Key result
Seven consecutive daily swims-to-exhaustion induce greater sarcotubular membrane disruption than a single swim.
Why the study?
Does single or repeated exhaustive exercise alter myocardial subcellular membrane structures in rats?
Population
Rats (n=15 total, n=5 per group)
Comparison
Single swim-to-exhaustion or seven consecutive… vs Sedentary control
Design
Preclinical, Randomly divided into three groups
Follow-up
Up to 7 days
Authors
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Repeated exhaustive exercise may heighten rat myocardial membrane injury; hypothesis-generating for human cardiac effects, requires validation before clinical consideration.
RCT (n=15)
Randomly divided
Does single or repeated exhaustive exercise alter myocardial subcellular membrane structures in rats?
p-value: p=<0.01
Exhaustive exercise in rats induces structural changes in myocardial sarcotubular membranes, providing a structural basis for previously observed reductions in calcium uptake.
Thomas et al. (1988) conducted an RCT in Myocardial integrity (n=15). Exhaustive exercise (swim-to-exhaustion) vs. Sedentary control was evaluated on Myocardial subcellular membrane structures (sarcolemmal, sarcotubular, and mitochondrial membranes) (p=<0.01). Seven consecutive daily swims-to-exhaustion resulted in a higher incidence of sarcotubular membrane disruption compared to a single swim (P<0.01), with both causing significant swelling.
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