Introduction of dynamic rate-of-force development scaling factor in progressive drop jumps

Nejc Šarabon (Avtor), Olivera M. Knezevic (Avtor), Dragan M. Mirkov (Avtor), Darjan Smajla (Avtor)

Povzetek

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.

Ključne besede

explosive strength;stretch-shortening cycle;plyometric;ankle;isometric;

Podatki

Jezik:	Angleški jezik
Leto izida:	2020
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UP FVZ - Fakulteta za vede o zdravju
UDK:	796.012.11
COBISS:	24332035
ISSN:	0021-9290
Št. ogledov:	1765
Št. prenosov:	70
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarne ključne besede:	eksplozivna moč;cikel raztezanja-krčenja;pliometrija;gleženj;izometrično;
Strani:	str. 1-7
Zvezek:	ǂVol. ǂ110
Čas izdaje:	Sep. 2020
DOI:	10.1016/j.jbiomech.2020.109980
ID:	15493623