title: Pattern of electrical activity and force in normal and pathological muscle: S-index of turns and amplitude.
abstract: Cenkovich et al. (1982) found that a rotated hyperbolic curve fitted the relationship between the logarithm of cumulative amplitude (log A) and the logarithm of turns (log T). They found the intercept of the hyperbola (S-index) to be independent of force and suggested to use the S-index without measurement of the force as a diagnostic criterion. We have applied this modification of the method to our material previously published. In controls we found a slight increase in S-index with increasing force. The S-index was often increased in patients with myopathy and decreased in patients with neurogenic disorders, mostly at low to moderate force. The S-index was not better in discriminating patients from controls than the ratio of turns to mean amplitude.
authors.forename: A
authors.initials: A
authors.lastname: Fuglsang-Frederiksen
authors.forename: H
authors.initials: H
authors.lastname: Christensen
authors.forename: M
authors.initials: M
authors.lastname: Lo Monaco
authors.forename: K
authors.initials: K
authors.lastname: Dahl
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004576:Electromyography; D004594:Electrophysiology; D006801:Humans; D008875:Middle Aged; D009119:Muscle Contraction; D009468:Neuromuscular Diseases / Q000503:physiopathology*