Department of Physical Education, Hong Kong Baptist University , Hong Kong, China ;
School of Physical Education and Sports, Macao Polytechnic Institute , Macao, China ;
J Sports Sci Med. 2014 May 1;13(2):244-51. eCollection 2014 May.
This study investigated the occurrence of core muscle fatigue during high-intensity running exercise and its limitation to exercise performance. A secondary aim was to investigate whether respiratory muscle work performed during intense running periods, would contribute to core muscle fatigue. Nine male recreational runners were recruited for two reasons; (1) to perform a continuous treadmill run at 85% VO2max with and without core muscle fatigue in the CR_F and CR trials, respectively; and (2) to mimic the treadmill run-induced respiratory response recorded in the CR trial while subjects were free of whole-body exercise (Mimic trial). The changes in global core muscle function with fatigue in this study were evaluated by performing a sport-specific endurance plank test (SEPT), and the associated influence on running performance was examined by comparing the time to exhaustion during the treadmill run between the CR and CR_F trials. Subsequent to the treadmill run in the CR trial, SEPT (255.7 ± 85.3 vs 177.3 ± 80.6 s) was reduced from baseline in all runners. The reduction correlated (r = 0.67) with the concomitant decline in inspiratory muscle function revealed by maximal inspiratory mouth pressure (PImax: 151.3 ± 18.2 vs 133.3 ± 17.2 cmH2O, p < 0.05). In the Mimic trial, similar results in SEPT (212.3 ± 90.2 s), PImax (129.0 ± 26.7 cmH2O), and correlation (r = 0.77, p < 0.05) were observed following voluntary hyperpneic activity. With the preceded fatigued core muscle workout in the CR_F trial, the running capacity was impaired significantly (10.7 ± 4.5 vs 6.5 ± 2.0 min, p < 0.05). The impairment was correlated (r=0.72) to the SEPT reduction resulting from the workout. The results suggest that a high-intensity maximum run may induce core muscle fatigue in runners. The core muscle fatigue, which may be partly attributed to the corresponding respiratory work, may limit their running endurance. Inspiratory muscle function appears to be essential for core stabilization during the intense running. Key pointsA high-intensity maximum run may induce core muscle fatigue in runners. The core muscle fatigue, which may be partly attributed to the corresponding respiratory work, may limit their running endurance.In support of previous notion, inspiratory muscles may share the work of core stabilization during intense exercise, while simultaneously increasing the demand for breathing.Inspiratory muscle training incorporated into a running specific-core training regime potentially enhances the training effect on the core muscles in a functional manner to deal with the challenges faced during intense exercise.
本研究旨在探讨高强度跑步运动中核心肌肉疲劳的发生及其对运动表现的限制。次要目的是探讨在剧烈跑步期间进行的呼吸肌工作是否会导致核心肌肉疲劳。招募了 9 名男性娱乐跑步者有两个原因；(1) 在 CR_F 和 CR 试验中分别以 85% VO2max 的连续跑步机跑步，且无核心肌肉疲劳；(2) 在 CR 试验中模拟跑步机跑步引起的呼吸反应，同时受试者无全身运动（模拟试验）。通过进行特定于运动的耐力平板测试（SEPT）评估研究中核心肌肉整体功能随疲劳的变化，通过比较 CR 和 CR_F 试验中跑步机跑步的疲劳时间来检查其对跑步表现的影响。在 CR 试验中的跑步机跑步后，所有跑步者的 SEPT（255.7 ± 85.3 秒比基线减少 177.3 ± 80.6 秒）。减少与吸气肌肉功能的协同下降相关（最大吸气口压：151.3 ± 18.2 比 133.3 ± 17.2 cmH2O，p <0.05）。在模拟试验中，SEPT（212.3 ± 90.2 秒）、PImax（129.0 ± 26.7 cmH2O）和相关性（r = 0.77，p <0.05）在自愿性过度通气活动后也观察到类似的结果。在 CR_F 试验中，由于先前的疲劳核心肌肉锻炼，跑步能力显著受损（10.7 ± 4.5 比 6.5 ± 2.0 分钟，p <0.05）。这种损伤与锻炼导致的 SEPT 减少相关（r=0.72）。结果表明，高强度最大跑步可能会导致跑步者的核心肌肉疲劳。核心肌肉疲劳可能部分归因于相应的呼吸工作，可能会限制他们的跑步耐力。吸气肌功能似乎对于剧烈跑步时的核心稳定性至关重要。关键点高强度最大跑步可能会导致跑步者的核心肌肉疲劳。核心肌肉疲劳可能部分归因于相应的呼吸工作，可能会限制他们的跑步耐力。支持之前的观点，吸气肌在剧烈运动期间可能分担核心稳定性的工作，同时增加呼吸的需求。将吸气肌训练纳入特定于跑步的核心训练方案中，可以以功能方式增强核心肌肉的训练效果，以应对剧烈运动中面临的挑战。
