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Article Abstract
Peak tibial acceleration (PTA) is commonly used to assess impact loading during running, but the number of strides required for reliable between-session measurement in overground conditions, as well as the minimal detectable difference (MDD), remains unclear. This study evaluated the one-week and three-week reliability of axial and resultant PTA during overground running and determined the minimum number of strides needed for good and excellent reliability. Eleven recreational runners completed three sessions on a 200-m indoor oval track while wearing a tibial-mounted accelerometer. PTA was analysed across different stride intervals, and test-retest reliability was assessed using intraclass correlation coefficients (ICC). Results showed moderate-to-good reliability for axial PTA (ICC = 0.71-0.80 at 1 week, 0.67-0.84 at 3 weeks) and moderate-to-excellent reliability for resultant PTA (ICC = 0.81-0.94 at 1 week, 0.78-0.91 at 3 weeks). Based on our results, we recommend averaging at least 40 strides to achieve good reliability for axial PTA (MDD = 2.93 g), and at least 100 strides to achieve excellent reliability of resultant PTA (MDD = 2.72 g). These findings support the reliability of PTA when evaluating longer-term interventions, such as gait retraining, but researchers should consider stride variability and track curvature when interpreting results.
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| http://dx.doi.org/10.1080/14763141.2025.2542274 | DOI Listing |
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