NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Influence of exercise training on the oxidative capacity of rat abdominal musclesOur purpose was to determine if endurance exercise training would increase the oxidative capacity of the abdominal expiratory muscles of the rat. Accordingly, 9 male rats were subjected to an endurance training protocol (1 h/day, 6 days/week, 9 weeks) and 9 litter-mates served as controls. Citrate synthase (CS) activity was used as an index of oxidative capacity, and was determined in the following muscles: soleus, plantaris, costal diaphragm, crural diaphragm, and in all four abdominal muscles: rectus abdominis, transversus abdominis, external oblique, and internal oblique. Compared to their non-trained litter-mates, the trained rats had higher peak whole body oxygen consumption rates (+ 16%) and CS activities in plantaris (+34%) and soleus (+36%) muscles. Thus, the training program caused substantial systemic and locomotor muscle adaptations. The CS activity of costal diaphragm was 20% greater in the trained animals, but no difference was observed in crural diaphragm. The CS activity in the abdominal muscles was less than one-half of that in locomotor and diaphragm muscles, and there were no significant changes with training except in the rectus abdominis where a 26% increase was observed. The increase in rectus abdominis CS activity may reflect its role in postural support and/or locomotion, as none of the primary expiratory pumping muscles adapted to the training protocol. The relatively low levels of CS activity in the abdominal muscles suggests that they are not recruited frequently at rest, and the lack of an increase with training indicates that these muscles do not contribute significantly to the increased ventilatory activity accompanying exercise in the rat.
Document ID
20050000730
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Uribe, J. M.
(University of Arizona Tucson 85721)
Stump, C. S.
Tipton, C. M.
Fregosi, R. F.
Date Acquired
August 22, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Respiration physiology
Volume: 88
Issue: 2-Jan
ISSN: 0034-5687
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: HL 41790
CONTRACT_GRANT: HL 33782
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Cardiopulmonary

Available Downloads

There are no available downloads for this record.
No Preview Available