Sökning: WFRF:(Nandedkar Sanjeev)
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Motor unit recruitm...
Motor unit recruitment and firing rate at low force of contraction
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- Nandedkar, Sanjeev D. (författare)
- Natus Med Inc, Clin Applicat, Hopewell Jct, NY 12533 USA.;Med Coll Wisconsin, Dept Neurol, Milwaukee, WI 53226 USA.
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- Barkhaus, Paul E. (författare)
- Med Coll Wisconsin, Dept Neurol, Milwaukee, WI 53226 USA.
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- Stålberg, Erik V. (författare)
- Uppsala universitet,Klinisk neurofysiologi
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Natus Med Inc, Clin Applicat, Hopewell Jct, NY 12533 USA;Med Coll Wisconsin, Dept Neurol, Milwaukee, WI 53226 USA. Med Coll Wisconsin, Dept Neurol, Milwaukee, WI 53226 USA. (creator_code:org_t)
- 2022-10-21
- 2022
- Engelska.
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Ingår i: Muscle and Nerve. - : John Wiley & Sons. - 0148-639X .- 1097-4598. ; 66:6, s. 750-756
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Introduction/Aims: A prevailing concept of motor unit (MU) recruitment used for calculating recruitment ratio (RR) suggests a progressive linear increase in firing rate (FR). The objective of this study is to assess its validity. Methods: Concentric needle electromyography (EMG) recordings were made in normal muscle and abnormal muscle of patients with neurogenic findings. Signals recorded at low force were visually decomposed to study MU FR at onset, recruitment of a second MU, and recruitment of more MUs with further increases in force. Results: We observed one to six MUs discharging at a rate < 15 Hz in normal muscles at low force. The MU FR was 5-8 Hz at onset. With increasing force, FR increased by 3-5 Hz and then idled at <15 Hz while other MUs were recruited. The recruitment frequency (RF) and RR had low sensitivity and were abnormal mainly in moderately to severely weak muscles. Discussion: Our data are consistent with FR analysis results described by other investigators. It does not support a progressive linear increase in MU FR with recruitment. A revised model for MU recruitment at low effort during gradual increase in force is presented. On subjective assessment, the FR of the fastest firing MU can help detect MU loss in neurogenic processes.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Neurologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Neurology (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Fysiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Physiology (hsv//eng)
Nyckelord
- firing rate
- motor unit
- neuropathy
- recruitment
- recruitment frequency
- recruitment ratio
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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