Measurements of tibial acceleration during running must be reliable to ensure valid results and reduce errors. The purpose of this study was to determine the reliability and minimal detectable difference (MDD) of peak axial and peak resultant tibial acceleration during overground and treadmill running. The authors also compared reliability and MDDs when peak tibial accelerations were determined by averaging 5 or 10 trials. Tibial acceleration was measured during overground and treadmill running of 19 participants using a lightweight accelerometer mounted to the tibia. Peak axial and peak resultant tibial accelerations were determined for each trial. Intraclass correlation coefficients determined within-session reliability, and MDDs were also calculated. Within-session reliability was excellent for all conditions (intraclass correlation coefficients = .95–.99). The MDDs ranged from 0.6 to 1.4 g for peak axial acceleration and from 1.6 to 2.0 g for peak resultant acceleration and were lowest for peak axial tibial acceleration during overground running. Averaging 10 trials did not improve reliability compared to averaging 5 trials but did result in small reductions in MDDs. For peak axial tibial acceleration only, lower MDDs indicate that overground running may be the better option for detecting small differences.

跑步过程中胫骨加速度的测量必须可靠，以确保结果有效并减少误差。本研究的目的是确定地上跑步和跑步机跑步期间峰值轴向加速度和峰值合成胫骨加速度的可靠性和最小可检测差异 (MDD)。作者还比较了通过平均 5 或 10 次试验来确定峰值胫骨加速度时的可靠性和 MDD。使用安装在胫骨上的轻型加速度计测量了 19 名参与者在地面和跑步机上跑步时的胫骨加速度。每次试验均确定峰值轴向加速度和峰值合成胫骨加速度。组内相关系数确定了会话内的可靠性，并且还计算了 MDD。在所有条件下，会话内可靠性都非常出色（组内相关系数 = .95–.99）。MDD 的范围为：峰值轴向加速度为 0.6 至 1.4 g，峰值合成加速度为 1.6 至 2.0 g，地上跑期间峰值轴向胫骨加速度最低。与平均 5 次试验相比，平均 10 次试验并没有提高可靠性，但确实导致 MDD 小幅降低。仅对于峰值轴向胫骨加速度，较低的 MDD 表明地上跑步可能是检测微小差异的更好选择。