Key result
Nine weeks of high-speed interval running increased cardiac enlargement and myofibrillar ATPase activity by 15% in rats, whereas steady-state running produced only transient, non-significant changes.
Authors
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Does not support changing exercise prescriptions; leaves open whether interval running yields superior cardiac adaptations in humans.
Baldwin et al. (1977) studied Healthy rats (exercise physiology). High-speed interval running vs. Chronic steady-state running was evaluated on Biochemical properties of cardiac and skeletal muscle fiber types. Nine weeks of high-speed interval running increased cardiac enlargement and myofibrillar ATPase activity by 15% in rats, whereas steady-state running produced only transient, non-significant changes.
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