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 .
Effects of a quantitative progressive rehabilitation program applied unilaterally to the osteoarthritic knee.
Decreases in muscular strength , endurance , and angular velocity have previously been demonstrated in the elderly . Osteoarthritis ( OA ) , especially of the knee , may cause further reductions in these parameters and lead to functional limitations . This study measured the effects of a quantitative progressive exercise muscle rehabilitation program ( QPE ) that was added to a physical therapy ( PT ) program .  Forty subjects ( 20 men and 20 women ) with OA of the knees were r and omly selected from a group of volunteers ( N = 437 ) for the 3-month program . Measurements of strength , endurance , angular velocity , and the Jette Functional Status Index were determined before and after 1 , 2 , and 3 months of the program . The QPE program was composed of isometric , isotonic , isotonic with resistance , endurance , and speed contractions prescribed in a progressive sequence . Muscle strength ( 14 % and 29 % ) and endurance ( 38 % and 43 % ) increased significantly ( p < 0.05 , ANOVA for repeated measures ) for both the quadriceps and hamstrings , respectively , after rehabilitation . There were marked decreases in walking time and the difficulty and pain experienced during functional activities
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 .