Cabarkapa Damjana V, Cabarkapa Dimitrije, Aleksic Jelena, Ranisavljev Igor, Fry Andrew C
Jayhawk Athletic Performance Laboratory-Wu Tsai Human Performance Alliance, Department of Health, Sport and Exercise Sciences, University of Kansas, Lawrence, KS, United States.
Faculty of Sport and Physical Education, University of Belgrade, Belgrade, Serbia.
Front Sports Act Living. 2024 Aug 12;6:1441022. doi: 10.3389/fspor.2024.1441022. eCollection 2024.
One of the reoccurring questions that arises during the countermovement vertical jump (CVJ) assessment is whether the learning effect has an impact on the accuracy of the results obtained. Thus, the purpose of the present investigation was to examine the impact of the short-term learning effect on the assessment of lower-body neuromuscular performance characteristics when performed on a portable one-dimensional force plate system. Sixteen recreationally active college-age males volunteered to participate in the present study. Each participant completed four sets of three non-consecutive CVJs with no arm swing throughout a single day. Besides strong verbal encouragement, participants were constantly instructed to focus on pushing the ground as explosively as possible. Fourteen force-time metrics were selected for CVJ performance analysis purposes: eccentric and concentric peak and mean force and power, eccentric and concentric duration, contraction time, jump height, reactive strength index-modified, and countermovement depth. Repeated measures multivariate analysis of variance was used to examine statistically significant differences across four testing time points (< 0.05). The results indicate an absence of any meaningful differences across four testing time points in force-time metrics of interest during both eccentric and concentric phases of the CVJ. Moreover, no differences were observed in CVJ outcome metrics such as countermovement depth, suggesting that the movement strategy tends to remain consistent. Overall, these findings reveal that CVJ test repeatability is not affected by the short-term learning effect and that data are stable at least within the scope of this study and within this population.
在反向纵跳（CVJ）评估过程中反复出现的问题之一是学习效应是否会对所获得结果的准确性产生影响。因此，本研究的目的是检验在便携式一维测力平台系统上进行测试时，短期学习效应对下肢神经肌肉性能特征评估的影响。16名有运动习惯的大学年龄男性自愿参与本研究。每位参与者在一天内完成四组，每组三次不连续的无摆臂反向纵跳。除了给予强烈的言语鼓励外，还不断指导参与者尽可能爆发性地蹬地。为分析CVJ表现，选取了14个力-时间指标：离心和向心阶段的峰值力、平均力和功率，离心和向心阶段的持续时间，收缩时间，跳跃高度，修正的反应力量指数，以及反向运动深度。采用重复测量多因素方差分析来检验四个测试时间点之间的统计学显著差异（<0.05）。结果表明，在CVJ的离心和向心阶段，所关注的力-时间指标在四个测试时间点之间没有任何有意义的差异。此外，在反向运动深度等CVJ结果指标上也未观察到差异，这表明运动策略倾向于保持一致。总体而言，这些发现表明，CVJ测试的可重复性不受短期学习效应的影响，并且至少在本研究范围内和该人群中数据是稳定的。
