Gait variability and fatigability during a simulated 10-km running race in trained runners.

IF 2.8 3区医学 Q2 PHYSIOLOGY

European Journal of Applied Physiology Pub Date : 2025-04-21 DOI:10.1007/s00421-025-05780-8

Johnny Padulo, Marta Borrelli, Andrea Antiglio, Fabio Esposito

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Abstract

Purpose: Fatigue is an inevitable phenomenon during distance running, leading to the adoption of altered gait patterns by runners. Therefore, the aim of this study was to investigate the changes in gait variability and fatigability in distance runners over a 10-km running race.

Methods: For this aim, 12 runners (36.5 ± 5.4 y) completed a simulated 10-km running race. Throughout the trial, heart rate (HR) and rate perceived exertion (RPE, CR-10) were analyzed. In addition, kinematic/kinetic measurements: contact time (CT), flight time (FT), step length (SL), stride time (ST) leg (k_vert) and vertical (k_leg) stiffness, were recorded. Gait variability including phase coordination index (PCI) was calculated for each 2-km segment.

Results: HR increased (from 88.46 ± 5.84 to 93.87 ± 6.48 %HR_MAX, P < 0.05) as well as RPE (6.58 ± 0.47-8.96 ± 0.40 a.u., P < 0.001) as the distance increased. Conversely, no differences between running segments for the kinematic/kinetic data (CT-FT-SL-ST-k_vert-k_leg) were observed over five 2 km. However, there was increase (P < 0.05) in gait variability (PCI), over the course of the running race. Furthermore, the determination coefficient (R²) was found as strong and very strong when compared five (0-10 km) and four (4-10 km) running segments between HR-RPE and PCI (R² = 0.623-0.845).

Conclusion: These results suggest that the gait variability is one mechanical determinant in assessing the neuromuscular output when the fatigability increases during a running race.

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经过训练的跑步者在模拟10公里跑步比赛中的步态变异性和疲劳。

目的：疲劳是长跑中不可避免的现象，导致跑步者采用改变的步态模式。因此，本研究的目的是研究长跑运动员在10公里跑步比赛中步态变异性和疲劳的变化。方法：为此，12名跑步者（36.5±5.4 y）完成了10公里的模拟跑步比赛。在整个试验过程中，分析心率（HR）和感知运动率（RPE, CR-10）。此外，还记录了运动学/动力学测量：接触时间（CT）、飞行时间（FT）、步长（SL）、步幅时间（ST）、腿（kvert）和垂直（kleg）刚度。步态变异性包括相位协调指数（PCI）计算每2公里段。结果：在5个2 km范围内HRMAX从88.46±5.84增加到93.87±6.48% （P vert-kleg）。然而，当HR-RPE和PCI在5个（0-10公里）和4个（4-10公里）跑步段进行比较时，两者之间的增加（R2 = 0.623-0.845）很强或很强。结论：这些结果表明，步态变异性是评估跑步过程中疲劳增加时神经肌肉输出的一个机械决定因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

European Journal of Applied Physiology 医学-生理学

CiteScore

6.00

自引率

6.70%

发文量

227

审稿时长

3 months

期刊介绍： The European Journal of Applied Physiology (EJAP) aims to promote mechanistic advances in human integrative and translational physiology. Physiology is viewed broadly, having overlapping context with related disciplines such as biomechanics, biochemistry, endocrinology, ergonomics, immunology, motor control, and nutrition. EJAP welcomes studies dealing with physical exercise, training and performance. Studies addressing physiological mechanisms are preferred over descriptive studies. Papers dealing with animal models or pathophysiological conditions are not excluded from consideration, but must be clearly relevant to human physiology.