Why the study?
Does endurance training reduce intrinsic heart rate in men at rest and during exercise?
Does endurance training reduce intrinsic heart rate in men at rest and during exercise?
Endurance training induces a non-autonomic bradycardia, likely related to cardiac enlargement, resulting in a lower intrinsic heart rate at rest and during exercise.
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Training-associated lower intrinsic HR may reflect non-autonomic effects; cross-sectional data leave causality open for prospective trials.
Lewis et al. (1980) studied this question.
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