Riazati Sherveen, Caplan Nick, Matabuena Marcos, Hayes Philip R
Department of Sport and Exercise Sciences, School of Life Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom.
CiTIUS (Centro Singular de Investigación en Tecnoloxías Intelixentes), University of Santiago of Compostela, Santiago de Compostela, Spain.
Front Bioeng Biotechnol. 2020 Apr 22;8:360. doi: 10.3389/fbioe.2020.00360. eCollection 2020.
To investigate changes in hip and knee strength, kinematics, and running variability following two energy expenditure matched training runs; a medium intensity continuous run (MICR) and a high intensity interval training session (HIIT).
Twenty (10 Females, 10 Males) healthy master class runners were recruited. Each participant completed the HIIT consisting of six repetitions of 800 m with a 1:1 work: rest ratio. The MICR duration was set to match energy expenditure of the HIIT session. Hip and knee muscular strength were examined pre and post both HIIT and MICR. Kinematics and running variability for hip and knee, along with spatiotemporal parameters were assessed at start and end of each run-type. Changes in variables were examined using both 2 × 2 ANOVAs with repeated measures and on an individual level when the change in a variable exceeded the minimum detectable change (MDC).
All strength measures exhibited significant reductions at the hip and knee ( < 0.05) with time for both run-types; 12% following HIIT, 10.6% post MICR. Hip frontal plane kinematics increased post run for both maximum angle ( < 0.001) and range of motion ( = 0.003). Runners exhibited increased running variability for nearly all variables, with the HIIT having a greater effect. Individual assessment revealed that not all runners were effected post run and that following HIIT more runners had reduced muscular strength, altered kinematics and increased running variability.
Runners exhibited fatigue induced changes following typical training runs, which could potentially present risk of injury development. Group and individual assessment revealed different findings where the use of MDC is recommended over that of -values.
研究两次能量消耗匹配的训练跑步后，髋部和膝部力量、运动学以及跑步变异性的变化；一次中等强度持续跑（MICR）和一次高强度间歇训练课（HIIT）。
招募了20名（10名女性，10名男性）健康的大师级跑步者。每位参与者完成了HIIT，包括6组800米重复跑，工作与休息比例为1:1。将MICR的持续时间设定为与HIIT课的能量消耗相匹配。在HIIT和MICR前后均检查髋部和膝部肌肉力量。在每种跑步类型的开始和结束时评估髋部和膝部的运动学、跑步变异性以及时空参数。使用重复测量的2×2方差分析以及当变量变化超过最小可检测变化（MDC）时在个体水平上检查变量的变化。
两种跑步类型的所有力量测量指标在髋部和膝部均随时间呈现显著降低（<0.05）；HIIT后降低12%，MICR后降低10.6%。两种跑步类型后，髋部额状面运动学在最大角度（<0.001）和运动范围（=0.003）方面均有所增加。跑步者几乎所有变量的跑步变异性均增加，HIIT的影响更大。个体评估显示，并非所有跑步者在跑步后都受到影响，并且在HIIT后，更多跑步者的肌肉力量下降、运动学改变且跑步变异性增加。
跑步者在典型训练跑步后表现出疲劳诱导的变化，这可能会带来受伤发展的风险。组内和个体评估显示出不同的结果，建议使用MDC而非P值。
