PRT results in improvements to muscle strength and some aspects of functional limitation , such as gait speed , in older adults .
However , based on current data , the effect of PRT on physical disability remains unclear .
Further , due to the poor reporting of adverse events in trials , it is difficult to evaluate the risks associated with PRT
BACKGROUND The aim of this systematic review was to quantify the effectiveness of progressive resistance strength training ( PRT ) to reduce  physical disability in older people .
A controlled trial of circuit weight training on aerobic capacity and myocardial oxygen demand in men after coronary artery bypass surgery.
BACKGROUND Cardiovascular benefits of resistance training in cardiac patients have been suggested but not studied in a r and omized , controlled trial of circuit weight training ( CWT ) without an aerobic exercise component . The purpose of the current study was to examine the effects of 10 weeks of CWT on muscular strength , peak oxygen consumption ( peak VO2 ) , and myocardial oxygen dem and ( mVO2 ) in men after coronary artery bypass surgery . METHODS Twenty-six , post-coronary bypass male subjects ( mean 19 months after bypass ) , aged 60 + /- 8.5 years , were r and omly allocated to 10 weeks of CWT at 40 to 60 % of maximum voluntary contraction ( n = 12 ) or to a control group ( n = 14 ) . Muscular strength was assessed using a modified one repetition maximum technique .  Peak VO2 was recorded during symptom-limited treadmill exercise . Rate pressure product , as an indirect measure of mVO2 , was measured during isometric , isodynamic , and dynamic exercise . RESULTS No ischemic symptoms nor electrocardiographic changes were recorded during testing or training . Strength increased by 18 % ( P < 0.005 ) in five out of seven exercises in the training group , but was unchanged in the control group . Training did not improve peak VO2 . Rate pressure product during isometric and isodynamic exercise decreased from pre- to post-testing ( P < 0.05 ) but was equivalent to that seen in the control group . CONCLUSIONS Moderate intensity CWT is safe and can improve strength in selected low-risk patients after coronary artery bypass surgery . However , it does not significantly increase peak VO2 nor reduce mVO2 during isometric , isodynamic , and dynamic exercise
PRT results in improvements to muscle strength and some aspects of functional limitation , such as gait speed , in older adults .
However , based on current data , the effect of PRT on physical disability remains unclear .
Further , due to the poor reporting of adverse events in trials , it is difficult to evaluate the risks associated with PRT
BACKGROUND The aim of this systematic review was to quantify the effectiveness of progressive resistance strength training ( PRT ) to reduce  physical disability in older people .