The effects of daily exercise on susceptibility to sudden cardiac death.
Why the study?
Does a 6-week daily exercise program prevent ventricular fibrillation induced by acute myocardial ischemia in dogs with healed myocardial infarction?
Population
Chronically instrumented dogs with a healed anterior wall myocardial infarction, previously tested for…
Comparison
6-week daily exercise program vs Equal 6-week period of rest
Design
Preclinical
Follow-up
6 weeks
Authors
Discussion
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Implication
Exercise may protect against ischemia-induced VF in this canine model; hypothesis-generating and leaves open human SCD prevention.
Key Points
- The study aims to evaluate how daily exercise influences the risk of sudden cardiac death following coronary occlusion.
- Conducted on chronically instrumented dogs with healed anterior wall myocardial infarction
- Dogs were divided into susceptible (developing ventricular fibrillation) and resistant groups
- Susceptible and resistant dogs underwent a 6-week daily exercise program with subsequent baroreflex evaluation.
- None of the exercising susceptible dogs developed ventricular fibrillation after re-testing, while most rested susceptible dogs did (8 out of 8)
- Exercise improved baroreflex function in susceptible dogs (change in heart rate: -60.8 beats/min) compared to before exercise (-15.3 beats/min), p<0.001
- Rest did not improve baroreflex function in susceptible dogs (27.4 beats/min after rest)
Structured PICO
Does a 6-week daily exercise program prevent ventricular fibrillation induced by acute myocardial ischemia in dogs with healed myocardial infarction?
P
Population
Chronically instrumented dogs with a healed anterior wall myocardial infarction, previously tested for susceptibility to ventricular fibrillation during an exercise plus ischemia test.
I
Intervention
6-week daily exercise program
C
Comparator
Equal 6-week period of rest
O
Outcome
Development of ventricular fibrillation (VF) during an exercise plus ischemia testhard clinical
Daily exercise prevents ventricular fibrillation induced by acute myocardial ischemia in a canine model susceptible to sudden cardiac death, likely by improving autonomic control.
Cite This Study
Billman et al. (1984) studied this question.