Padulo J
University e-Campus, Novedrate ITALY ; Tunisian Research Laboratory "Sports Performance Optimization" National Centre of Medicine and Science in Sport, Tunis, Tunisia.
Biol Sport. 2015 Sep;32(3):267-71. doi: 10.5604/20831862.1166922. Epub 2015 Aug 31.
Stride length analysis represents an easy method for assessing race walking kinematics. However, the stride parameters emerging from such an analysis have never been used to design a training protocol aimed at increasing stride length. With this aim, we investigated the effects of stride frequency manipulation during three weeks of uphill (2%) training on stride length at iso-efficiency speed. Twelve male race walkers were randomly allocated to one of two training groups: stride frequency manipulation (RWM, n=6) and free stride frequency (RWF, n=6).
Kinematic parameters measured before and after the 3-week training in RWM showed increased stride length (4.54%; p<0.0001) and contact time (4.58%; p<0.001); inversely, a decreased stride frequency (4.44%; p<0.0001) and internal work (7.09%; p<0.05) were found. In RWF the effect of the training showed a decrease in stride length (1.18%; p<0.0001) and contact time (<1%; p<0.0001) with respect to baseline conditions and an increased stride frequency and internal work of 1.19% (p<0.0001). These results suggest that using slopes (2%) as RWM could help coaches to provide some training methods that would improve an athlete's performance, through increasing stride length without altering his or her race walking technique or metabolic demands.
步幅分析是评估竞走运动学的一种简便方法。然而，这种分析得出的步幅参数从未被用于设计旨在增加步幅的训练方案。出于这一目的，我们研究了在三周的上坡（2%）训练期间，通过调整步频对等效率速度下的步幅所产生的影响。12名男性竞走运动员被随机分配到两个训练组之一：步频调整组（RWM，n = 6）和自由步频组（RWF，n = 6）。
在RWM组进行3周训练前后测量的运动学参数显示，步幅增加（4.54%；p < 0.0001），着地时间增加（4.58%；p < 0.001）；相反，步频降低（4.44%；p < 0.0001），内部功降低（7.09%；p < 0.05）。在RWF组，训练效果显示与基线条件相比，步幅减小（1.18%；p < 0.0001），着地时间减小（<1%；p < 0.0001），步频和内部功增加1.19%（p < 0.0001）。这些结果表明，将斜坡（2%）用作RWM可以帮助教练提供一些训练方法，通过增加步幅而不改变运动员的竞走技术或代谢需求来提高运动员的成绩。
