Table 2.
Center of mass (COM), hip, knee and ankle negative (Neg), positive (Pos) and ratio of negative to positive work in higher strength (HS), moderate strength (MS) and lower strength (LS) subjects during the countermovement jump (CMJ) and drop jumps from 15 cm (DJ15), 30 cm (DJ30), 45 cm (DJ45), 60 cm (DJ60) and 75 cm (DJ75).
| Variable | COM | Hip | Knee | Ankle | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Neg work (J/kg) | Pos work (J/kg) | Neg/Pos work (%) | Neg work (J/kg) | Pos work (J/kg) | Neg/Pos work (%) | Neg work (J/kg) | Pos work (J/kg) | Neg/Pos work (%) | Neg work (J/kg) | Pos work (J/kg) | Neg/Pos work (%) | |
| CMJ | ||||||||||||
| HS | − 3.5 ± 2.7 | 6.8 ± 0.6 | 53 ± 43 | − 1.3 ± 0.3 | 2.4 ± 1.1 | 45 ± 14 | − 0.5 ± 0.3 | 1.9 ± 0.6 | 27 ± 13 | − 0.1 ± 0.1 | 1.6 ± 0.2 | 8 ± 3 |
| MS | − 2.2 ± 1.1 | 5.8 ± 1.2 | 40 ± 23 | − 1.2 ± 0.9 | 1.6 ± 1.1 | 56 ± 52 | − 0.8 ± 0.6 | 1.7 ± 0.6 | 41 ± 24 | − 0.2 ± 0.1 | 1.7 ± 0.8 | 10 ± 6 |
| LS | − 1.8 ± 1.3 | 5.1 ± 1.7* | 29 ± 21 | − 1.0 ± 0.6 | 1.3 ± 0.7 | 69 ± 38 | − 0.8 ± 0.5 | 1.8 ± 0.8 | 35 ± 18 | − 0.1 ± 0.1 | 1.2 ± 0.7 | 8 ± 5 |
| DJ15 | ||||||||||||
| HS | − 4.8 ± 0.6 | 7.1 ± 0.8 | 67 ± 6 | − 1.8 ± 0.4 | 2.6 ± 0.8 | 68 ± 14 | − 1.2 ± 0.6 | 2.0 ± 0.7 | 60 ± 30 | − 1.0 ± 0.4 | 2.2 ± 0.4 | 46 ± 17 |
| MS | − 4.5 ± 0.8 | 6.2 ± 0.9 | 72 ± 5 | − 1.3 ± 0.6 | 1.9 ± 1.1 | 74 ± 18 | − 1.5 ± 0.6 | 2.4 ± 1.0 | 66 ± 13 | − 1.3 ± 0.5 | 2.6 ± 0.6 | 47 ± 8 |
| LS | − 4.0 ± 0.8 | 5.1 ± 1.1* | 80 ± 10* | − 1.3 ± 0.4 | 1.7 ± 0.9 | 68 ± 18 | − 1.4 ± 0.5 | 1.8 ± 0.6 | 76 ± 10 | − 1.0 ± 0.4 | 2.0 ± 1.0 | 49 ± 13 |
| DJ30 | ||||||||||||
| HS | − 6.2 ± 0.7 | 7.1 ± 0.6 | 88 ± 8 | − 1.8 ± 0.4 | 2.4 ± 0.8 | 80 ± 13 | − 2.0 ± 0.7 | 2.2 ± 0.8 | 88 ± 14 | − 1.3 ± 0.5 | 1.9 ± 0.7 | 67 ± 28 |
| MS | − 6.4 ± 1.0 | 6.5 ± 0.8 | 97 ± 6 | − 1.7 ± 1.0 | 1.9 ± 1.0 | 91 ± 13 | − 2.3 ± 0.7 | 2.7 ± 0.8 | 85 ± 17 | − 1.8 ± 0.6 | 2.5 ± 0.6 | 71 ± 12 |
| LS | − 5.5 ± 0.9 | 5.6 ± 1.2* | 101 ± 11* | − 1.3 ± 0.7 | 1.7 ± 0.8 | 80 ± 12 | − 2.2 ± 1.6 | 2.3 ± 0.8 | 92 ± 31 | − 1.4 ± 0.6 | 2.0 ± 0.9 | 71 ± 16 |
| DJ45 | ||||||||||||
| HS | − 7.5 ± 0.6 | 6.9 ± 0.7 | 108 ± 11 | − 2.2 ± 1.0 | 2.1 ± 0.8 | 103 ± 37 | − 2.3 ± 0.9 | 2.3 ± 0.9 | 100 ± 16 | − 1.6 ± 0.7 | 1.8 ± 0.8 | 99 ± 49 |
| MS | − 7.6 ± 1.3 | 6.7 ± 1.3 | 114 ± 6 | − 1.9 ± 1.0 | 2.0 ± 1.1 | 103 ± 20 | − 2.9 ± 1.2 | 3.0 ± 1.6 | 99 ± 11 | − 1.8 ± 0.9 | 2.1 ± 0.7 | 83 ± 21 |
| LS | − 6.5 ± 0.9* | 5.5 ± 1.1* | 120 ± 11 | − 1.6 ± 0.7 | 1.8 ± 0.7 | 94 ± 17 | − 2.3 ± 0.8 | 2.3 ± 1.0 | 94 ± 16 | − 1.7 ± 0.6 | 1.8 ± 0.7 | 96 ± 20 |
| DJ60 | ||||||||||||
| HS | − 8.3 ± 0.8 | 7.3 ± 0.8 | 114 ± 14 | − 2.3 ± 1.1 | 2.3 ± 1.0 | 91 ± 12 | − 3.1 ± 1.0 | 3.0 ± 1.2 | 106 ± 15 | − 1.7 ± 0.9 | 1.9 ± 0.5 | 88 ± 31 |
| MS | − 8.6 ± 1.0# | 6.9 ± 1.0# | 125 ± 9# | − 1.9 ± 1.1 | 1.9 ± 1.0 | 99 ± 26 | − 3.1 ± 1.0 | 2.8 ± 0.9 | 113 ± 16 | − 2.4 ± 1.0 | 2.2 ± 0.7 | 108 ± 14 |
| LS | − 7.4 ± 0.9 | 5.5 ± 0.9* | 135 ± 6* | − 1.6 ± 0.7 | 2.1 ± 1.2 | 86 ± 30 | − 3.0 ± 1.2 | 2.5 ± 0.8 | 119 ± 17 | − 1.5 ± 0.7 | 1.5 ± 0.6 | 102 ± 19 |
| DJ75 | ||||||||||||
| HS | − 9.3 ± 1.4 | 7.6 ± 1.5 | 123 ± 10 | − 1.7 ± 0.9 | 1.9 ± 1.1 | 100 ± 15 | − 3.3 ± 1.4 | 3.3 ± 1.5 | 100 ± 22 | − 1.4 ± 1.0 | 1.4 ± 0.8 | 107 ± 36 |
| MS | − 9.5 ± 1.1 | 7.2 ± 0.9# | 134 ± 9 | − 1.6 ± 1.6 | 1.9 ± 0.5 | 118 ± 23 | − 4.7 ± 1.7 | 3.8 ± 1.4 | 124 ± 22 | − 1.6 ± 0.9 | 1.4 ± 0.5 | 105 ± 26 |
| LS | − 8.4 ± 1.2 | 6.0 ± 1.0* | 140 ± 10* | − 1.6 ± 1.1 | 1.9 ± 0.8 | 90 ± 30 | − 3.8 ± 1.0 | 2.9 ± 0.8 | 130 ± 6* | − 1.4 ± 0.9 | 1.3 ± 1.0 | 121 ± 40 |
*LS significantly different from HS, #MS significantly different from LS, (p ≤ 0.05).