Key result
Accelerometer-derived MX metrics correlate with better lower limb mobility and perception in adults post-PFF.
Why the study?
This study evaluated the association of cut-point-free MX metrics of physical activity intensity with common clinical tests in older adults recovering from proximal femoral fracture.
Do accelerometer-derived MX metrics correlate with standard clinical mobility tests in older adults recovering from proximal femoral fracture?
Observational (n=396)
Do accelerometer-derived MX metrics correlate with standard clinical mobility tests in older adults recovering from proximal femoral fracture?
Cut-point-free MX metrics from wearable accelerometers correlate well with standard clinical mobility assessments, highlighting their potential for setting personalized physical activity targets during proximal femoral fracture rehabilitation.
May support MX metrics for mobility monitoring in PFF rehab; hypothesis-generating and requires prospective validation.
Wearable and lightweight devices facilitate real-world physical activity (PA) assessments. MX metrics, as a cut-point-free parameter, evaluate acceleration above which the most active X minutes are accumulated. It provides insights into the intensity of PA over specific durations. This study evaluated the association of MX metrics and clinical tests in older adults recovering from proximal femoral fracture (PFF). Analyses were conducted on the PFF cohort from the baseline assessment of the Mobilise-D project using an accelerometer-based device. Participants (N = 396) were categorized into four recovery groups: acute, post-acute, extended recovery, and long-term recovery. Mobility capacity was assessed through the 6 min walking test (6MinWT), Short Physical Performance Battery (SPPB), 4-m walking test (4MWT), and hand grip (HG) strength. Mobility perception was evaluated using the Late-Life Function and Disability Instrument (LLFDI). Eight MX metrics (M1-M90) were calculated using the GGIR package in R. Results showed a moderate to strong positive correlation between M1 and M30 and lower limb mobility capacity tests and mobility perception (Lower Extremity domains) particularly in the extended and long-term recovery groups. MX metrics can be used for measuring PA intensity among older adults recovering from PFF. Hence, MX metrics have a high potential for clinical use as personalized PA targets in PFF rehabilitation.
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Younesian et al. (2025) conducted an observational in Proximal femoral fracture (n=396). MX metrics (accelerometer-based physical activity) was evaluated on Correlation between MX metrics and clinical mobility tests (6MinWT, SPPB, 4MWT, HG strength) and mobility perception (LLFDI). Accelerometer-derived MX metrics (M1 and M30) showed a moderate to strong positive correlation with lower limb mobility capacity and mobility perception in older adults recovering from PFF.
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