Eriksrud Ola, Westheim Frederic
Biomechanics Laboratory, Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway.
Front Sports Act Living. 2025 Jun 2;7:1592707. doi: 10.3389/fspor.2025.1592707. eCollection 2025.
The aim of this study was to determine reliability of assisted sprint outcome measurements using a motorized resistance device (MRD). A total of 21 participants (16 males and 5 females; age 22.3 ± 3.9 years, body mass 75.2 ± 6.9 kg, height 177.9 ± 6.8 cm) completed two assisted sprint tests on four different test sessions while exposed to an external load (3 kg) provided by the MRD. Outcome variables included time, top speed, maximum acceleration and 5 m split times and speeds. Intrasession and test-retest reliability was assessed using intraclass correlation coefficient (ICC), coefficient of variation (CV), typical error (TE), smallest worthwhile (SWC) and moderate worthwhile change (MDC). For test-retest reliability mostly high to extremely high ICC values (>0.77), and good (<5%) CV values were observed for all outcome measurements. Specifically, all outcome measurements showed high to extremely high relative reliability (ICC ≥ 0.95) except 0-5 m time (0.86) and maximum acceleration (0.77). Good absolute reliability was observed for all outcome measurements (CV range: 0.9-3.7) except maximum acceleration (8.7). Furthermore, most outcome variables were rated as good and ok for SWC. Similar findings were observed for intrasession reliability with very high ICC values for all outcome measurements except maximum acceleration (0.85-0.93) and 0-5 time for session 2-4 (0.88-0.92). Similarly, CV was good for all outcome measurements for all sessions except maximum acceleration (5.7-5.9%). In addition, all outcome measurements had good to ok SWC, except for maximum acceleration. In conclusion, the present study shows that the MRD can obtain reliable assisted sprint outcome measurements and thereby provide coaches and researchers with new opportunities to advance, monitor and evaluate sprint training.
本研究的目的是确定使用电动阻力装置（MRD）进行辅助冲刺结果测量的可靠性。共有21名参与者（16名男性和5名女性；年龄22.3±3.9岁，体重75.2±6.9 kg，身高177.9±6.8 cm）在四个不同的测试阶段完成了两次辅助冲刺测试，同时承受由MRD提供的外部负荷（3 kg）。结果变量包括时间、最高速度、最大加速度以及5米分段时间和速度。使用组内相关系数（ICC）、变异系数（CV）、典型误差（TE）、最小有价值变化（SWC）和中度有价值变化（MDC）评估测试阶段内和重测的可靠性。对于重测可靠性，大多数结果测量观察到高至极高的ICC值（>0.77）和良好（<5%）的CV值。具体而言，除了0至5米时间（0.86）和最大加速度（0.77）外，所有结果测量均显示出高至极高的相对可靠性（ICC≥0.95）。除最大加速度（8.7）外，所有结果测量均观察到良好 的绝对可靠性（CV范围：0.9 - 3.7）。此外，大多数结果变量的SWC被评为良好和尚可。对于测试阶段内可靠性，除最大加速度（0.85 - 0.93）以及第2至4阶段的0至5米时间（0.88 - 0.92）外，所有结果测量的ICC值都非常高，观察到了类似的结果。同样，除最大加速度（5.7 - 5.9%）外所有阶段的所有结果测量的CV都良好。此外，除最大加速度外，所有结果测量的SWC都良好或尚可。总之，本研究表明，MRD可以获得可靠的辅助冲刺结果测量，从而为教练和研究人员提供推进、监测和评估冲刺训练的新机会。
