The purpose of this study was to compare the variations of weekly workload indices of internal and external load measures across the three weeks prior to injury occurrences in trail runners. Twenty-five trail runners (age: 36.23 ± 8.30 years old; body mass: 67.24 ± 5.97 kg; height: 172.12 ± 5.12 cm) were monitored daily for 52 weeks using global positioning systems (GPSs) to determine the total distance covered. Additionally, a rate of perceived exertion (RPE) scale was applied to determine session-RPE (sRPE: RPE multiplied by training time). The accumulated load (AL), acute: chronic workload ratio (ACWR), training monotony (TM), and training strain (TS) indices were calculated weekly for each runner. During the period of analysis, the injury occurrences were recorded. The differences were observed in AL and ACWR for sRPE and training time were significantly greater during the injury week when compared to the previous weeks. Similar evidence was found in TM and TS indices for sRPE, training time, and total distance. Furthermore, no meaningful differences were observed in AL and ACWR for total distance in the weeks prior to injury occurrence. Nevertheless, significant between-subjects variability was found, and this should be carefully considered. For that reason, an individualized analysis of the workload dynamics is recommended, avoiding greater spikes in load by aiming to keep a progressive increment of load without consequences for injury risk.

中文翻译：

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受伤前工作量指数的变化：对越野跑者的研究。

本研究的目的是比较越野跑者受伤前三周内部和外部负荷测量的每周负荷指数的变化。使用全球定位系统 (GPS) 每天对 25 名越野跑运动员（年龄：36.23 ± 8.30 岁；体重：67.24 ± 5.97 kg；身高：172.12 ± 5.12 cm）进行为期 52 周的监测，以确定总跑距离。此外，还应用感知劳累率 (RPE) 量表来确定训练期间 RPE（sRPE：RPE 乘以训练时间）。每周计算每位跑步者的累积负荷（AL）、急性：慢性负荷比（ACWR）、训练单调性（TM）和训练应变（TS）指数。在分析期间，记录了伤害发生情况。与前几周相比，在受伤周期间，sRPE 的 AL 和 ACWR 以及训练时间显着增加。在 sRPE、训练时间和总距离的 TM 和 TS 指数中也发现了类似的证据。此外，在受伤发生前几周内，AL 和 ACWR 的总距离没有观察到有意义的差异。然而，发现受试者之间存在显着差异，应仔细考虑这一点。因此，建议对工作负荷动态进行个性化分析，通过保持逐渐增加的负荷而不造成受伤风险来避免更大的负荷峰值。