Distribution and morphometry of skeletal muscle fibers in patients with chronic obstructive pulmonary disease and chronic hypoxemia.
This study was designed to assess the size and distribution of muscle fiber types in patients with severe chronic obstructive pulmonary disease and stable chronic hypoxemia. Brachial biceps biopsies were performed in 8 patients and 12 controls. Histochemistry was used to count and determine the cross-sectional area of the various fiber-types (1, 2a, and 2b). A significant reduction (P < 0.05) in the proportion of type 2a fibers and an increase in the proportion and cross-sectional area of type 2b fibers were seen in hypoxemic patients. These findings suggest an adaptation of the muscle fibers to a low partial pressure of oxygen in arterial blood.
Pereira
Mônica C
MC
Pulmonary Disease Service, Department of Clinical Medicine, Faculty of Medical Sciences, State University of Campinas, Cidade Universitária Zeferino Vaz, Barão Geraldo, CEP 13083-970, SP, Brazil. corso@mpcnet.com.br
Isayama
Ricardo N
RN
Seabra
José C
JC
Campos
Gerson E R
GE
Paschoal
Ilma A
IA
D000328:Adult; D000368:Aged; D002908:Chronic Disease; D005260:Female; D006801:Humans; D000860:Hypoxia / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D018485:Muscle Fibers, Skeletal / Q000737:chemistry / Q000473:pathology*; D018482:Muscle, Skeletal / Q000737:chemistry / Q000473:pathology*; D029424:Pulmonary Disease, Chronic Obstructive / Q000473:pathology*; D018709:Statistics, Nonparametric