Effect of Jump Direction on Joint Kinetics of Take-Off Legs in Double-Leg Rebound Jumps
Abstract
1. Introduction
2. Materials and Methods
2.1. Participants
2.2. Experimental Procedures
2.3. Data Analysis
2.4. Statistics
3. Results
4. Discussion
5. Conclusions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
Appendix B
Contact Time | Vertical Velocity | Horizontal Velocity | Ecc Torque | Con Torque | Negative Power | Positive Power | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ankle | Knee | Hip | Ankle | Knee | Hip | Ankle | Knee | Hip | Ankle | Knee | Hip | ||||
VDJ vs. 50% | 0.799 | <0.001 | 0.160 | 0.720 | 0.267 | 0.543 | 0.962 | 0.631 | 0.723 | 0.008 | 0.057 | 0.007 | 0.406 | 0.029 | 0.001 |
VDJ vs. 75% | 0.748 | <0.001 | 0.037 | 0.568 | 0.946 | 0.100 | 0.940 | 0.373 | 0.677 | 0.009 | 0.0098 | 0.010 | 0.537 | 0.008 | <0.001 |
VDJ vs. 100% | 0.889 | <0.001 | <0.001 | 0.258 | 0.261 | 0.015 | 0.571 | 0.139 | 0.319 | 0.413 | 0.003 | 0.004 | 0.982 | 0.0099 | <0.001 |
50% vs. 75% | 1.000 | <0.001 | 0.471 | 0.749 | 0.554 | 0.045 | 0.900 | 0.698 | 0.150 | 0.686 | 0.241 | 0.478 | 0.863 | 0.534 | 0.148 |
50% vs. 100% | 0.709 | <0.001 | <0.001 | 0.610 | 0.266 | 0.075 | 0.623 | 0.207 | 0.136 | 0.682 | 0.567 | 0.191 | 0.666 | 0.264 | 0.009 |
75% vs. 100% | 0.709 | <0.001 | <0.001 | 0.610 | 0.266 | 0.075 | 0.623 | 0.207 | 0.136 | 0.682 | 0.567 | 0.191 | 0.666 | 0.264 | 0.009 |
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Performance Variables | VDJ | 50% HDJ | 75% HDJ | 100% HDJ | Differences | Effect Size Partial η2 |
---|---|---|---|---|---|---|
Jump distance (m) | – | 1.11 ± 0.09 | 1.66 ± 0.13 | 2.21 ± 0.18 | – | – |
Contact time (s) | 0.147 ± 0.019 | 0.148 ± 0.009 | 0.148 ± 0.014 | 0.147 ± 0.016 | n.s. | 0.008 |
Vertical velocity (m/s) | 3.15 ± 0.20 | 3.06 ± 0.19 | 3.02 ± 0.21 | 2.70 ± 0.21 | VDJ,50%,75% > 100% | 0.682 |
Horizontal velocity (m/s) | −0.03 ± 0.18 | 1.56 ± 0.23 | 2.18 ± 0.30 | 3.11 ± 0.30 | VDJ < 50% < 75% < 100% | 0.990 |
Joint Kinetics | VDJ | 50% HDJ | 75% HDJ | 100% HDJ | Differences | Effect Size Partial η2 |
---|---|---|---|---|---|---|
Hip | ||||||
Ecc torque (N·m/kg) | 3.91 ± 1.88 | 3.67 ± 1.43 | 4.81 ± 2.05 | 5.91 ± 2.62 | n.s. | 0.356 |
Con torque (N·m/kg) | 1.38 ± 1.09 | 1.49 ± 0.55 | 1.26 ± 0.49 | 1.10 ± 0.57 | n.s. | 0.093 |
Negative power (W/kg) | −4.40 ± 4.25 | −0.83 ± 2.10 | −0.33 ± 0.83 | 0 ± 0 | VDJ > 50%,75%,100% | 0.422 |
Positive power (W/kg) | 4.19 ± 2.73 | 9.37 ± 2.89 | 11.15 ± 3.91 | 18.51 ± 9.83 | VDJ < 50%,75% < 100% | 0.588 |
Knee | ||||||
Ecc torque (N·m/kg) | 4.23 ± 1.31 | 3.91 ± 1.14 | 4.20 ± 1.21 | 3.76 ± 1.11 | n.s. | 0.016 |
Con torque (N·m/kg) | 4.00 ± 1.27 | 3.90 ± 1.01 | 3.84 ± 0.96 | 3.53 ± 1.19 | n.s. | 0.126 |
Negative power (W/kg) | −14.48 ± 7.67 | −18.98 ± 7.13 | −21.57 ± 8.54 | −23.34 ± 12.13 | VDJ < 75%,100% | 0.307 |
Positive power (W/kg) | 23.18 ± 9.01 | 18.83 ± 5.49 | 18.10 ± 5.77 | 16.27 ± 6.22 | VDJ > 75%,100% | 0.311 |
Ankle | ||||||
Ecc torque (N·m/kg) | 4.57 ± 1.32 | 4.47 ± 0.92 | 4.39 ± 1.08 | 4.17 ± 1.28 | n.s. | 0.048 |
Con torque (N·m/kg) | 4.38 ± 1.22 | 4.39 ± 0.88 | 4.36 ± 0.95 | 4.18 ± 1.08 | n.s. | 0.019 |
Negative power (W/kg) | −41.06 ± 12.66 | −35.93 ± 10.92 | −35.04 ± 11.17 | −37.12 ± 20.11 | VDJ > 50%,75% | 0.088 |
Positive power (W/kg) | 34.21 ± 12.20 | 32.23 ± 9.11 | 32.68 ± 9.34 | 34.29 ± 12.50 | n.s. | 0.022 |
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Kariyama, Y. Effect of Jump Direction on Joint Kinetics of Take-Off Legs in Double-Leg Rebound Jumps. Sports 2019, 7, 183. https://doi.org/10.3390/sports7080183
Kariyama Y. Effect of Jump Direction on Joint Kinetics of Take-Off Legs in Double-Leg Rebound Jumps. Sports. 2019; 7(8):183. https://doi.org/10.3390/sports7080183
Chicago/Turabian StyleKariyama, Yasushi. 2019. "Effect of Jump Direction on Joint Kinetics of Take-Off Legs in Double-Leg Rebound Jumps" Sports 7, no. 8: 183. https://doi.org/10.3390/sports7080183
APA StyleKariyama, Y. (2019). Effect of Jump Direction on Joint Kinetics of Take-Off Legs in Double-Leg Rebound Jumps. Sports, 7(8), 183. https://doi.org/10.3390/sports7080183