Rapid force generation across submaximal levels has been evaluated with the rate of force development scaling factor (RFD-SF) in different isometric tasks, while such measurement was still not verified in dynamic tasks. Our study was designed to evaluate the feasibility of the RFD-SF in dynamic drop jump (DJ) task (RFD-SF_DJ). A total of 55 young athletes performed isometric plantarflexion at different submaximal intensities and 60 DJs (6 different drop heights). For each participant we calculated linearity (r²) and slope in isometric task (RFD-SF_PF), eccentric part of DJ (RFD-SF_DJ-ECC) and concentric part of DJ (RFD-SF_DJ-CON), as well as average jump height (DJ_H) from each drop height. Our results revealed strong linear force-RFD relationship for isometric plantarflexion (r² = 0.90 ± 0.06), eccentric (r² = 0.87 ± 0.09) and concentric phase of DJ (r² = 0.80 ± 0.18). Significant moderate positive correlations were calculated between RFD-SF_PF and RFD-SF_DJ-ECC (r = 0.311, p < 0.05) and small negative correlations between RFD-SF_DJ-CON and RFD-SF (r = -0.276, p < 0.05)_. Significant positive moderate correlations were seen only between RFD-SF_DJ-ECC and DJ_H from 10 cm (r = 0.459, p < 0.001) and 15 cm (r = 0.423, p < 0.01). This is the first study to introduce and confirm that RFD-SF_DJ can be obtained from the multi-joint tasks (60 jumps) and still provide acceptable reliability and linear relationship. Furthermore, RFD-SF_DJ may have greater practical application than RFD-SF assessed under the isometric conditions. This verification of RFD-SF_DJ opens opportunities for further research regarding its practical application.

已通过不同等距任务中的力发展比例因子（RFD-SF）评估了跨次最大水平的快速力生成，而在动态任务中仍未验证这种测量。我们的研究旨在评估RFD-SF在动态跌落跳跃（DJ）任务（RFD-SF _DJ）中的可行性。共有55名年轻运动员在不同的次最大强度和60 DJ（6种不同的跌落高度）下进行了等距plant屈。对于每个参与者，我们还计算了等距任务的线性（r ²）和斜率（RFD-SF _PF），DJ的偏心部分（RFD-SF _DJ-ECC）和_DJ的同心部分（RFD-SF _DJ-CON）平均跳高（DJ _H）从每个下落高度开始。我们的结果表明，等距足底屈曲（r ²  = 0.90±0.06），偏心（r ²  = 0.87±0.09）和DJ同心相（r ²  = 0.80±0.18）具有很强的线性力与RFD关系。计算出RFD-SF _PF和RFD-SF _DJ-ECC之间存在显着的正相关（r = 0.311，p <0.05），RFD-SF _DJ-CON和RFD-SF之间存在较小的负相关（r = -0.276，p < 0.05）_。仅在RFD-SF _DJ-ECC和DJ _H之间看到显着的正中相关性从10厘米（r = 0.459，p <0.001）和15厘米（r = 0.423，p <0.01）。这是首次介绍并确认RFD-SF _DJ可以从多关节任务（60个跳跃）中获得，并且仍然提供可接受的可靠性和线性关系的研究。此外，RFD-SF _DJ可能比在等轴测条件下评估的RFD-SF具有更大的实际应用。RFD-SF _DJ的这一验证为有关其实际应用的进一步研究提供了机会。