The force–velocity relationship obtained during the squat jump exercise is meaningfully influenced by the initial knee angle. Issue 9 (21st October 2022)

• Record Type: Journal Article
• Authors: Janicijevic, Danica; Knezevic, Olivera M.; Mirkov, Dragan M.; Pérez-Castilla, Alejandro; Petrovic, Milos; Samozino, Pierre; García-Ramos, Amador
• Is Part Of: Sports biomechanics. Volume 21:Issue 9(2022)
• Page Start: 1136
• Page End: 1145
• Publication Date: 2022-10-21
• Subjects: Maximum force -- maximum velocity -- maximum power -- vertical jump; Biomechanics -- Periodicals; Sports -- Physiological aspects -- Periodicals; Human mechanics -- Periodicals; 617.1027
• DOI: 10.1080/14763141.2020.1727559
• Languages: English
• ISSNs: 1476-3141

Abstract

ABSTRACT: This study aimed to compare the magnitude of the force-velocity (F-V) relationship parameters (maximum force [ F 0 ], maximum velocity [ V 0 ], F-V slope, and maximum power [Pmax ]) between the squat jumps (SJ) performed from different knee angles. The F-V relationships of 12 men were assessed in 3 sessions during the SJ performed from a knee angle of 80° (SJ80), 90° (SJ90) and 100° (SJ100). The SJ100 provided likely to very likely higher values of F 0 and Pmax compared to SJ80 (86% and 98%, respectively) and SJ90 (73% and 94%, respectively), while unclear and trivial differences were observed for the remaining comparisons. The magnitude of the correlations between the 3 SJ types was very large to nearly perfect for Pmax ( r range = 0.864 to 0.940), moderate to very large for F 0 ( r range = 0.438 to 0.778), and small to large for V 0 ( r range = 0.361 to 0.642) and the F-V slope ( r range = 0.178 to 0.645). These results suggest that the F-V relationship assessed during the SJ exercise is affected by the initial knee angle with the increase of the knee angle from 80° to 100° being associated with higher values of F 0 and Pmax, while V 0 remains unchanged.