title: MR relaxation times and fiber type predominance of the psoas and multifidus muscle. An autopsy study.
abstract: MR relaxation times, fiber composition, nonmyofiber space, water content, and fat content of human psoas and multifidus muscle samples of 10 male cadavers were studied in vitro. The T1 and T2 relaxation times of multifidus muscle were significantly longer than those of the psoas muscle. On average, type 1 fibers (slow fibers with a small cross-sectional diameter) predominated in both muscles. There was no correlation between the relative mass of type 1 or 2 fibers (fast fibers with a large cross-sectional diameter) or nonmyofiber space and the relaxation times. The quantity of fat in the muscle did not correlate with the relaxation times either.
authors.affiliation: Department of Diagnostic Radiology, Turku University Hospital, Finland.
authors.forename: R
authors.initials: R
authors.lastname: Parkkola
authors.forename: A
authors.initials: A
authors.lastname: Alanen
authors.forename: H
authors.initials: H
authors.lastname: Kalimo
authors.forename: I
authors.initials: I
authors.lastname: Lillsunde
authors.forename: M
authors.initials: M
authors.lastname: Komu
authors.forename: M
authors.initials: M
authors.lastname: Kormano
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001344:Autopsy; D006801:Humans; D066298:In Vitro Techniques; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009126:Muscle Relaxation / Q000502:physiology; D009132:Muscles / Q000473:pathology* / Q000502:physiology*; D016658:Psoas Muscles / Q000473:pathology / Q000502:physiology