Background: This study compared the influence of fasting/refeeding cycles and food restriction on rat myocardial performance and morphology.
Methods: Sixty-day-old male Wistar rats were submitted to food ad libitum (C), 50% food restriction (R50), and fasting/refeeding cycles (RF) for 12 weeks. Myocardial function was evaluated under baseline conditions and after progressive increase in calcium and isoproterenol. Myocardium ultrastructure was examined in the papillary muscle.
Results: Fasting/refeeding cycles maintained rat body weight and left ventricle weight between control and food-restricted rats. Under baseline conditions, the time to peak tension (TPT) was more prolonged in R50 than in RF and C rats. Furthermore, the maximum tension decline rate (-dT/dt) increased less in R50 than in RF with calcium elevation. While the R50 group showed focal changes in many muscle fibers, such as the disorganization or loss of myofilaments, polymorphic mitochondria with disrupted cristae, and irregular appearance or infolding of the plasma membrane, the RF rats displayed few alterations such as loss or disorganization of myofibrils.
Conclusion: Food restriction promotes myocardial dysfunction, not observed in RF rats, and higher morphological damage than with fasting/refeeding. The increase in TPT may be attributed possibly to the disorganization and loss of myofibrils; however, the mechanisms responsible for the alteration in -dT/dt in R50 needs to be further clarified.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.carpath.2009.08.001 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Water hyacinth conversion to biochar for soil nutrient enhancement in improving agricultural product.
Sci Rep
January 2025
College of Natural and Computational Sciences, University of Gondar, P.O. Box 196, Gondar, Ethiopia.
The conversion of water hyacinth into biochar offers a sustainable solution to mitigate its proliferation and enhances its potential as a soil amendment for agriculture. This study examined the physicochemical properties of water hyacinth biochar (WHBC) and its impact on soil fertility. Water hyacinth (Eichhornia crassipes) was pyrolyzed at 300 °C for 40 minute with restricted airflow (2-3 m/s), producing biochar with desirable properties and a yield of 44.
View Article and Find Full Text PDFSelective diet induced nutritional optic neuropathy in developmentally normal children.
Am J Ophthalmol Case Rep
March 2025
Department of Ophthalmology, Boston Children's Hospital, 300 Longwood Ave, Fegan 4, Boston, MA, 02115, USA.
Purpose: Nutritional deficiencies in developed countries are a rare but potentially intervenable cause of optic neuropathy in pediatric populations. To date, much of the literature on nutritional optic neuropathy has focused on children with developmental delay, however, a growing body of evidence supports other underreported risk factors.
Observations: We describe three pediatric patients with normal neurodevelopment, who presented with decreased vision and were subsequently found to have optic neuropathy attributed to vitamin deficiencies, predominantly vitamin B12.
Association of Dietary Intake of Vitamin A With Adolescent Hypertension: A Cross-Sectional Study Based on NHANES 1999-2018.
Food Sci Nutr
January 2025
Department of Cardiology The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou Municipal Hospital, Gusu School, Nanjing Medical University Suzhou China.
We aimed to investigate the association between dietary intake of vitamin A and risk of hypertension during adolescence. We interrogated the National Health and Nutrition Examination Survey (NHANES) database, from which individual-level data on dietary intake of vitamin A were garnered from 13,909 adolescents (aged 10-19 years) participating in the 1999-2018 study cycle. After dividing vitamin A intake into four quartiles, we leveraged weighted multivariate logistic regression to investigate the association of vitamin A intake with hypertension by each quartile, with the restricted cubic spline (RCS) curve plotted to assess the nonlinearity of association.
View Article and Find Full Text PDFAssociation Between Sugar-Sweetened Beverage Consumption and Frailty Among Older Adults With Hypertension: Evidence From the National Health and Nutrition Examination Survey 1999-2020.
Food Sci Nutr
January 2025
Department of Anesthesiology, The Third Xiangya Hospital Central South University Changsha Hunan China.
Frailty is a condition characterized by increased vulnerability to adverse health outcomes, particularly among older adults. With the significant prevalence of hypertension and the consumption of sugar-sweetened beverages (SSBs) in this demographic, it is essential to explore their potential combined effects on frailty. This cross-sectional study utilized data from the National Health and Nutrition Examination Survey (NHANES) spanning 1999-2020, involving 13,465 hypertensive adults aged 60 and above.
View Article and Find Full Text PDFThe genus , commonly found in fermented foods, is a significant group of lactic acid bacteria (LAB) with potential probiotic properties. Several strains have been proposed as probiotics due to their biotechnological capabilities. However, a few strains may exhibit opportunistic pathogenic behavior, which restricts the widespread use of all strains in food applications.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!