus and the triceps brachii muscles were found (P < 0.05). The time of rest between the muscle activation of the two consecutive arm strokes at the end of swimming was extended (P < 0.05). It was concluded that 100-m all-out crawl induced significant fatigue with no evident differences amongst the analysed muscles.

show abstract

Section: Introductionmentioning

confidence: 97%

Evaluation of muscle fatigue during 100-m front crawl

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Commonly used multi-electrode arrays consist of several (up to 120) pinelectrodes arranged two-dimensionally with interelectrode distances in the millimetre-range. Multi-electrode arrays were ®rst described by Masuda et al (1983Masuda et al ( , 1985a, De Luca and Merletti (1987) and Reucher et al (1987a, b), and have recently become quite important (Roeleveld et al 1997(Roeleveld et al , 1998Sun et al 1999). …”

Section: Review Of the Hsr-emg Methodsmentioning

confidence: 98%

“…Compared to conventional single-lead recordings, they oer several advantages, one of the most meaningful being that they have been shown to allow the assessment of excitation spread and thus a non-invasive insight into the functional anatomy of the muscle (Masuda et al 1983(Masuda et al , 1985aReucher et al 1987b;Schneider et al 1989;Rau et al 1997b;Roeleveld et al 1997;Merletti et al 1999b). The combination of a two-dimensional Laplace ®lter with a multi-electrode array (HSR-EMG) provides not only information about single MU activity, but also makes the non-invasive assessment of the excitation spread along the muscle ®bres of single MU possible and allows a deeper insight into the structure of the MU.…”

Section: Review Of the Hsr-emg Methodsmentioning

confidence: 99%

Non-invasive approach of motor unit recording during muscle contractions in humans

Disselhorst‐Klug

Bahm

Ramaekers

et al. 2000

European Journal of Applied Physiology

View full text Add to dashboard Cite

Information about the structural and functional characteristics of the motor unit (MU) is highly relevant for the diagnosis of neuromuscular disorders. Electromyography (EMG) is a suitable method for obtaining the information needed. The problem is the separation of the activity of one MU from others which are simultaneously active. Such investigations of single MU activity have commonly used invasive methods, e.g. employing a needle or a wire. Conventional surface-EMG methods have limited resolution and detect, at high contraction levels, multiple MU superimposed one on the other. The separation of the activity of a single MU can be achieved in a non-invasive way when highly specialised acquisition techniques are used. One approach, called high spatial resolution EMG (HSR-EMG), is based on the use of multi-electrode arrays in combination with a two-dimensional Laplace filter. The HSR-EMG permits the completely non-invasive detection of single MU activity even during maximal voluntary contractions. First applications have shown that the method provides a deeper insight into the functional and structural characteristics of the MU. In this paper the application of HSR-EMG to the diagnosis of neuromuscular disorders will be presented, and the latest results will be given of its application in the evaluation of treatment of patients with plexus lesion.

show abstract

“…This technique has already proved to be a valuable tool in different fields of basic research (CHANAUD et al, 1987;MASUDA et al, 1983aMASUDA et al, , b, 1985MERLETTI et al, 2003) and clinical applications (DROST et al, 2001;KUMAGAI and YAMADA, 1991;WOOD et al, 2001).…”

mentioning

confidence: 97%

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.

View full text Add to dashboard Cite

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.

show abstract

The propagation of motor unit action potential and the location of neuromuscular junction investigated by surface electrode arrays

Cited by 59 publications

References 4 publications

Evaluation of muscle fatigue during 100-m front crawl

Evaluation of muscle fatigue during 100-m front crawl

Non-invasive approach of motor unit recording during muscle contractions in humans

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

Contact Info

Product

Resources

About