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This study aimed to compare the magnitude of the force-velocity (F-V) relationship parameters (maximum force [ F0 ], maximum velocity [ V0 ], F-V slope, and maximum power [P max ]) 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  F0  and P max  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 P max  ( r  range = 0.864 to 0.940), moderate to very large for  F0  ( r  range = 0.438 to 0.778), and small to large for  V0  ( 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  F0  and P max , while  V0  remains unchanged.

The force–velocity relationship obtained during the squat jump exercise is meaningfully influenced by the initial knee angle