Key result
Exercise training in HFpEF rats reduced brain stem oxidative stress, improved cardiac autonomic balance, reduced arrhythmogenesis, and yielded a threefold improvement in cardiac function.
Why the study?
Does exercise training improve brain stem oxidative stress, cardiac autonomic control, arrhythmogenesis, and cardiac function in rats with HFpEF?
RCT (n=30)
Randomly allocated
Does exercise training improve brain stem oxidative stress, cardiac autonomic control, arrhythmogenesis, and cardiac function in rats with HFpEF?
Answers are grounded in this paper and cite their sources.
Moderate-intensity exercise training attenuates the progression of HFpEF in a rat model by improving RVLM redox state, cardiac autonomic control, and cardiac function.
Chronic heart failure is characterized by autonomic imbalance, cardiac dysfunction, and arrhythmogenesis. It has been shown that exercise training (ExT) improves central nervous system oxidative stress, autonomic control, and cardiac function in heart failure with reduced ejection fraction; however, to date no comprehensive studies have addressed the effects of ExT, if any, on oxidative stress in brain stem cardiovascular areas, cardiac autonomic balance, arrhythmogenesis, and cardiac function in heart failure with preserved ejection fraction (HFpEF). We hypothesize that ExT reduces brain stem oxidative stress, improves cardiac autonomic control and cardiac function, and reduces arrhythmogenesis in HFpEF rats. Rats underwent sham treatment or volume overload to induce HFpEF. ExT (60 min/day, 25 m/min, 10% inclination) was performed for 6 wk starting at the second week after HFpEF induction. Rats were randomly allocated into Sham+sedentary (Sed) ( n = 8), Sham+ExT ( n = 6), HFpEF+Sed ( n = 8), and HFpEF+ExT ( n = 8) groups. Compared with the HFpEF+Sed condition, HFpEF+ExT rats displayed reduced NAD(P)H oxidase activity and oxidative stress in the rostral ventrolateral medulla (RVLM), improved cardiac autonomic balance, and reduced arrhythmogenesis. Furthermore, a threefold improvement in cardiac function was observed in HFpEF+ExT rats. These novel findings suggest that moderate-intensity ExT is an effective means to attenuate the progression of HFpEF through improvement in RVLM redox state, cardiac autonomic control, and cardiac function. NEW & NOTEWORTHY In the present study, we found that exercise reduced oxidative stress in key brain stem areas related to autonomic control, improved sympathovagal control of the heart, reduced cardiac arrhythmias, and delayed deterioration of cardiac function in rats with heart failure with preserved ejection fraction (HFpEF). Our results provide strong evidence for the therapeutic efficacy of exercise training in HFpEF.
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Andrade et al. (2017) conducted an RCT in Heart failure with preserved ejection fraction (HFpEF) (n=30). Exercise training (ExT) vs. Sedentary (Sed) was evaluated on Brain stem oxidative stress, cardiac autonomic control, arrhythmogenesis, and cardiac function. Exercise training in HFpEF rats reduced brain stem oxidative stress, improved cardiac autonomic balance, reduced arrhythmogenesis, and yielded a threefold improvement in cardiac function.
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