The modified sphygmomanometer—An instrument to measure muscle strength: A validation study

Is the modified aneroid sphygmomanometer a valid instrument to measure isometric quadriceps strength? Three techniques were compared: the cuff method, in which the original cuff and bladder were folded then secured by rubber bands; the bag method, in which the folded bladder was secured in a sewn bag; and a standard method, employing weights. Using a design to control for method and order of measurement, five physiotherapists measured …