PRT had a large positive effect on strength ( 41 trials , 1955 participants ) , but there was statistical heterogeneity that was not explained by differences in study quality , participant characteristics or the exercise program .
REVIEW ER 'S CONCLUSIONS PRT appears to be an effective intervention to increase strength in older people and has a positive effect on some functional limitations .
However , the effect of this intervention on more substantive outcomes such as measures of disability or HRQOL remains unclear .
BACKGROUND Muscle weakness in old age , is associated with physical disability and an increased risk of falls .
Progressive resistance strength ( PRT ) training exercises ( i.e. movements performed against a specific external force that is regularly increased during training ) are design ed to increase strength in older people .
OBJECTIVES To assess the effect of PRT on measures of physical disability , functional limitation and impairment in older people  , and identify adverse events .
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 had a large positive effect on strength ( 41 trials , 1955 participants ) , but there was statistical heterogeneity that was not explained by differences in study quality , participant characteristics or the exercise program .
REVIEW ER 'S CONCLUSIONS PRT appears to be an effective intervention to increase strength in older people and has a positive effect on some functional limitations .
However , the effect of this intervention on more substantive outcomes such as measures of disability or HRQOL remains unclear .
BACKGROUND Muscle weakness in old age , is associated with physical disability and an increased risk of falls .
Progressive resistance strength ( PRT ) training exercises ( i.e. movements performed against a specific external force that is regularly increased during training ) are design ed to increase strength in older people .
OBJECTIVES To assess the effect of PRT on measures of physical disability , functional limitation and impairment in older people  , and identify adverse events .