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Jaenisch RB, Stefani GP, Durante C, Chechi C, Hentschke VS, Rossato DD, Sonza A, Rhoden CR, Dal Lago P. Respiratory muscle training decreases diaphragm DNA damage in rats with heart failure. Can J Physiol Pharmacol 2018; 96:221-226. [DOI: 10.1139/cjpp-2017-0069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Respiratory muscle training (RMT) promotes beneficial effects on respiratory mechanics, heart and lung morphological changes, and hemodynamic variables in rats with heart failure (HF). However, the relation between RMT effects and diaphragm oxidative stress remains unclear. Therefore, the aim of this study was to evaluate the RMT effects on diaphragm DNA damage in HF rats. Wistar rats were allocated into 4 groups: sedentary sham (Sed-Sham, n = 8), trained sham (RMT-Sham, n = 8), sedentary HF (Sed-HF, n = 8), and trained HF (RMT-HF, n = 8). The animals underwent a RMT protocol (30 min/day, 5 days/week for 6 weeks), whereas sedentary animals did not exercise. Groups were compared by a two-way ANOVA and Tukey’s post hoc tests. In rats with HF, RMT promoted reduction in pulmonary congestion (p < 0.0001) and left ventricular end diastolic pressure (p < 0.0001). Moreover, RMT produced a decrease in the diaphragm DNA damage in HF rats. This was demonstrated through the reduction in the percentage of tail DNA (p < 0.0001), tail moment (p < 0.01), and Olive tail moment (p < 0.001). These findings showed that a 6-week RMT protocol in rats with HF promoted an improvement in hemodynamic function and reduces diaphragm DNA damage.
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Affiliation(s)
- Rodrigo B. Jaenisch
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Giuseppe P. Stefani
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Camila Durante
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Chalyne Chechi
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Vítor S. Hentschke
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Douglas D. Rossato
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Anelise Sonza
- Physical Therapy Department, Santa Catarina State University, Florianópolis, Santa Catarina, Brazil
- Post Graduation Program in Rehabilitation Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Cláudia R. Rhoden
- Laboratory of Atmospheric Pollution and Oxidative Stress, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Pedro Dal Lago
- Laboratory of Experimental Physiology, Post Graduation Program in Health Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Post Graduation Program in Rehabilitation Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Physical Therapy Department, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
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