Walking is the most common form of human movement, and a safe and efficient gait is a prerequisite for independence across the life span. Careful interpretation is required when using the Health app in children and when measuring DST in general, as both have shown limited validity and/or reliability. The Health app on iPhone is reliable and valid for measuring GS and SL in adults and seniors. Consistency between repeated measurements was good to excellent for all gait parameters in adults/seniors, and moderate to good for GS and DST but poor for SL in children. Agreement of the Health App with the APDM Mobility Lab was good for GS in all age groups and for SL in adults/seniors, but poor to moderate for DST in all age groups and for SL in children. Test–retest reliability was assessed via a second iPhone-instrumented 6MWT 1 week later. Gait parameters were simultaneously collected with an inertial sensors system (APDM Mobility Lab) to assess concurrent validity. Gait speed (GS), step length (SL), and double support time (DST) were extracted from the gait recordings of the Health app. Twenty-seven children, 28 adults and 28 seniors equipped with an iPhone completed a 6-min walk test (6MWT). This study assessed the concurrent validity and test–retest-reliability of the Apple Health app on iPhone for measuring gait parameters in different age groups.
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