title: Double discharges in human soleus muscle.
abstract: Double discharges (doublets) were recorded from human soleus (SOL), where they have never been reported before. The data analyzed in this study were collected from 12 healthy volunteers. The subjects were recruited for other studies, concerning: (1) estimation of motoneurons' (MNs) afterhyperpolarization (AHP) duration and (2) analysis of motor unit responses to nerve stimulation, and were not trained to voluntarily evoke doublets. The majority of intradoublet intervals fell into the commonly accepted range 2-20 ms. However, two SOL MNs from one presented exceptional doublets of intradoublet interval about 37 ms. This interval was virtually identical with the interval between second and third discharge in the few triplets recorded from another subject. It is hypothesized that triplets are generated by the delayed depolarization with the second narrow hump, which is the same as the hump responsible for exceptional doublets.
authors.affiliation: Polish Academy of Sciences, Department of Engineering of Nervous and Muscular System, Nałęcz Institute of Biocybernetics and Biomedical Engineering, Warsaw Poland.
authors.forename: Maria
authors.initials: M
authors.lastname: Piotrkiewicz
authors.affiliation: Laboratory of Neuromuscular Research, Koç University School of Medicine, Istanbul Turkey.
authors.forename: Oğuz
authors.initials: O
authors.lastname: Sebik
authors.affiliation: Faculty of Medicine, Department of Biophysics, Ege University, Izmir Turkey.
authors.forename: Erdal
authors.initials: E
authors.lastname: Binboğa
authors.affiliation: Polish Academy of Sciences, Department of Engineering of Nervous and Muscular System, Nałęcz Institute of Biocybernetics and Biomedical Engineering, Warsaw Poland.
authors.forename: Dariusz
authors.initials: D
authors.lastname: Młoźniak
authors.affiliation: Polish Academy of Sciences, Department of Engineering of Nervous and Muscular System, Nałęcz Institute of Biocybernetics and Biomedical Engineering, Warsaw Poland.
authors.forename: Bożenna
authors.initials: B
authors.lastname: Kuraszkiewicz
authors.affiliation: Laboratory of Neuromuscular Research, Koç University School of Medicine, Istanbul Turkey.
authors.forename: Kemal S
authors.initials: KS
authors.lastname: Türker
keywords: delayed depolarization; double discharges; firing patterns; human motoneuron; soleus