Effects of Gender and Functional Overload on Plantaris Muscle Morphology in the Dwarf (HsdOla:dw-4) Lewis Rat
Document Type
Article
Publication Date
10-29-1999
Publication Source
Life Sciences
Abstract
To investigate relationships between pituitary function and gender on skeletal muscle growth and hypertrophy, fiber cross sectional area (CSA) and type were assessed in the plantaris muscle of normal and dwarf (Dw) male and female Lewis rats after 6 weeks of functional overload (FO). Serum growth hormone levels were 70–80% less in Dw rats of both genders and body mass was 62% greater in normal rats when compared to their Dw counterparts. Muscle weight was affected by gender, dwarfism, and FO as well as a significant gender∗Dw∗FO interaction. FO increased Type I, IIA, and IIX/B fiber CSA 120%, 102%, and 75%, respectively. Only type II fibers exhibited a reduction in CSA as a function of gender or dwarfism. Both type IIA and IIX/B fibers were affected by a significant gender∗Dw∗FO interaction. Our results suggest that the growth of type II fibers is sensitive to gender and pituitary function, while hypertrophy of type II muscle fibers is a function of the interaction between mechanical load, gender and pituitary function.
Inclusive pages
2489-2496
ISBN/ISSN
0024-3205
Copyright
Copyright © 1999, Elsevier Inc.
Publisher
Elsevier Inc.
Volume
65
Issue
23
Peer Reviewed
yes
eCommons Citation
Mulroy, Sean; Blough, Eric R.; Mehta, Erika K.; Myhal, Mark; and Linderman, Jon K., "Effects of Gender and Functional Overload on Plantaris Muscle Morphology in the Dwarf (HsdOla:dw-4) Lewis Rat" (1999). Health and Sport Science Faculty Publications. 85.
https://ecommons.udayton.edu/hss_fac_pub/85
COinS
Comments
Permission documentation on file.