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 .
Body composition in elderly men: effect of dietary modification during strength training.
OBJECTIVE To assess how dietary change affects gain in strength and muscle mass during heavy resistance training of elderly men . DESIGN R and omized controlled trial . INTERVENTION During 12 weeks of resistance training of knee extensors and flexors , a daily supplement of 560 + /- 16 kcal/day ( 17 % energy from protein , 43 % from carbohydrate , 40 % from fat ) was r and omly assigned to six men ( S ) while five men ( U ) received no supplement .  Food intake , strength , whole body composition , and midthigh composition by CT scan were assessed before training and at 6 and 12 weeks . SETTING The men were out patients but lived in a Metabolic Research Unit during the three assessment s. PARTICIPANTS Eleven healthy men aged 61 to 72 years . RESULTS Densitometry showed no change over time in fat or fat-free mass . However , the S men increased ( P less than 0.05 ) weight , skinfold thickness at six sites , subcutaneous midthigh fat , and creatinine excretion ; in all men , changes in these values and in midthigh muscle were proportional to changes in reported energy intake ( P less than 0.05 ) . There was midthigh muscle hypertrophy in both groups , but it was greater in S than U ( P less than 0.01 ) . Both groups gained strength ( P less than 0.001 ) with no effect of diet . CONCLUSIONS During physical rehabilitation of the elderly , dietary intake may influence the increase in lean as well as adipose tissue without altering strength gain . These preliminary findings should be confirmed by a larger study with sedentary controls
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 .