Post-Graduate Program in Movement Sciences, Department of Physical Education, School of Sciences, Sao Paulo State University (UNESP), Bauru, SP, Brazil.
Universidad Autónoma del Estado de México, Toluca, Mexico.
Physiol Rep. 2023 Mar;11(5):e15564. doi: 10.14814/phy2.15564.
This study verified whether mechanical variables influence the anaerobic capacity outcome on treadmill running and whether these likely influences were dependent of running experience. Seventeen physical active and 18 amateur runners, males, performed a graded exercise test and constant load exhaustive running efforts at 115% of intensity associated to maximal oxygen consumption. During the constant load were determined the metabolic responses (i.e., gas exchange and blood lactate) to estimate the energetic contribution and anaerobic capacity as well as kinematic responses. The runners showed higher anaerobic capacity (16.6%; p = 0.005), but lesser time to exercise failure (-18.8%; p = 0.03) than active subjects. In addition, the stride length (21.4%; p = 0.00001), contact phase duration (-11.3%; p = 0.005), and vertical work (-29.9%; p = 0.015). For actives, the anaerobic capacity did not correlate significantly with any physiologic, kinematic, and mechanical variables and no regression model was fitted using the stepwise multiple regression, while to runners the anaerobic capacity was significantly correlated with phosphagen energetic contribution (r = 0.47; p = 0.047), external power (r = -0.51; p = 0.031), total work (r = -0.54; p = 0.020), external work (r = -0.62; p = 0.006), vertical work (r = -0.63; p = 0.008), and horizontal work (r = -0.61; p = 0.008), and the vertical work and phosphagen energetic contribution presented a coefficient of determination of 62% (p = 0.001). Based on findings, it is possible to assume that for active subjects, the mechanical variables have no influence over the anaerobic capacity, however, for experienced runners, the vertical work and phosphagen energetic contribution have relevant effect over anaerobic capacity output.
本研究旨在验证机械变量是否会影响在跑步机上跑步的无氧能力结果，以及这些可能的影响是否取决于跑步经验。17 名身体素质活跃的男性和 18 名业余男性跑步者进行了分级运动测试和以最大摄氧量的 115%强度进行的恒定负荷衰竭跑测试。在恒定负荷下，测定了代谢反应（即气体交换和血乳酸），以估计能量贡献和无氧能力以及运动学反应。跑步者的无氧能力较高（16.6%；p=0.005），但运动失败时间较短（-18.8%；p=0.03）。此外，步幅（21.4%；p=0.00001）、接触阶段持续时间（-11.3%；p=0.005）和垂直工作（-29.9%；p=0.015）。对于活跃的人来说，无氧能力与任何生理、运动学和机械变量都没有显著相关，也没有使用逐步多元回归拟合回归模型，而对于跑步者来说，无氧能力与磷酸原能量贡献（r=0.47；p=0.047）、外部功率（r=-0.51；p=0.031）、总功（r=-0.54；p=0.020）、外部功（r=-0.62；p=0.006）、垂直功（r=-0.63；p=0.008）和水平功（r=-0.61；p=0.008）显著相关，垂直功和磷酸原能量贡献的决定系数为 62%（p=0.001）。基于这些发现，可以假设对于活跃的受试者，机械变量对无氧能力没有影响，但是对于有经验的跑步者，垂直工作和磷酸原能量贡献对无氧能力输出有重要影响。
