在跑步机运行期间,空气阻力调节水平地面反应力
Jared R Steele1, Luke VanKeersbilck1, Iain Hunter1
1Department of Exercise Sciences, Brigham Young University, Provo, UT, USA.
Journal of biomechanics
|October 24, 2025
概括
跑步者通过调整地面反应力,增加推进力和减少制动力来适应空气阻力,特别是在更快的速度下. 这凸显了在跑步机跑步研究中模拟空气流量的重要性.
科学领域:
- 生物力学 生物力学
- 运动生理学 运动生理学
- 运动科学 运动科学 运动科学
背景情况:
- 空气阻力对运行经济和性能产生重大影响,特别是在地面运行时.
- 了解跑步者如何适应气动力学力量对于优化训练和表现策略至关重要.
- 以前的研究还没有完全阐明由于跑步机运行时的空气流导致的地面反应力 (GRF) 和时空参数的具体变化.
研究的目的:
- 为了研究模拟空气阻力 (正风和尾风) 在恒定速度跑步机运行过程中对GRF和步伐特征的影响.
- 为了确定跑步者是否主要改变前后 (AP) GRF或垂直负载和时空参数以抵消空气阻力.
- 为了比较不同气流条件 (前风,尾风,没有风) 和运行速度对运行生物力学的影响.
主要方法:
- 24名训练有素的男性跑步者在跑步机上以两种速度 (3.35和4.46米/秒) 在四种空气流条件下跑步:逆风 (HW),尾风 (TW),没有风 (NW) 和没有风扇 (NF).
- 一个定制的基于风扇的系统模拟了可比于地面运行条件的空气动力学阻力.
- 测量和分析了地面反应力 (GRF) 和时空参数 (接触时间,步骤频率,步伐长度).
主要成果:
- 逆风 (HW) 显著增加推进冲动和减少制动冲动相比没有风扇 (NF) 在两种速度,在更快的速度更明显的影响.
- 尾风 (TW) 和无风 (NW) 条件也显示出与NF相比,推进和制动冲动的差异一致,尽管较小.
- 纵向GRF和时空参数在空气流条件之间没有显著差异,尽管它们随着运行速度的变化而变大.
结论:
- 训练有素的跑步者主要通过调节前后 (AP) GRF来适应空气阻力,特别是增加推进和减少制动,而不是改变垂直负载或步伐特征.
- 这些生物力学调整在更高的运行速度时更加明显.
- 这些发现强调了实验室跑步机研究中模拟现实的空气流条件的重要性,以准确反映地面跑步的生物力学.
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