Morphological and functional characteristics of skeletal muscle fibers from hormone-replaced and nonreplaced postmenopausal women
Journals of Gerontology - Series A Biological Sciences and Medical Sciences, ISSN: 1079-5006, Vol: 58, Issue: 1, Page: 3-10
2003
- 32Citations
- 23Captures
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Metrics Details
- Citations32
- Citation Indexes32
- 32
- CrossRef27
- Captures23
- Readers23
- 23
Article Description
We tested the hypothesis that cross-bridge mechanisms of contraction differed in early postmenopausal women who did or did not receive hormone replacement therapy (HRT). Vastus lateralis biopsies were obtained from 17 postmenopausal women (49-57 years old), 8 of whom were on HRT for the previous 24 ± 5 months and 9 of whom were never on HRT. Electrophoresis and enzyme histochemistry revealed that fiber myosin heavy chain (MHC) isoform distribution, the cross-sectional area (CSA) of slow and fast fibers, and the relative CSA occupied by each, were similar for HRT and non-HRT groups. Single permeabilized fibers containing type IIa MHC had greater Ca -activated peak specific force, unloaded shortening velocity, and peak power than fibers containing type I MHC, but in all cases the values for HRT and non-HRT groups were similar. In this cross-sectional study, we found no evidence that Ca activated fiber function, MHC isoform distribution, or relative CSA occupied by slow and fast fibers differed between HRT and non-HRT groups.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0037242862&origin=inward; http://dx.doi.org/10.1093/gerona/58.1.b3; http://www.ncbi.nlm.nih.gov/pubmed/12560405; https://academic.oup.com/biomedgerontology/article/58/1/B3/582355; https://academic.oup.com/biomedgerontology/article-lookup/doi/10.1093/gerona/58.1.B3; http://academic.oup.com/biomedgerontology/article-pdf/58/1/B3/1564328/B3.pdf; https://dx.doi.org/10.1093/gerona/58.1.b3; https://academic.oup.com/biomedgerontology/article-abstract/58/1/B3/582355?redirectedFrom=fulltext
Oxford University Press (OUP)
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