Effects of hyperoxia on rat diaphragm function
| Autor: | S. G. Jenkinson, Antonio Anzueto, R. A. Lawrence, Stephanie M Levine, L. C. Maxwell, Francisco H. Andrade, J. M. Brassard |
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| Rok vydání: | 1994 |
| Předmět: |
Male
medicine.medical_specialty Free Radicals Physiology Radical Diaphragm Isometric exercise Hyperoxia Rats Sprague-Dawley chemistry.chemical_compound Oxygen Consumption Physiology (medical) Internal medicine medicine Animals Airway Resistance Glutathione Organ Size Diaphragm (structural system) Rats Endocrinology chemistry Anesthesia Muscle Fatigue Room air distribution Glutathione disulfide Rat Diaphragm medicine.symptom Muscle Contraction |
| Zdroj: | Journal of applied physiology (Bethesda, Md. : 1985). 77(1) |
| ISSN: | 8750-7587 |
| Popis: | The association of oxygen radical generation with impaired diaphragm performance has previously been reported after inspiratory resistive loading (IRL). We hypothesized that exposure of rats to normobaric hyperoxia (O2) could produce impaired diaphragm function because of free radical production. Sprague-Dawley rats were divided into four groups: 1) room air (control), 2) > 95% O2 for 24 h, 3) > 95% O2 for 48 h, and 4) > 95% O2 for 60 h. Each group was studied at rest after the O2 exposure and then after IRL. During IRL, the animals breathed through an inspiratory resistor until they were unable to sustain > 70% of the maximum airway pressure. Diaphragm samples were obtained for analysis of glutathione (GSH) and glutathione disulfide (GSSG) concentrations. In vitro isometric contractile properties were also determined, including maximal tetanic tension (Po) and maximal twitch tension (Pt), in GSSG content and in GSSG-to-GSH ratios. Hyperoxia for > 48 h resulted in significant decreases in Po and Pt and an increase in GSSG content and in GSSG-to-GSH ratios compared with other groups. Those same animals subjected to IRL showed a further decrease in Po and Pt. These data suggest that free radical generation may occur in the diaphragm during a hyperoxia exposure associated with activation of the GSH redox cycle and impairment of diaphragm function. |
| Databáze: | OpenAIRE |
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