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 .
Injuries and adherence to walk/jog and resistance training programs in the elderly.
To evaluate the effects of 26 wk of aerobic and resistance training on the incidence of injury and program adherence in 70- to 79-yr-old men and women , 57 healthy volunteers ( 25 males , 32 females ) were r and omly assigned to a walk/jog ( W/J , N = 21 ) , strength ( STREN , N = 23 ) , or control ( CONT , N = 13 ) group . Walk/jog training was for 30 - 45 min , 3 d.wk-1 with intensity equal to 40 - 70 % heart rate max reserve ( HRmax reserve ) during the first 13 wk , and 75 - 85 % HRmax reserve for weeks 14 - 26 . STREN training consisted of one set ( 10 - 12 repetitions ) each of 10 variable resistance exercises performed to volitional fatigue . Forty-nine of the original participants completed the training program . Walk/jog training increased VO2max from 22.5 to 27.1 ml.kg-1.min-1 ( P less than or equal to 0.05 ) while STREN and CONT showed no change . STREN improved significantly in chest press and leg extension strength ( P less than or equal to 0.05 ) while W/J and CONT showed no change . Adherence to training was 20/23 ( 87 % ) and 17/21 ( 81 % ) in STREN and W/J , respectively . One repetition maximum ( 1-RM ) strength testing result ed in 11 injuries in the 57 subjects ( 19.3 % ) while STREN training result ed in only two injuries in 23 subjects ( 8.7 % ) . Walk training during weeks 1 - 13 result ed in one injury in 21 subjects ( 4.8 % ) . Eight of 14 subjects ( 57 % ) who began jogging intervals at week 14 incurred an injury : two of eight ( 25 % ) of the men and all of the women ( 6 of 6 ) . All W/J training injuries were to the lower extremity . ( ABSTRACT TRUNCATED AT 250 WORDS
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 .