Midlife mobility assessment from the pocket: agreement and consistency between smartphone placement configurations

Subtle declines in mobility may emerge during midlife and can be detected using smartphone-based motion measures. Instrumented assessment of balance and functional tasks commonly uses lower-back placement, which requires device fixation and may limit convenient real-world monitoring. This study compared mobility outcomes obtained from a practical front-pocket/thigh placement with those from a standardized lower-back placement during static balance, sit-to-stand (STS), and Timed Up and Go (TUG) tests. Forty-six adults aged 40-64 years completed static balance, 30-second STS, and TUG assessments

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