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논문분류	춘계학술대회 초록집
제목	Interdialytic Interval Dependent Alterations in Gait Dynamics in Hemodialysis Patients Assessed Using Wearable IMU Sensors
저자	Mi-Ji Jung
출판정보	2026; 2026(1):
키워드	Hemodialysis, Interdialytic instability, Mobility impairment, Gait dynamics, Interdialytic instability
초록	Objectives: Hemodialysis induces acute hemodynamic changes, while the long interdialytic interval may further influence physical stability. We evaluated both pre–post dialysis gait changes and interdialytic interval–dependent alterations using wearable inertial measurement unit (IMU) sensors. Methods: Forty-two maintenance hemodialysis patients (age 64.9 ± 12.7 years; 50% male) performed an 8-meter walk test before and after dialysis. IMU sensors attached to the waist and wrist captured activity and cadence parameters. In addition, gait characteristics were compared according to dialysis schedule (Monday/Tuesday vs Friday/Saturday) to assess the effect of long versus short interdialytic intervals within the same individuals. Results: Post-dialysis assessment demonstrated significant reductions in trunk rotational variability (GyrMag_Std, p<0.001; GyrMag_RMS, p=0.004) and dominant frequency (p=0.020), accompanied by increased vertical acceleration (az_RMS, p=0.003), suggesting reduced rotational control and increased vertical instability. Interdialytic interval analysis revealed that on the first dialysis day after the long interval (Monday/Tuesday), upper limb activity was lower while gait cadence was higher compared with the short-interval days (Friday/Saturday). This pattern indicates a compensatory, instability-prone gait characterized by reduced arm swing and increased stepping frequency. Conclusion: Hemodialysis patients exhibit both acute post-dialysis gait instability and interdialytic interval–dependent alterations in gait rhythm. Wearable IMU-based gait assessment may serve as a sensitive digital biomarker for detecting functional vulnerability and fall risk in this population.
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