Abstract 14501: Power Training Blunt the Decline in Systolic Ventricular Function in Elderly
Introduction: Few longitudinal interventional studies were designed to evaluate the impact of resistance training on cardiovascular system, and they reported that classical strength training did not improve cardiovascular function in elderly. However, resistance training can be designed with different regimens aiming to improve other functional aspects of motor function besides muscle strength, like power training.
Hypothesis: This study was designed to test the hypothesis that different resistance training regimens could result in different effects over cardiac morphology and function in elderly subjects.
Methods: Thirty-nine sedentary health elderly individuals were randomly allocated into 3 groups: Control (C: n=11, 63±1years), Strength Training (ST: n=13, 63±1years, 2x/week, 70-90% of 1RM), and Power Training (PT: n=15, 65±1years, 2x/week, 30-50% of 1RM, concentric phase performed as fast as possible). Before and after 16 weeks, all the subjects performed a resting transthoracic echodopplercardiogram to assess left ventricular dimensions, wall thickness, ejection fraction (EF) and fractional shortening (FS). ANOVA was used for inter-group comparisons, employing P<0.05 as significant (Newman-Keuls post-hoc test).
Results: After the interventions, values of volumes and diameters of the cavities and wall thickness were similar between the groups. When considering functional parameters, after training, the PT group showed an increment in EF and FS (+0.88±0.58% and +0.69±0.53%, respectively) that was significantly different from the pattern observed in the ST (-1.40±0.69% and -1.40±0.45%, respectively) and the C (-1.88±0.45% and -1.63±0.50%, respectively) groups.
Conclusions: Classical strength training did not change cardiovascular structure and function in elderly subjects, while power training abolished the decline in left ventricular systolic function.
- © 2011 by American Heart Association, Inc.