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 .
Resistance and aerobic training in older men: effects on VO2peak and the capillary supply to skeletal muscle.
Both aerobic training ( AT ) and resistance training ( RT ) may increase aerobic power ( VO2peak ) in the older population ; however , the role of changes in the capillary supply in this response has not been evaluated . Twenty healthy men ( age 65 - 74 yr ) engaged in either 9 wk of lower body RT followed by 9 wk of AT on a cycle ergometer ( RT-->AT group ) or 18 wk of AT on a cycle ergometer ( AT-->AT group ) . RT was performed three times per week and consisted of three sets of four exercises at 6 - 12 repetitions maximum . AT was performed three times per week for 30 min at 60 - 70 % heart rate reserve . VO2peak was increased after both RT and AT ( P < 0.05 ) . Biopsies ( vastus lateralis ) revealed that the number of capillaries per fiber perimeter length was increased after both AT and RT ( P < 0.05 ) , paralleling the changes in VO2peak , whereas capillary density was increased only after AT ( P < 0.01 ) . These results , and the finding of a significant correlation between the change in capillary supply and VO2peak ( r = 0.52 ) , suggest the possibility that similar mechanisms may be involved in the increase of VO2peak after high-intensity RT and AT in the older population
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 .