The University of Queensland, Division of Physiotherapy, Brisbane, Australia.
Sports Biomech. 2011 Mar;10(1):59-71. doi: 10.1080/14763141.2010.547593.
Running is the most important discipline for Olympic triathlon success. However, cycling impairs running muscle recruitment and performance in some highly trained triathletes; though it is not known if this occurs in elite international triathletes. The purpose of this study was to investigate the effect of cycling in two different protocols on running economy and neuromuscular control in elite international triathletes. Muscle recruitment and sagittal plane joint angles of the left lower extremity and running economy were compared between control (no preceding cycle) and transition (preceded by cycling) runs for two different cycle protocols (20-minute low-intensity and 50-minute high-intensity cycles) in seven elite international triathletes. Muscle recruitment and joint angles were not different between control and transition runs for either cycle protocols. Running economy was also not different between control and transition runs for the low-intensity (62.4 +/- 4.5 vs. 62.1 +/- 4.0 ml/min/kg, p > 0.05) and high-intensity (63.4 +/- 3.5 vs. 63.3 +/- 4.3 ml/min/kg, p > 0.05) cycle protocols. The results of this study demonstrate that both low- and high-intensity cycles do not adversely influence neuromuscular control and running economy in elite international triathletes.
跑步是奥林匹克三项全能成功的最重要的学科。然而，在一些训练有素的铁人三项运动员中，自行车会损害跑步的肌肉募集和表现；尽管尚不清楚这种情况是否发生在精英国际铁人三项运动员中。本研究的目的是调查两种不同方案的自行车运动对精英国际铁人三项运动员跑步经济性和神经肌肉控制的影响。在七名精英国际铁人三项运动员中，比较了两种不同的自行车方案（20 分钟低强度和 50 分钟高强度循环）的控制（无前置循环）和过渡（前置循环）跑步时左下肢的肌肉募集和矢状面关节角度以及跑步经济性。对于两种自行车方案，控制和过渡跑步时肌肉募集和关节角度均无差异。对于低强度（62.4 +/- 4.5 与 62.1 +/- 4.0 ml/min/kg，p > 0.05）和高强度（63.4 +/- 3.5 与 63.3 +/- 4.3 ml/min/kg，p > 0.05）自行车方案，控制和过渡跑步时的跑步经济性也无差异。本研究的结果表明，低强度和高强度自行车运动都不会对精英国际铁人三项运动员的神经肌肉控制和跑步经济性产生不利影响。
