In spite of the growing use of motion sensors, particularly accelerometers, for the measurement of physical activity in high-income countries, virtually all population-based physical activity studies from low- and middle-income countries (LMICs) still rely on self-report. In addition to the well known financial aspect of this inequality, availability of trained personnel is another challenge in LMICs. Also, less widely known barriers, such as importation regulations also play a role. The measurement of physical activity in LMICs is particularly challenging. ...
