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 .
Physical activity program for older persons: effect on balance, strength, neuromuscular control, and reaction time.
Regular exercise has been recommended to improve balance , strength , and coordination in older persons . In this study , 44 persons , aged 50 to 75 years ( mean 62.4 yrs ) underwent assessment s of quadriceps strength , reaction time , neuromuscular control , and body sway on two occasions before beginning a 10-week exercise program . The subjects were retested for the same measures at the end of the program . The mean number of classes attended for the 40 subjects who were retested was 16.2 ( range 11 to 19 ) . On completion of the program , the subjects showed improved performance in the tests of quadriceps strength , reaction time , body sway on a firm surface with the eyes closed , and a compliant surface with the eyes open and closed . In contrast , a group of nonexercisers showed no improvements in any of the test measures . These results suggest that exercise may play a role in improving a number of sensorimotor systems that contribute to stability in older persons
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 .