当前位置: X-MOL 学术J. Biomech. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Introduction of dynamic rate-of-force development scaling factor in progressive drop jumps.
Journal of Biomechanics ( IF 2.4 ) Pub Date : 2020-07-31 , DOI: 10.1016/j.jbiomech.2020.109980
Nejc Šarabon 1 , M Olivera Knezevic 2 , M Dragan Mirkov 3 , Darjan Smajla 4
Affiliation  

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-SFDJ). 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-SFPF), eccentric part of DJ (RFD-SFDJ-ECC) and concentric part of DJ (RFD-SFDJ-CON), as well as average jump height (DJH) 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-SFPF and RFD-SFDJ-ECC (r = 0.311, p < 0.05) and small negative correlations between RFD-SFDJ-CON and RFD-SF (r = -0.276, p < 0.05). Significant positive moderate correlations were seen only between RFD-SFDJ-ECC and DJH 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-SFDJ can be obtained from the multi-joint tasks (60 jumps) and still provide acceptable reliability and linear relationship. Furthermore, RFD-SFDJ may have greater practical application than RFD-SF assessed under the isometric conditions. This verification of RFD-SFDJ opens opportunities for further research regarding its practical application.



中文翻译:

在渐进式跌落跳跃中引入动态力发展比例因子。

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。

更新日期:2020-08-06
down
wechat
bug