Walsh Joel A, Stamenkovic Alexander, Dawber James P, Stapley Paul J
Neural Control of Movement Laboratory, School of Medical, Indigenous and Health Sciences, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, NSW, Australia.
Motor Control Laboratory, Department of Physical Therapy, Virginia Commonwealth University, Richmond, VA, United States.
Front Sports Act Living. 2023 Jan 10;4:1047369. doi: 10.3389/fspor.2022.1047369. eCollection 2022.
To characterize alterations of lower limb intersegmental coordination during the acute phase of running after cycling among highly trained triathletes using an analysis of planar covariation.
Nine highly trained triathletes completed a control run (CR) and a run after transitioning from cycling exercise (transition run, or TR condition) on a motorized treadmill at a self-selected pace. Sagittal plane kinematics were recorded using a 3D Vicon motion capture system. Intersegmental coordination of the thigh, shank and foot segments of the right lower limb and run loop planarity were calculated during running before cycling and at four different times after the end of cycling.
PCA showed a significant within-subject phase shift of the run loop planarity ( = 6.66, = 0.01). analysis showed significance median differences increase for parameter between CR vs. TR ( = 0.01), TR ( = 0.01) and TR ( = 0.01). No difference for parameter existed between CR vs. TR.
Prior variable-cadence, moderate intensity cycling has a significant effect on run loop planarity and therefore intersegmental coordination during the acute transition phase among highly trained triathletes. However, alterations to lower limb coordination are corrected by the 3rd minute after the beginning of the post cycle run. We suggest that planar covariation can be used as a more sensitive measure of cycling-induced variations in running to characterize adaptation in elite and importantly, developing athletes.
通过平面协变分析，描述高水平铁人三项运动员在骑行后跑步急性期下肢节段间协调性的变化。
9名高水平铁人三项运动员在电动跑步机上以自选速度完成一次对照跑步（CR）和一次从骑行运动过渡后的跑步（过渡跑，即TR条件）。使用3D Vicon运动捕捉系统记录矢状面运动学数据。在骑行前跑步期间以及骑行结束后的四个不同时间点，计算右下肢大腿、小腿和足部节段的节段间协调性以及跑步环平面性。
主成分分析显示跑步环平面性存在显著的受试者内相位偏移（=6.66，=0.01）。分析显示，CR与TR之间、TR（=0.01）和TR（=0.01）之间参数的中位数差异具有显著性。CR与TR之间参数无差异。
先前的可变节奏、中等强度骑行对高水平铁人三项运动员急性过渡阶段的跑步环平面性以及节段间协调性有显著影响。然而，在骑行后跑步开始后的第3分钟，下肢协调性的变化得到纠正。我们建议平面协变可作为一种更敏感的测量方法，用于表征骑行对跑步的影响，以描述精英运动员以及重要的是正在成长的运动员的适应性。
