What is Known:
• Accelerometers are fast becoming the most widely used measure of physical activity in public health research.
• The GENEActive wrist worn accelerometer has been validated for use with children aged 8 years and older
What is New:
• The GENEActive wrist worn accelerometer can be used to assess physical activity in children aged 5–8 years old.
• Previously established cut-points for the GENEActiv accelerometer can be used in children aged 5–8 years old to distinguish sedentary behaviour, moderate and vigorous PA behaviour.