I work for a company that makes supplied-air hazmat suits. A product we need to test is a breather helmet with a built in ventilation fan. OSHA requires we test the device with human subjects, male and female. Our plan is to put them on a tread mill and run them up to several cardio levels, based on HR, then test for CO2 levels inside the respirator at each level.
My question is do HRM chest straps work in the presence of under-wire bras? We will be using some female employees as test subjects, and do not want to have to dictate to them what kind of undergarments to wear.