title: Interval and continuous exercise training produce similar increases in skeletal muscle and left ventricle microvascular density in rats.
abstract: Interval training (IT), consisting of alternated periods of high and low intensity exercise, has been proposed as a strategy to induce more marked biological adaptations than continuous exercise training (CT). The purpose of this study was to assess the effects of IT and CT with equivalent total energy expenditure on capillary skeletal and cardiac muscles in rats. Wistar rats ran on a treadmill for 30 min per day with no slope (0%), 4 times/week for 13 weeks. CT has constant load of 70% max; IT has cycles of 90% max for 1 min followed by 1 min at 50% max. CT and IT increased endurance and muscle oxidative capacity and attenuated body weight gain to a similar extent (P > 0.05). In addition, CT and IT similarly increased functional capillary density of skeletal muscle (CT: 30.6 ± 11.7%; IT: 28.7 ± 11.9%) and the capillary-to-fiber ratio in skeletal muscle (CT: 28.7 ± 14.4%; IT: 40.1 ± 17.2%) and in the left ventricle (CT: 57.3 ± 53.1%; IT: 54.3 ± 40.5%). In conclusion, at equivalent total work volumes, interval exercise training induced similar functional and structural alterations in the microcirculation of skeletal muscle and myocardium in healthy rats compared to continuous exercise training.
authors.affiliation: Laboratory of Cardiovascular Investigation, Oswaldo Cruz Institute, FIOCRUZ, 21040 900 Rio de Janeiro, RJ, Brazil ; Department of Physiology and Pharmacology, Fluminense Federal University, 24210 130 Niterói, RJ, Brazil.
authors.forename: Flávio
authors.initials: F
authors.lastname: Pereira
authors.affiliation: Laboratory of Cardiovascular Investigation, Oswaldo Cruz Institute, FIOCRUZ, 21040 900 Rio de Janeiro, RJ, Brazil ; Department of Physiology and Pharmacology, Fluminense Federal University, 24210 130 Niterói, RJ, Brazil.
authors.forename: Roger
authors.initials: R
authors.lastname: de Moraes
authors.affiliation: Laboratory of Cardiovascular Investigation, Oswaldo Cruz Institute, FIOCRUZ, 21040 900 Rio de Janeiro, RJ, Brazil ; Department of Physiology and Pharmacology, Fluminense Federal University, 24210 130 Niterói, RJ, Brazil.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Tibiriçá
authors.affiliation: Laboratory of Cardiovascular Investigation, Oswaldo Cruz Institute, FIOCRUZ, 21040 900 Rio de Janeiro, RJ, Brazil ; Department of Physiology and Pharmacology, Fluminense Federal University, 24210 130 Niterói, RJ, Brazil ; Laboratory of Exercise Sciences, Biomedical Institute, Fluminense Federal University, Rua Professor Hernani Pires de Mello 1001, Sala 106, 24210 130 Niterói, RJ, Brazil.
authors.forename: Antonio C L
authors.initials: AC
authors.lastname: Nóbrega
mesh_terms: D000818:Animals; D001775:Blood Circulation; D006352:Heart Ventricles; D006801:Humans; D018482:Muscle, Skeletal / Q000254:growth & development*; D010805:Physical Conditioning, Animal / Q000379:methods*; D051381:Rats