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A Reproducible Intensive Care Unit-Oriented Endotoxin Model in Rats
Published on: February 20, 2021
Exercise training attenuates septic responses in conscious rats.
Hsing I Chen1, Shu-Ya Hsieh, Fwu-Lin Yang
1Institute of Medical Sciences, Tzu Chi Hospital and University, Hualien, Taiwan. chenhi@mail.tcu.edu.tw
Medicine and Science in Sports and Exercise
|May 3, 2007
Summary
Exercise training improves responses to endotoxin and protects organs from sepsis-induced damage. This study shows that exercise training attenuates septic responses and reduces organ pathology in rats.
Area of Science:
- Physiology
- Pathology
- Exercise Science
Background:
- Sepsis, a life-threatening organ dysfunction caused by a dysregulated host response to infection, is a major global health concern.
- Endotoxemia, induced by lipopolysaccharide (LPS), serves as a model to study sepsis-induced physiological and pathological changes.
- The role of exercise training in modulating the body's response to endotoxin and its protective effects on organ damage remains an area of active investigation.
Purpose of the Study:
- To investigate the impact of exercise training on physiological and biochemical alterations induced by endotoxin administration in a rat model.
- To assess the protective effects of exercise training against endotoxin-induced damage in vital organs, including the heart, liver, and lungs.
Main Methods:
- Twenty-four male Wistar-Kyoto rats were divided into an exercise-trained group (Tr) and a sedentary control group (Con) for four weeks.
- Endotoxemia was induced via intravenous lipopolysaccharide (LPS) infusion, followed by 72 hours of observation.
- Measurements included arterial pressure, heart rate, blood cell counts, plasma biochemical markers, inflammatory cytokines, and histopathological examination of major organs.
Main Results:
- Exercise-trained rats exhibited lower basal levels of arterial pressure, heart rate, methyl guanidine (MG), neutrophils, and creatinine (Cr) compared to controls.
- Exercise training attenuated LPS-induced decreases in blood cells and reduced elevated plasma levels of nitrite/nitrate, MG, biochemical factors, and proinflammatory cytokines.
- Histopathological analysis revealed significantly less cardiac, hepatic, and pulmonary injury in the exercise-trained group compared to the control group.
Conclusions:
- Exercise training significantly attenuates the systemic inflammatory response to endotoxin.
- Pre-conditioning with exercise training provides substantial protection to vital organs against sepsis-induced damage.
- Regular exercise may be a beneficial strategy for improving outcomes in sepsis and related conditions.
