RT Journal Article
SR Electronic
T1 Circuit weight training and cardiac morphology: a trial with magnetic resonance imaging
JF British Journal of Sports Medicine
JO Br J Sports Med
FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine
SP 141
OP 145
DO 10.1136/bjsm.2007.038281
VO 42
IS 2
A1 M D Camargo
A1 R Stein
A1 J P Ribeiro
A1 P R Schvartzman
A1 M O Rizzatti
A1 B D Schaan
YR 2008
UL http://bjsm.bmj.com/content/42/2/141.abstract
AB Background: Aerobic training (AT) and circuit weight training (CWT) improve peak oxygen uptake (VO2peak). During CWT the circulatory system is exposed to higher pressure, which could induce left ventricle morphological adaptations, possibly distinct from those derived from aerobic training.Objective: To compare the effects of aerobic training and CWT upon morphological and functional cardiac adaptations detected by magnetic resonance imaging.Methods: Twenty healthy sedentary individuals were randomly assigned to participate in a 12-week programme of aerobic training (n = 6), CWR (n = 7) or no intervention (n = 7, controls). Training programmes consisted of 36 sessions, 35 min each, 3 times per week, at 70% of maximal heart rate, and CWT included series of resistance exercises performed at 60% of 1 maximal repetition. Cardiopulmonary exercise testing and cardiac magnetic resonance imaging were performed before and after the intervention.Results: There was a similar improvement in VO2peak following aerobic training (mean (SD) increment: 12 (4)%) and CWT (12 (4)%), while there was no change in the control group. Aerobic training (12 (6)%) and CWT (16 (5)%) improved strength in the lower limbs, and only CWT resulted in improvement of 13 (4)% in the strength of the upper limbs. However, there were no detectable changes in left ventricular mass, end-diastolic volume, stroke volume or ejection fraction.Conclusion: In previously sedentary individuals, short-term CWT and aerobic training induce similar improvement in functional capacity without any adaptation in cardiac morphology detectable by cardiac magnetic resonance imaging.