Dewolf Arthur H, Ivaniski-Mello André, Peyré-Tartaruga Leonardo Alexandre, Mesquita Raphael M
Laboratory of Biomechanics and Physiology of Locomotion, Institute of NeuroScience, Université Catholique de Louvain, Louvain-la-Neuve, Belgium.
LaBiodin Biodynamics Laboratory, School of Physical Education, Physiotherapy and Dance, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
R Soc Open Sci. 2024 Jun 12;11(6):231736. doi: 10.1098/rsos.231736. eCollection 2024 Jun.
This study aims to investigate the relationship between soft tissue energy dissipation and leg stiffness during running. Eight recreational healthy male runners (age: 22.2 ± 1.0 years; height: 1.84 ± 0.03 m; mass: 73.7 ± 5.7 kg) were asked to run at different speeds and step frequencies. Their soft tissue energy dissipation was estimated by the difference between the total mechanical work of the body, measured as the work done to move the body centre of mass relative to the surroundings plus the work to move the limbs relative to the body centre of mass, and lower-limb joint work. A mass-spring model with an actuator was used to analyse the force-length curve of the bouncing mechanism of running. In this way, the stiffness and damping coefficient were assessed at each speed and step frequency. Pearson's correlations were used to describe the relationship between the deviation from the spring-mass model and soft tissue energy fluctuations. The soft tissue dissipation was found to be significantly influenced by step frequency, with both positive and negative work phases decreasing when step frequency increases. Moreover, deviation from a spring-mass model was positively associated with the amount of soft tissue dissipation ( > 0.6). The findings emphasize the substantial role of soft tissues in dissipating or returning energy during running, behaving in a damped-elastic manner. Also, we introduce a novel approach for evaluating the elastic rebound of the body during running. The insights gained may have broad implications for assessing running mechanics, with potential applications in various contexts.
本研究旨在探讨跑步过程中软组织能量耗散与腿部刚度之间的关系。八名健康的男性业余跑步者（年龄：22.2±1.0岁；身高：1.84±0.03米；体重：73.7±5.7千克）被要求以不同速度和步频跑步。通过身体总机械功（以相对于周围环境移动身体质心所做的功加上相对于身体质心移动肢体所做的功来衡量）与下肢关节功之间的差异来估算他们的软组织能量耗散。使用带有执行器的质量-弹簧模型来分析跑步弹跳机制的力-长度曲线。通过这种方式，在每个速度和步频下评估刚度和阻尼系数。使用皮尔逊相关性来描述与弹簧-质量模型的偏差与软组织能量波动之间的关系。发现软组织耗散受步频的显著影响，当步频增加时，正负功阶段均减少。此外，与弹簧-质量模型的偏差与软组织耗散量呈正相关（>0.6）。研究结果强调了软组织在跑步过程中耗散或恢复能量方面的重要作用，其表现为阻尼弹性方式。此外，我们引入了一种评估跑步过程中身体弹性反弹的新方法。所获得的见解可能对评估跑步力学有广泛影响，在各种背景下都有潜在应用。
