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Diaphragmatic function after resistive breathing in vitamin E-deficient rats
A Anzueto1, F H Andrade, L C Maxwell
1Department of Medicine, University of Texas Health Science Center, San Antonio.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 1, 1993
Summary
Vitamin E deficiency worsens diaphragm dysfunction caused by resistive breathing (RB). This deficiency increases lipid peroxidation and impairs muscle function, highlighting the critical role of vitamin E in respiratory health.
Area of Science:
- Physiology
- Nutritional Science
- Respiratory Medicine
Background:
- Diaphragm function is crucial for respiration.
- Oxidative stress can impair muscle function.
- Vitamin E is a key antioxidant.
Purpose of the Study:
- To investigate the impact of vitamin E deficiency on diaphragm contractile function.
- To assess oxidative stress markers in the diaphragm after resistive breathing.
- To determine if vitamin E deficiency exacerbates exercise-induced diaphragm dysfunction.
Main Methods:
- Sprague-Dawley rats were fed either vitamin E-deficient or sufficient diets.
- Animals underwent resistive breathing (RB) or served as controls.
- Diaphragm function (twitch and tetanic tensions, fatigue) and biochemical markers (lipid peroxidation, glutathione redox state) were analyzed.
Main Results:
- Resistive breathing reduced diaphragm contractile function in both vitamin E-sufficient and deficient rats.
- Vitamin E deficiency significantly exacerbated the reduction in diaphragm tension.
- Vitamin E deficiency increased diaphragm lipid peroxidation and altered the glutathione redox state.
Conclusions:
- Resistive breathing induces diaphragm dysfunction and oxidative stress.
- Vitamin E deficiency significantly worsens these effects, impairing diaphragm contractile function.
- Adequate vitamin E status is essential for maintaining diaphragm function under respiratory stress.