Faculty of Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy.
Int J Sports Med. 2013 Mar;34(3):244-7. doi: 10.1055/s-0032-1323724. Epub 2012 Sep 12.
The present study investigated the effects of step frequency manipulation during training on slopes (2%) on biomechanical parameters at Iso-Efficiency Speed (without increasing the metabolic demand). 24 male marathon runners were randomly allocated to one of 2 training groups for 3 weeks: step frequency manipulation group (SFM, n=12) and free step frequency group (SFF, n=12). Lower limb kinematic parameters were measured before and after the 3 weeks training. The SFM group increased step length 4.30% (p<0.001), flight time 29.48% (p<0.001) and decreased contact time 14% (p<0.01). These findings coincide with characteristics of better running performances. The SFF group did not elicit such results. The results from the study could help coaches to devise training methods which could improve an athlete's performance through increasing step length. The method provided may aid faster race times for athletes.
本研究探讨了训练中步频变化对坡度（2%）下等效能速度（不增加代谢需求）的生物力学参数的影响。24 名男性马拉松运动员被随机分配到 2 个训练组中的一个，进行 3 周的训练：步频变化组（SFM，n=12）和自由步频组（SFF，n=12）。在 3 周的训练前后测量了下肢运动学参数。SFM 组的步长增加了 4.30%（p<0.001），腾空时间增加了 29.48%（p<0.001），触地时间减少了 14%（p<0.01）。这些发现与更好的跑步表现特征相符。SFF 组没有产生这样的结果。研究结果可以帮助教练设计训练方法，通过增加步长来提高运动员的表现。所提供的方法可能有助于运动员更快的比赛时间。
