■技术的进步最近使在不同环境条件下实施有效的培训解决方案成为可能。这项研究评估了从创新的机动设备获得的措施的可靠性和有效性,Alex7(Inosportas,立陶宛),以及年轻足球运动员的抵抗和辅助短跑之间的速度和运动学特征差异。
■二十七名男运动员(平均年龄:16.5±0.8岁;身高:179.5±6.9厘米;体重:67.7±8.3千克)在三种不同的条件下进行了两次30米冲刺:常规,反抗,并辅助短跑。Alex7设备在冲刺期间提供了帮助和阻力。将结果与Witty定时门的结果进行了比较。地面接触时间,飞行时间,步幅长度,和速度是使用OptoJump系统测量的。使用单一测量的双向混合组内相关系数(ICC)评估可靠性,平均值的标准误差(SEM),和变异系数(CV)。Pearson的相关系数确定了Alex7和Witty计时系统之间的关联。标准参考有效性基于平均差异和CV。使用Bland-Altman分析通过协议限制确定系统偏差。
■使用Alex7设备获得的运行时间在会话之间表现出良好到出色的重测可靠性(ICC,0.83-0.94)以及在辅助和抵抗运行条件下Alex7和Witty系统之间的良好到极好的相关性(Pearson\'sr=0.88-0.98)。然而,Alex7设备始终比Witty设备产生更长的运行时间(差异高达0.16s,p<0.001)。不同的运行条件产生了运动学变量的实质性变化,如步幅长度,接地时间,和运行速度(所有p<0.001),但是对飞行时间和运行速度的影响较小。
■Alex7设备显示出高可靠性,可以为年轻的足球运动员创造抵抗和辅助的跑步条件。然而,它往往会高估运行时间,在评估时间参数时需要谨慎。
UNASSIGNED: Advancements in technology have recently made it possible to implement effective training solutions across different environmental conditions. This study evaluated the reliability and validity of measures obtained from the innovative motorized device, Alex7 (Inosportas, Lithuania), and differences in speed and kinematic characteristics between resisted and assisted sprinting in young
football players.
UNASSIGNED: Twenty-seven male athletes (mean age: 16.5 ± 0.8 years; height: 179.5 ± 6.9 cm; body weight: 67.7 ± 8.3 kg) each performed 30-m sprints twice under three different conditions: regular, resisted, and assisted sprinting. The Alex7 device provided the assistance and resistance during sprints. Results were compared with those from Witty timing gates. Ground contact time, flight time, stride length, and pace were measured using the OptoJump system. Reliability was assessed using two-way mixed intraclass correlation coefficients (ICCs) for single measures, the standard error of the mean (SEM), and the coefficient of variation (CV). Pearson\'s correlation coefficient determined the associations between Alex7 and Witty timing systems. Criterion-referenced validity was based on the mean difference and CV. Systematic bias was determined by limits of agreement using Bland-Altman analysis.
UNASSIGNED: Running times obtained using the Alex7 equipment exhibited good to excellent test-retest reliability between sessions (ICC, 0.83-0.94) and good to excellent correlation (Pearson\'s r = 0.88-0.98) between the Alex7 and Witty systems in both assisted and resisted running conditions. However, the Alex7 device consistently produced longer running times than the Witty device (up to 0.16 s difference, p < 0.001). The different running conditions produced substantial variations in kinematic variables, such as stride length, ground contact time, and running speed (p < 0.001 for all), but the effects on flight time and running pace were smaller.
UNASSIGNED: The Alex7 device shows high reliability for creating resisted and assisted running conditions for young
football players. However, it tends to overestimate running time, necessitating caution when assessing the time parameters.