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Short-term exercise training improves diaphragm antioxidant capacity and endurance
H K Vincent1, S K Powers, D J Stewart
1Department of Exercise and Sport Sciences and Physiology and Center for Exercise and Sports Science, 25 Florida Gym, University of Florida, Gainesville, FL 32611, USA.
European Journal of Applied Physiology
|November 7, 1999
Summary
Short-term endurance exercise rapidly enhances diaphragm antioxidant capacity and fatigue resistance in rats. This 5-day training improves oxidative defenses, reducing exercise-induced oxidative stress.
Area of Science:
- Exercise Physiology
- Respiratory Muscle Adaptation
- Oxidative Stress Biology
Background:
- Diaphragm muscle is crucial for respiration.
- Exercise training effects on respiratory muscles are not fully understood.
- Oxidative stress can impair muscle function.
Purpose of the Study:
- To investigate if 5 days of endurance exercise training rapidly improves diaphragm oxidative/antioxidant capacity.
- To determine if training protects the diaphragm against contraction-induced oxidative stress.
- To assess the impact of training on diaphragm fatigue resistance.
Main Methods:
- Male Sprague-Dawley rats underwent 5 days of treadmill exercise.
- Diaphragm strips were analyzed for force production, fatigue resistance, and biochemical markers.
- Measurements included citrate synthase, catalase, superoxide dismutase, and glutathione levels.
- Lipid hydroperoxide concentrations were assessed post-fatigue protocol.
Main Results:
- Exercise training did not alter diaphragm force-frequency characteristics.
- Trained rats showed improved diaphragm resistance to fatigue.
- Lipid hydroperoxide concentrations were 30% lower in trained rats post-fatigue.
- Oxidative and antioxidant capacity markers (citrate synthase, catalase, SOD, glutathione) increased significantly in trained rats.
Conclusions:
- Short-term endurance exercise rapidly elevates diaphragm oxidative capacity and antioxidant defenses.
- Enhanced antioxidant defenses reduce contraction-induced lipid peroxidation.
- Exercise training improves diaphragm fatigue resistance and oxidative stress protection.