School of Allied Health Sciences, Griffith University, Australia; Griffith Centre for Biomedical and Rehabilitation Engineering (GCORE), Menzies Health Institute Queensland, Griffith University, Australia.
School of Allied Health Sciences, Griffith University, Australia; Griffith Centre for Biomedical and Rehabilitation Engineering (GCORE), Menzies Health Institute Queensland, Griffith University, Australia.
J Sci Med Sport. 2021 Sep;24(9):939-944. doi: 10.1016/j.jsams.2021.03.008. Epub 2021 Mar 19.
To quantify the changes in work done by lower limb joint moments during maximal speed running following a sports-specific repeated running protocol.
Observational with repeated-measures.
Recreational athletes (n = 18 (9 females), aged = 26.2 ± 6.2 years) performed 12 maximal 30-m sprints on a non-motorised treadmill. Three-dimensional kinematics and ground reaction forces were subsequently recorded during a 10-m maximal overground sprint before and immediately after the repeated running protocol, from which we calculated work done by sagittal plane hip, knee, and ankle moments. Relative work (J/kg) was reported as a percentage of positive and negative work done by the sum of joint moments.
Following the repeated running protocol, maximal sprint speed decreased by 19% and was accompanied by reductions in total positive (-1.47 J/kg) and negative (-0.92 J/kg) work, in addition to work done by hip (-0.43 to -0.82 J/kg) and knee (-0.28 J/kg) moments during swing. Compared to before the repeated running protocol, less relative work was done by hip (-9%) and knee (-3%) extension moments during swing. Reductions in work done by hip and knee joint moments during swing were significantly correlated with reductions in maximum running speed (r = 0.61-0.89, p < 0.05).
A sports-specific repeated running protocol resulted in reductions in mechanical work done by sagittal plane hip and knee joint moments during maximal overground sprinting. Interventions focused on maintaining positive work done by the hip flexors/extensors and negative work done by knee flexors/extensors during the swing phase of running may help prevent reductions in speed following repeated sprinting.
量化特定于运动的重复跑步方案后，在最大速度跑步过程中下肢关节力矩所做的功的变化。
观察性重复测量。
研究对象为 18 名（9 名女性）休闲运动员，年龄为 26.2±6.2 岁，在非电动跑步机上进行了 12 次 30 米最大冲刺。在重复跑步方案之前和之后，立即在 10 米最大地面冲刺中记录了三维运动学和地面反作用力，我们从这些数据中计算了矢状面髋关节、膝关节和踝关节力矩所做的功。相对功（J/kg）以关节力矩总和的正功和负功的百分比报告。
在重复跑步方案之后，最大冲刺速度降低了 19%，并且总正功（-1.47 J/kg）和负功（-0.92 J/kg）以及摆动时髋关节（-0.43 至-0.82 J/kg）和膝关节（-0.28 J/kg）力矩的功都减少了。与重复跑步方案之前相比，摆动时髋关节和膝关节伸展力矩的相对功减少了（-9%和-3%）。摆动时髋关节和膝关节关节力矩所做的功减少与最大跑步速度的减少显著相关（r=0.61-0.89，p<0.05）。
特定于运动的重复跑步方案导致最大地面冲刺时矢状面髋关节和膝关节关节力矩所做的机械功减少。干预措施侧重于在跑步的摆动阶段保持髋关节屈肌/伸肌的正功和膝关节屈肌/伸肌的负功，可能有助于防止重复冲刺后速度下降。
