Differences in the stride to stride variability while prolonged running on treadmill and track: A crossover study

Fewer studies have studied differences in Stride to stride variability (SSV) among runners, especially after prolonged running as a function of running surface. The aim of this study was to compare SSV while prolonged running on treadmill and track using inertial measurement units (IMU). Methods: Eleven runners (M9F2) were made to run on treadmill and track for 31 minutes at their preferred speed. Duration of gait cycle (DGC), total range of motion (TROM), maximum and minimum joint ranges of Hip, Knee and Ankle joints in the sagittal plane movements were measured using 7 IMUs. Mean and coefficient of variation (CV) of each parameter in initial and last 5 min (T1 and T2) were compared between the treadmill and track running. Results: There were no significant differences in DGC either between two-time intervals or treadmill and track running. In T2, left hip mean maximum flexion was significantly higher (p<0.05) while left knee mean TROM, right ankle CV of maximum plantarflexion and TROM were significantly lower (p<0.05) as compared to T1. While track running, left hip mean maximum extension and TROM and right hip maximum hip extension, flexion and TROM, left knee CV of the maximum flexion in swing phase were significantly higher (p<0.05) while right ankle CV of TROM was significantly lower (p<0.05) as compared to treadmill running.

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