| Title: | Introduction of dynamic rate-of-force development scaling factor in progressive drop jumps |
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| Authors: | ID Šarabon, Nejc (Author)
ID Knezevic, Olivera M. (Author)
ID Mirkov, Dragan (Author)
ID Smajla, Darjan (Author) |
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| Files: |  https://www.sciencedirect.com/science/article/abs/pii/S0021929020304036?via%3Dihub
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | IAM - Andrej Marušič Institute
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| Abstract: | 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. |
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| Keywords: | explosive strength, stretch-shortening cycle, plyometric, ankle, isometric |
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| Year of publishing: | 2020 |
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| Number of pages: | str. 1-6 |
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| PID: | 20.500.12556/RUP-13942  |
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| UDC: | 796.012.11 |
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| ISSN on article: | 0021-9290 |
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| DOI: | 10.1016/j.jbiomech.2020.109980 |
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| COBISS.SI-ID: | 24332035 |
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| Publication date in RUP: | 07.08.2020 |
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| Views: | 2786 |
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| Downloads: | 72 |
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