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 .
Effect of exercise intensity on bone density, strength, and calcium turnover in older women.
PURPOSE This study examined the effects of 24 wk of high intensity strength training or low intensity walking on lumbar bone mineral density ( BMD ) , muscular strength , and calcium turnover in Australian women either taking hormone replacement therapy ( HRT ) or not taking HRT .  METHODS A subject pool of 64 women between 45 - 65 yr and r and omly allocated into weights ( N = 21 ) , walking ( N = 20 ) , weightsHRT ( N = 14 ) , and walkingHRT ( N = 9 ) groups completed this study . All subjects trained twice weekly in either a 50-min walking or weight-training program ( 60 - 90 % IRM ) . Measurements included maximal isometric knee strength , IRM bench press , IRM squat , isokinetic back strength , lumbar ( L2-L4 ) BMD , serum osteocalcin , and urinary deoxypyridinoline crosslinks ( Dpd ) . RESULTS No significant group differences in BMD were evident at the completion of training . However , a significant ( P < 0.05 ) within group change was apparent for the walking group since BMD decreased 1.3 % below baseline testing . Osteocalcin levels increased significantly ( P < 0.05 ) in the walking ( 22 % ) group . Maximal bench press and squat strength improved significantly ( P < 0.05 ) in the weights ( 25.8 % and 37.7 % ) and weightsHRT ( 25.4 % and 35.7 % ) groups . The weights group also increased significantly ( P < 0.05 ) in isokinetic back strength ( 22.2 % ) . CONCLUSION It was concluded that short-term high intensity resistance training provides an effective means for increasing muscular strength in women between 45 and 65 yr . The training effects on lumbar BMD were not apparent in the present study
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 .