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CC BY-NC-ND 4.0 · Int J Sports Med 2022; 43(03): 219-229
DOI: 10.1055/a-1539-6702
DOI: 10.1055/a-1539-6702
Physiology & Biochemistry
Excessive Treadmill Training Produces different Cardiac-related MicroRNA Profiles in the Left and Right Ventricles in Mice
Funding: The authors acknowledge that this work was supported by the Research Special Fund for PLA University of Science and Technology (KYJYZLXY1603–9, 40). The Research Innovation Program for College Graduates of Jiangsu Province (KYCX19_1471). The Research Fund for Postgraduate in Military (KYJXJQJY2001). The Natural Science Foundation of Jiangsu Province (2021).
Abstract
High-volume training followed by inadequate recovery may cause overtraining. This process may undermine the protective effect of regular exercise on the cardiovascular system and may increase the risk of pathological cardiac remodelling. We evaluated whether chronic overtraining changes cardiac-related microRNA profiles in the left and right ventricles. C57BL/6 mice were divided into the control, normal training, and overtrained by running without inclination, uphill running or downhill running groups. After an 8-week treadmill training protocol, the incremental load test and training volume results showed that the model had been successfully established. The qRT-PCR results showed increased cardiac miR-1, miR-133a, miR-133b, miR-206, miR-208b and miR-499 levels in the left ventricle of the downhill running group compared with the left ventricle of the control group. Similarly, compared with the control group, the downhill running induced increased expression of miR-21, miR-17–3p, and miR-29b in the left ventricle. Unlike the changes in the left ventricle, no difference in the expression of the tested miRNAs was observed in the right ventricle. Briefly, our results indicated that overtraining generally affects key miRNAs in the left ventricle (rather than the right ventricle) and that changes in individual miRNAs may cause either adaptive or maladaptive remodelling with overtraining.
Publication History
Received: 02 July 2020
Accepted: 17 June 2021
Article published online:
20 August 2021
© 2021. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).
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