The Korean Journal of Physiology and Pharmacology

The Korean Society of Pharmacology (대한약리학회)
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Protective effect of low-intensity treadmill exercise against acetylcholine-calcium chloride-induced atrial fibrillation in mice

  • Sung, Dong-Jun (Department of Sport and Health Studies, College of Biomedical and Health Science, Konkuk University) ;
  • Jeon, Yong-Kyun (Department of Physical Education at the Graduate School of Education, Dankook University) ;
  • Choi, Jaeil (Department of Physical Education at the Graduate School of Education, Dankook University) ;
  • Kim, Bokyung (Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine) ;
  • Golpasandi, Shadi (Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine) ;
  • Park, Sang Woong (Department of Emergency Medical Services, College of Health Sciences, Eulji University) ;
  • Oh, Seung-Bum (Department of Sport and Health Studies, College of Biomedical and Health Science, Konkuk University) ;
  • Bae, Young Min (Department of Physiology, KU Open Innovation Center, Research Institute of Medical Science, Konkuk University School of Medicine)
  • Received : 2022.04.05
  • Accepted : 2022.07.21
  • Published : 2022.09.01
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Abstract

Atrial fibrillation (AF) is the most common supraventricular arrhythmia, and it corresponds highly with exercise intensity. Here, we induced AF in mice using acetylcholine (ACh)-CaCl2 for 7 days and aimed to determine the appropriate exercise intensity (no, low, moderate, high) to protect against AF by running the mice at different intensities for 4 weeks before the AF induction by ACh-CaCl2. We examined the AF-induced atrial remodeling using electrocardiogram, patch-clamp, and immunohistochemistry. After the AF induction, heart rate, % increase of heart rate, and heart weight/body weight ratio were significantly higher in all the four AF groups than in the normal control; highest in the high-ex AF and lowest in the low-ex (lower than the no-ex AF), which indicates that low-ex treated the AF. Consistent with these changes, G protein-gated inwardly rectifying K+ currents, which were induced by ACh, increased in an exercise intensity-dependent manner and were lower in the low-ex AF than the no-ex AF. The peak level of Ca2+ current (at 0 mV) increased also in an exercise intensity-dependent manner and the inactivation time constants were shorter in all AF groups except for the low-ex AF group, in which the time constant was similar to that of the control. Finally, action potential duration was shorter in all the four AF groups than in the normal control; shortest in the high-ex AF and longest in the low-ex AF. Taken together, we conclude that low-intensity exercise protects the heart from AF, whereas high-intensity exercise might exacerbate AF.

Keywords

Acknowledgement

This paper was supported by Konkuk University in 2020.

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