Abstract：
Change-of-direction speed (CODS) directly impacts success in sports, police, and military performance. Movements requiring CODS are often preceded by aerobic or anaerobic running. Therefore, this study investigated the effects of maximal and submaximal anaerobic and aerobic running on subsequent CODS performance. A sample of 50 police students (42% female and 58% male) performed a maximal 300-yard shuttle run test (SR300y) and a 2.4-km Cooper test (CT2.4km) at maximal effort and also at 95, 90, 85, 80, and 75% of maximal effort. CODS was assessed using the Illinois Agility Test (IAT) immediately following each intensity level of each test at 12 separate testing sessions. To avoid fatigue, the period between each consecutive session was a minimum of 3 days. Paired samples t-tests were used to determine the differences between the two conditions (anaerobic lactic and aerobic) and for the IAT. A repeated measure analysis of variance with a Bonferroni post hoc test was used to analyze partial effects of different running intensities on the IAT. A significant reduction in speed was observed between the initial IATmax time and the IATmax time after performing the SR300y at intensities of 95, 90, 85, and 80% of maximal speed on this test. IAT performance was significantly slower when performed after the CT2.4km at 95 and 90% of maximal aerobic speed. The effects of the SR300y on the IAT were significantly greater than the effects of the CT2.4km. No significant differences were found by sex. Building up to 90% intensity, anaerobic running has a greater negative impact on subsequent CODS performance than does aerobic running.
摘要：
改变方向的速度（CODS）直接影响运动的成功，警察,和军事表现。需要CODS的运动通常在有氧或无氧运行之前进行。因此,这项研究调查了最大和次最大无氧和有氧运行对随后CODS表现的影响。50名警察学生（女性占42％，男性占58％）的样本以最大的努力以及95、90、85、80和75％的最大努力进行了最大的300码穿梭测试（SR300y）和2.4km的Cooper测试（CT2.4km）。在每个测试的每个强度水平之后,在12个单独的测试阶段立即使用伊利诺伊敏捷性测试(IAT)评估CODS。为了避免疲劳,每次连续疗程之间的时间至少为3天.使用配对样品t检验来确定两种条件(厌氧乳酸和需氧)与IAT之间的差异。使用Bonferroni事后检验对方差进行重复测量分析，以分析不同运行强度对IAT的部分影响。在此测试中,在最大速度的95、90、85和80%的强度下执行SR300y之后,在初始IATmax时间与IATmax时间之间观察到速度的显著降低。在95％和90％的最大有氧速度下进行CT2.4km后，IAT性能明显较慢。SR300y对IAT的影响明显大于CT2.4km的影响。性别没有发现显着差异。强度高达90%，无氧运行比有氧运行对后续CODS表现有更大的负面影响。
