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 .
Strength training can improve steadiness in persons with essential tremor.
We evaluated the effect of a strength-training program on the ability of persons with essential tremor  to exert steady forces with the index finger . Thirteen subjects with a diagnosis of essential tremor were assigned to three different groups : one group trained with heavy loads , one with light loads , and one did not perform any training . Subjects attempted to generate steady contractions during both postural and constant-force tasks . Steadiness was quantified by the root mean square amplitude of acceleration during postural tasks and the st and ard deviation and coefficient of variation of force during the constant-force tasks . Subjects who performed the training program with heavy loads experienced an increase in steadiness around the target force during the constant-force tasks . Subjects in the other two groups did not exhibit any changes . These findings suggest that strength training can decrease the magnitude of tremor . However , we did not observe any associated improvements in functional abilities
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 .