Abstract
The physiological changes, including cardiac modification, that occur during starvation are not yet completely understood. The purpose of this study is to examine the effects of a 2-week starvation period on heart contractility, muscle mass, and irisin and corticosterone levels in rats. Rats in the starved group showed a significant reduction in the body, heart, kidney, and muscle weight (n = 23, p < 0.05). Blood glucose, total protein, and albumin showed a 44, 17.5, and 10.3 % reduction, respectively (p < 0.05). Lipid reserves, such as total lipid, triglyceride, and free fatty acid, were also comparably reduced (p < 0.05). However, the bilirubin, creatinine, blood urea nitrogen, and creatine kinase levels were higher than in the control group (p < 0.05). The blood irisin level was unchanged, but the stress-related corticosterone level was significantly higher in the starved group. The differences observed in M-mode echocardiography were further compared with the body-weight-matched control group. Starvation reduced the left ventricle mass; however, this difference was not significant compared with the body-weight-matched group (p > 0.05). In the starvation group, the impairment of cardiac output was dependent on the reduction in stroke volume and heart rate. Starvation induced a severe reduction in ejection fraction and fractional shortening when compared with the body-weight-matched control group (p < 0.05). In summary, prolonged starvation, which leads to a deficiency of available nutrition, increases the stress-related corticosterone level, impairs the cardiac output, and is associated with changes in cardiac morphogeometry.
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) and the Korean government (MSIP) [2010–0020224 and 2012R1A2A1A03007595]. In addition, we give thanks to Samkwang Medical Laboratories (Seoul, Korea) for assistance in analyzing blood chemical profiling.
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Lee, S.R., Ko, T.H., Kim, H.K. et al. Influence of starvation on heart contractility and corticosterone level in rats. Pflugers Arch - Eur J Physiol 467, 2351–2360 (2015). https://doi.org/10.1007/s00424-015-1701-9
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DOI: https://doi.org/10.1007/s00424-015-1701-9