The effects of aging on biceps brachii muscle fibers: a morphometrical study from biopsies and autopsies
Arq. neuropsiquiatr
;
61(3A): 555-560, Sept. 2003. ilus, tab, graf
Article
in English
| LILACS
| ID: lil-345767
RESUMO
OBJECTIVES: In order to study the morphology and size of muscle fibers, cross sections of biceps brachii samples from autopsies, up to 9 hours after death, and biopsies of 72 subjects were compared. The subjects aged 13 to 84 years in both sexes. METHODS: The samples obtained from autopsies (n=47) were from subjects with sudden death, or who died after acute disease without evidence of neuromuscular involvement. The biopsies (n=25) were from patients with symptoms suggestive of inflammatory or metabolic myopathy, not confirmed morphologically. The lesser diameter of muscle fibers was measured using the ATPase reaction. RESULTS: Morphological analysis showed that aging changes were present from the sixth decade in autopsies, and consisted of atrophy and/or type-grouping. The statistical models adjusted for females in both autopsies and biopsies were linear straight with no variation in fiber size with increasing age. The models adjusted for males in both groups were quadratic, indicating that age influenced the size of different type fibers. In males type 2 were larger than type 1 fibers, and than fibers in females. CONCLUSIONS: These values might be useful as controls, helping interpretation of changes in fiber size in samples obtained from biopsies and autopsies
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Aging
/
Muscle Fibers, Skeletal
Type of study:
Prognostic study
/
Risk factors
Limits:
Adolescent
/
Adult
/
Aged80
/
Female
/
Humans
/
Male
Language:
English
Journal:
Arq. neuropsiquiatr
Journal subject:
Neurology
/
Psychiatry
Year:
2003
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Rio de Janeiro/BR
/
Federal University of Säo Carlos/BR
/
University of Säo Paulo/BR
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