Normal maximal and minimal motor nerve conduction velocities in adults determined by a collision method

Arasaki, Keisuke; Iijima, Mayumi; Nakanishi, T

doi:10.1002/mus.880140708

Cited by 27 publications

(17 citation statements)

References 18 publications

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“…Branches of common-stem presynaptic ®bers producing excitatory post synaptic potentials produce short-term synchronization, and the peak of the spike observed in the cross-interval histogram is one measure of the strength of the common inputs (Kirkwood and Sears 1978). Motor nerve conduction velocity declines with age (Arasaki et al 1991;Wagman and Lesse 1952), and one might speculate that the characteristics of the short-term synchronization peak might be less well-de®ned in older individuals as a result of declines in motor nerve conduction velocity. However, relative to the spinal cord-muscle distance, the declines in conduction velocity are small.…”

Section: Discussionmentioning

confidence: 98%

Motor unit synchronization in young and elderly adults

Kamen

Roy²

2000

European Journal of Applied Physiology

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In an effort to determine whether aging might alter the manner in which pairs of motor units are coactivated, the extent of motor unit synchronization was assessed in the first dorsal interosseous (FDI) muscle in seven young (mean 28 years) and eight older adults (mean 75 years). During constant-force isometric contractions at either 50% or 100% of maximal effort, motor units were recorded using a four-wire needle electrode and a multi-channel recording technique. Customized software was utilized to identify the occurrences of motor unit action potentials from the resultant three-channel signals. The magnitude of motor unit synchronization was determined using six variables that have been described previously in the literature. The extent of motor unit synchronization was similar in both young and older adults, occurring in nearly every motor unit pair observed. During the 50% maximum voluntary contractions, the CIS synchronization measure (the number of synchronized discharges per unit time) averaged 2.5 in the young subjects and 2.4 in the older individuals. The intensity of motor unit synchronization was somewhat greater during maximal force isometric contractions. We conclude that motor unit synchronization in the FDI muscle is a ubiquitous phenomenon that is not affected by the aging process.

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Section: Discussionmentioning

confidence: 98%

Motor unit synchronization in young and elderly adults

Kamen

Roy²

2000

European Journal of Applied Physiology

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“…Usually, NCV is measured using a surface electrode (conventional conduction velocity, C‐CV). C‐CV does not optimally assess the overall conduction properties of a nerve, because it reflects mainly the fastest conducting subset of the alpha motor axon population 3. However, in its early stages, polyneuropathy does not affect nerves uniformly 4.…”

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confidence: 99%

Single‐fiber conduction velocity test allows earlier detection of abnormalities in diabetes

et al. 2011

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“…The standard motor nerve conduction velocity of NCV , the conduction velocity found using equation (1), is calculated on the basis of the latency time difference between the administration of the stimulus until the start of the action potential, and reflects the fastest motor unit among compound action potentials [18]. In addition to this method, we also calculated nerve conduction velocity using a method that examines time difference from the cross-correlation of the various waves of the overall action potential waveform ( NCVCC ).…”

Section: Discussionmentioning

confidence: 99%

A novel approach for evaluating nerve function in healthy elderly persons: A pilot study

et al. 2013

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BackgroundMotor nerve function decreases with age and can cause abnormalities in motor function. Using newly designed methods, we used evoked electromyograms to evaluate change in motor nerve function.Material/MethodsMotor function was assessed by grip strength, timed up-and-go test, 5-m normal walk, and 5-m fastest walk. In addition, motor nerve conduction velocity was calculated by measuring latency differences (NCV) in elderly and young subjects. We also investigated motor nerve conduction velocity by correlation coefficient (NCVCC) and the difference between NCV and NCVCC (DNCV).ResultsSignificant differences were observed in the motor function of elderly and young persons in grip strength, the timed up-and-go test, and the 5-m fastest walk; however, no difference was observed in the 5-m normal walk test. NCVCC was lower than NCV in both elderly and young. The correlation coefficient peak of the NCVCC calculation was lower in elderly than in young. A negative correlation was observed between correlation coefficient peak and DNCV in elderly subjects.ConclusionsNCVCC compares the overall shape of compound muscle action potential and reflects not only the fastest motor unit, but also the motor nerve conduction velocity of other motor unit components. A significant negative correlation between DNCV and the correlation coefficient peak was observed only in elderly subjects, suggesting that older individuals, including those that maintain a high level of physical strength, experience a loss of motor nerve function. Thus, changes in motor nerve function among elderly persons can potentially be further examined for clinical use.

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Normal maximal and minimal motor nerve conduction velocities in adults determined by a collision method

Cited by 27 publications

References 18 publications

Motor unit synchronization in young and elderly adults

Motor unit synchronization in young and elderly adults

Single‐fiber conduction velocity test allows earlier detection of abnormalities in diabetes

A novel approach for evaluating nerve function in healthy elderly persons: A pilot study

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