Key result
Low capacity runner rats had lower baseline infarct size than high capacity runners (49% vs 68%), while local ischemic preconditioning significantly reduced infarct size in both phenotypes.
Why the study?
Aerobic capacity predicts cardiovascular mortality, but whether it influences myocardial ischemia and reperfusion injury was unknown.
Does ischemic preconditioning reduce infarct size in rats with different intrinsic aerobic capacities?
Population
Rats selectively bred for high or low capacity for treadmill running
Comparison
Control vs local ischemic preconditioning vs remote ischemic preconditioning
Design
Randomized preclinical isolated perfused heart study
Follow-up
120 minutes of reperfusion
Authors
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Rat models link lower aerobic capacity to smaller baseline infarcts; leaves open human translation of preconditioning across fitness phenotypes.
RCT (n=98)
Blinded analysis
Randomized
No
Does ischemic preconditioning reduce infarct size in rats with different intrinsic aerobic capacities?
Effect estimate: 47% reduction
Absolute Event Rate: 26% vs 49%
p-value: p=<0.01
Intrinsic low aerobic capacity is associated with reduced sensitivity to myocardial ischemia-reperfusion injury compared to high aerobic capacity, but both phenotypes derive similar cardioprotective benefits from local ischemic preconditioning.
Hjortbak et al. (2020) conducted an RCT in Ischemia-reperfusion injury (n=98). Local ischemic preconditioning (IPC) vs. Control was evaluated on Infarct size (percentage of area at risk) (47% reduction, p=<0.01). Low capacity runner rats had lower baseline infarct size than high capacity runners (49% vs 68%), while local ischemic preconditioning significantly reduced infarct size in both phenotypes.
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