Biomechanics Laboratory, School of Physical Education and Sports Science at Thessaloniki, Aristotle University of Thessaloniki, Thessaloniki, Greece.
R&D, Kinvent - Biomechanique, Montpellier, France.
Scand J Med Sci Sports. 2024 Aug;34(8):e14709. doi: 10.1111/sms.14709.
We explored the impact of running in the severe intensity domain on running mechanics and muscle oxygenation in competitive runners by investigating the relationship between mechanical deviations from typical stride characteristics and muscle oxygen saturation (SmO) in the quadriceps muscle. Sixteen youth competitive runners performed an 8-min exhaustive running test on an outdoor track. Running mechanics were continuously monitored using inertial measurement units. Rectus femoris SmO and total hemoglobin (a measure of blood volume) were continuously monitored by near-infrared spectroscopy. One-class support vector machine (OCSVM) modeling was employed for subject-specific analysis of the kinematic data. Statistical analysis included principal component analysis, ANOVA, and correlation analysis. Mechanical deviations from typical stride characteristics increased as the running test progressed. Specifically, the percentage of outliers in the OCSVM model rose gradually from 2.2 ± 0.8% at the start to 43.6 ± 28.2% at the end (p < 0.001, mean ± SD throughout). SmO dropped from 74.3 ± 8.4% at baseline to 10.1 ± 6.8% at the end (p < 0.001). A moderate negative correlation (r = -0.61, p = 0.013) was found between the average SmO and the percentage of outlier strides during the last 15% of the run. During high-intensity running, alterations in running biomechanics may occur, linked to decreased quadriceps muscle oxygenation. These parameters highlight the potential of using running kinematics and muscle oxygenation in training to optimize performance and reduce injury risks. Our research contributes to understanding biomechanical and physiological responses to endurance running and emphasizes the importance of individualized monitoring.
我们通过研究跑步力学与股四头肌肌肉氧饱和度（SmO）之间的关系，探讨了在剧烈强度范围内跑步对竞技跑者跑步力学和肌肉氧合的影响。16 名青年竞技跑者在户外跑道上进行了 8 分钟的耗竭性跑步测试。使用惯性测量单元连续监测跑步力学。近红外光谱连续监测股直肌 SmO 和总血红蛋白（血液量的一种测量方法）。采用单类支持向量机（OCSVM）模型对运动学数据进行个体分析。统计分析包括主成分分析、方差分析和相关性分析。典型步幅特征的力学偏差随着跑步测试的进行而增加。具体来说，OCSVM 模型中的离群值百分比从开始时的 2.2±0.8%逐渐增加到结束时的 43.6±28.2%（p<0.001，平均值±标准差，全程）。SmO 从基线时的 74.3±8.4%下降到结束时的 10.1±6.8%（p<0.001）。在最后 15%的跑步过程中，平均 SmO 与离群步的百分比之间存在中度负相关（r=-0.61，p=0.013）。在高强度跑步时，跑步生物力学可能会发生变化，这与股四头肌氧合减少有关。这些参数突出了在训练中使用跑步运动学和肌肉氧合来优化表现和降低受伤风险的潜力。我们的研究有助于理解耐力跑步的生物力学和生理反应，并强调了个体化监测的重要性。
