What is the criterion validity of the FitBit Flex™ in measuring steps compared to the ActiGraph’s Bluetooth® S

/What is the criterion validity of the FitBit Flex™ in measuring steps compared to the ActiGraph’s Bluetooth® Smart wGT3X-BT over 24 hours in healthy adults?

Research Question

What is the criterion validity of the FitBit Flex™ in measuring steps compared to the ActiGraph’s Bluetooth® Smart wGT3X-BT over 24 hours in healthy adults?

2026