Vertical Loading Rate Is Not Associated with Running Injury, Regardless of Calculation Method.
Vertical Loading Rate Is Not Associated with Running Injury, Regardless of Calculation Method.
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DOI：
10.1249/mss.0000000000002917
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发表时间：
2022-08-01
影响因子：
4.1
通讯作者：
Heiderscheit BC
中科院分区：
文献类型：
--
作者：
Schmida EA;Wille CM;Stiffler-Joachim MR;Kliethermes SA;Heiderscheit BC
载荷率（LR），即垂直地面反力（vGRF）的斜率，通常用于评估跑步相关伤害风险。然而，LR与跑步相关损伤（包括骨应力损伤（BSI））之间的关系尚不清楚。现有的多种LR计算方法及其在不同运行速度下的应用可能导致结果不一致。评估计算方法和跑步速度对LR值的影响，确定健康跑步时的LR与随后的损伤之间的关系。收集了4个赛季（2015-2019）I级越野运动员（n = 79）在2.68 m/s、首选训练配速和4.47 m/s下的健康季前赛跑步数据和随后的受伤记录。每个速度下的LR通过四种方式计算：1)最大和2)冲击峰值（IP）时vGRF震级20-80%的平均斜率，3)从初始接触到IP的平均斜率，4)站姿时间3 - 12%的平均斜率。线性混合效应模型和广义估计方程用于评估LR关联。LR值因速度和计算方法而异（p值< 0.001）。在vGRF的20-80%处，最大坡度为4.47 m/s，产生的LR估计值最高，从初始接触到IP的平均坡度为2.68 m/s，产生的LR估计值最低。观察到64例损伤（20例BSI）。在任何计算方法中，LR与所有损伤或BSI之间均未发现显著关联（p值≥0.13）。计算方法和运行速度导致LR值有显著差异。无论采用何种计算方法，均未发现LR与随后的损伤之间存在关联。因此，健康的基线LR可能无助于前瞻性评估与跑步相关的损伤风险。
Loading rate (LR), the slope of the vertical ground reaction force (vGRF), is commonly used to assess running-related injury risk. However, the relationship between LR and running-related injuries, including bone stress injuries (BSI), is unclear. Inconsistent findings may result from the numerous LR calculation methods that exist and their application across different running speeds. Assess the influence of calculation method and running speed on LR values and determine the association of LR during healthy running with subsequent injury. Healthy preseason running data and subsequent injury records from Division I cross country athletes (n = 79) over four seasons (2015–2019) at 2.68 m/s, preferred training pace, and 4.47 m/s were collected. LR at each speed was calculated four ways: 1) maximum and 2) average slope from 20–80% of vGRF magnitude at impact peak (IP), 3) average slope from initial contact to IP, and 4) average slope from 3–12% of stance time. Linear mixed effects models and generalized estimation equations were used to assess LR associations. LR values differed depending on speed and calculation method (p-value < 0.001). The maximum slope from 20–80% of the vGRF at 4.47 m/s produced the highest LR estimate and the average slope from initial contact to IP at 2.68 m/s produced the lowest. Sixty-four injuries (20 BSI) were observed. No significant association was found between LR and all injuries or BSI across any calculation method (p-values ≥ 0.13). Calculation method and running speed result in significantly different LR values. Regardless of calculation method, no association between LR and subsequent injury was identified. Thus, healthy baseline LR may not be useful to prospectively assess running-related injury risk.