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Influence of exercise and fiber type on antioxidant enzyme activity in rat skeletal muscle.
- Source :
-
The American journal of physiology [Am J Physiol] 1994 Feb; Vol. 266 (2 Pt 2), pp. R375-80. - Publication Year :
- 1994
-
Abstract
- These experiments examined the influence of exercise intensity and duration on antioxidant enzyme activity in locomotor muscles differing in fiber type composition. Nine groups of female Sprague-Dawley rats (age 120 days) exercised 4 days/wk on a motor-driven treadmill for 10 wk. The impact of three levels of exercise intensity (low, moderate, and high: approximately 55, approximately 65, and approximately 75% of maximal oxygen consumption, respectively) and exercise duration (30, 60, and 90 min/day) was assessed. Sedentary animals served as controls. Oxidative capacity in the soleus and white and red gastrocnemius was assessed by measurement of citrate synthase (CS) activity, and antioxidant capacity was evaluated by assay of total superoxide dismutase, catalase, and total glutathione peroxidase (GPX) activities. In all muscles, CS activity increased as a function of exercise duration. Furthermore, in the soleus and white gastrocnemius, the magnitude of the training-induced increase in CS activity was directly related to exercise intensity. In contrast, the peak increase in CS activity in the red gastrocnemius was relatively independent of exercise intensity. Catalase activity was not increased (P > 0.05) in any muscle with training. Training-induced changes in superoxide dismutase and GPX activities were muscle specific; specifically, exercise training significantly (P < 0.05) increased superoxide dismutase activity in the soleus as a function of exercise duration up to 60 min/day. Conversely, training-induced significant (P < 0.05) increases in GPX activity occurred in red gastrocnemius only; the magnitude of the GPX increase was directly related to exercise duration but relatively independent of intensity. These data demonstrate that exercise training-induced changes in muscle antioxidant enzymes are muscle specific.
- Subjects :
- Animals
Citrate (si)-Synthase metabolism
Female
Muscles anatomy & histology
Muscles enzymology
Organ Specificity
Rats
Rats, Sprague-Dawley
Time Factors
Catalase metabolism
Glutathione Peroxidase metabolism
Muscles physiology
Oxygen Consumption
Physical Conditioning, Animal
Superoxide Dismutase metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0002-9513
- Volume :
- 266
- Issue :
- 2 Pt 2
- Database :
- MEDLINE
- Journal :
- The American journal of physiology
- Publication Type :
- Academic Journal
- Accession number :
- 8141392
- Full Text :
- https://doi.org/10.1152/ajpregu.1994.266.2.R375