Falch Hallvard Nygaard, Kristiansen Eirik Lindset, Haugen Markus Estifanos, van den Tillaar Roland
Department of Sport Sciences and Physical Education, Nord University, 7600 Levanger, Norway.
J Funct Morphol Kinesiol. 2021 Oct 14;6(4):83. doi: 10.3390/jfmk6040083.
The change of direction (COD) ability is a task-specific skill dependent on different factors such as the degree of the turn, which has led to differentiating CODs as more force- (>90°) or velocity-oriented (<90°). Considering force and velocity requirements is of importance when designing sport-specific training programs for enhancing COD performance. Thus, 25 female handball and soccer players participated in this study, which investigated the association between three different strength and plyometric exercises and force- and velocity-oriented COD performance. By utilizing the median split analysis, the participants were further divided into a fast ( = 8) and a slow ( = 8) COD group, to investigate differences in step kinematics between fast and slow performers. The correlational analysis revealed that the bilateral back squat and unilateral quarter squat were significantly associated with several force- and velocity-oriented COD performance ( = -0.46 to -0.64), while the association between plyometric and COD performance was limited ( 0.44). The fast COD group revealed higher levels of strength, jump height, peak velocities, higher step frequencies, shorter ground contact times, and greater acceleration and braking power ( > 1.29, < 0.03). It was concluded that the observed correlation between strength and COD performance might be due to stronger athletes being able to produce more workload in a shorter time, which was supported by the step kinematics.
变向（COD）能力是一项特定任务技能，取决于不同因素，如转弯角度，这导致将COD区分为更多以力量为主（>90°）或以速度为主（<90°）。在设计特定运动训练计划以提高COD表现时，考虑力量和速度要求很重要。因此，25名女子手球和足球运动员参与了本研究，该研究调查了三种不同的力量和增强式练习与以力量和速度为主的COD表现之间的关联。通过使用中位数分割分析，参与者进一步分为快速（n = 8）和慢速（n = 8）COD组，以研究快速和慢速表现者之间的步运动学差异。相关分析表明，双侧后深蹲和单侧四分之一深蹲与几种以力量和速度为主的COD表现显著相关（r = -0.46至-0.64），而增强式练习与COD表现之间的关联有限（r = 0.44）。快速COD组表现出更高的力量水平、跳跃高度、峰值速度、更高的步频、更短的地面接触时间以及更大的加速和制动功率（p > 1.29，p < 0.03）。研究得出结论，观察到的力量与COD表现之间的相关性可能是由于较强的运动员能够在更短的时间内产生更多的工作量，这得到了步运动学的支持。
