The utility of interference pattern analysis

Fuglsang-Frederiksen, Anders

doi:10.1002/(sici)1097-4598(200001)23:1<18::aid-mus4>3.0.co;2-b

Cited by 89 publications

(39 citation statements)

References 175 publications

(230 reference statements)

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“…This spectral change can be partially attributed to the change in conduction velocity of the Motor Unit Action Potentials (MUAPs) along the muscle fibre [3]- [10]. As the muscle fatigues, lactic acid and K + accumulates in the extracellular muscle space, impairing conduction of the action potentials across the muscle membrane, thus slowing down MUAPs [11].…”

Section: Introductionsupporting

confidence: 91%

A Muscle Fibre Conduction Velocity Tracking ASIC for Local Fatigue Monitoring

Koutsos

Cretu

Georgiou

2016

IEEE Trans. Biomed. Circuits Syst.

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Abstract-Electromyography analysis can provide information about a muscle's fatigue state by estimating Muscle Fibre Conduction Velocity (MFCV), a measure of the travelling speed of Motor Unit Action Potentials (MUAPs) in muscle tissue. MFCV better represents the physical manifestations of muscle fatigue, compared to the progressive compression of the myoelectic Power Spectral Density, hence it is more suitable for a muscle fatigue tracking system. This paper presents a novel algorithm for the estimation of MFCV using single threshold bit-stream conversion and a dedicated ASIC for its implementation, suitable for a compact, wearable and easy to use muscle fatigue monitor. The presented ASIC is implemented in a commercially available AMS 0.35µm CMOS technology and utilizes a bit-stream crosscorrelator that estimates the conduction velocity of the myoelectric signal in real time. A test group of 20 subjects was used to evaluate the performance of the developed ASIC, achieving good accuracy with an error of only 3.2% compared to Matlab.

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Section: Introductionsupporting

confidence: 91%

A Muscle Fibre Conduction Velocity Tracking ASIC for Local Fatigue Monitoring

Koutsos

Cretu

Georgiou

2016

IEEE Trans. Biomed. Circuits Syst.

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“…However, these quantitative EMG approaches increase specificity at the expense of reduced sensitivity. Alternatively, interference pattern analysis methods (34,35) or the recently proposed Bayesian muscle characterization (36) can be adopted for the analysis of needle EMG recordings. However, as the needle EMG is typically performed at low-force contraction levels, the estimates of MUAP features that can be obtained by the former and the latter methods are biased by slow motor units.…”

Section: Discussionmentioning

confidence: 99%

Do muscle fiber conduction slowing and decreased levels of circulating muscle proteins represent sensitive markers of steroid myopathy? A pilot study in Cushing's disease

Minetto¹,

Lanfranco²,

Botter³

et al. 2011

European Journal of Endocrinology

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Objective: Glucocorticoids are known to decrease protein synthesis and conduction velocity of muscle fibers. However, the degree of impairment of muscle protein synthesis and conduction slowing in patients with Cushing's disease remains poorly characterized. Our objective was to investigate whether and to what extent chronic endogenous hypercortisolism could decrease the circulating levels of muscle proteins and modify myoelectric indexes of sarcolemmal excitability and fatigability. Design: A total of ten patients with Cushing's disease and 30 healthy controls matched for age, sex, and body mass index were compared. Methods: Blood sampling and electrophysiological tests on vastus lateralis, vastus medialis, and tibialis anterior muscles were performed. Results: Serum creatine kinase (CK) and plasma myoglobin were significantly lower in patients with respect to controls (P!0.001 and P!0.05 respectively): the mean relative difference between patients and controls was 48.9% for CK and 21.4% for myoglobin. Muscle fiber conduction velocity (MFCV) and myoelectric manifestations of fatigue were significantly decreased in all muscles of the patients with respect to controls. The mean relative difference in MFCV between patients and controls was 26.0% for vastus lateralis, 22.9% for vastus medialis, and 11.6% for tibialis anterior. These differences contrasted with the paucity of signs suggestive of myopathy that were obtained by needle electromyography in the patients. Conclusions: Slowing of muscle fiber conduction and decreased levels of circulating muscle proteins are sensitive markers of impaired muscle function, which are suitable for use in combination with clinical assessment and standard electrodiagnostic tests for accurate identification and follow-up of myopathic patients. 164 985-993 European Journal of Endocrinology

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“…A slightly more complex method of analysis was reviewed by Fuglsang-Frederiksen (2000). When comparing the activation of different muscles, he found that the turns/amplitude analysis method was more useful than other methods.…”

Section: Introductionmentioning

confidence: 99%