Bioelectrical Impedance of the Left Ventricular Myocardium, Lung in Rats after Forced Swimming Training and Subsequent Detraining

• Published in: Journal of evolutionary biochemistry and physiology Vol. 59; no. 1; pp. 69 - 81
• Main Authors: Kolomeyets, N. L., Ivonin, A. G., Peshkin, E. A., Roshchevskaya, I. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2023; Springer Nature B.V
• Subjects: Animal Physiology; Biochemistry; Biomedical and Life Sciences; Edema; Electric currents; Evolutionary Biology; Exercise; Experimental Papers; Heart; Life Sciences; Myocardium; Physical activity; Physical fitness; Physical training; Structure-function relationships; Ventricle; swimming; forced training; lung and myocardial tissue bioimpedance; detraining
• ISSN: 0022-0930; 1608-3202
• DOI: 10.1134/S0022093023010064

Multifrequency bioimpedance studies were performed in rats subjected to an eight-week swimming course followed by an eight-week no-exercise period and control animals. A significantly lower ratio of the phase angles of the bioelectrical impedance of the lung tissue at two frequencies of electric current in rats after prolonged physical activity in comparison with control animals was revealed, which may indicate structural and functional changes in the lung tissue. No significant differences were found in the bioimpedance of the myocardium of the left ventricle of the heart in rats of the two groups after eight weeks of swimming. After an eight-week period of absence of physical activity, in detrained rodents, in comparison with controls, a significantly lower active resistance of the bioelectrical impedance of the myocardial tissue and a significantly higher ratio of the bioelectrical impedance resistance of the lung tissue at two frequencies of electric current were observed, which may indicate edema, as well as the preservation of those formed during exercise new microvessels.