Table 1.
Between-session reliability of the L−V relationship variables obtained from different methods, load combinations, and velocity variables during the CMJ exercise.
| Method | Load combination | Velocity variable | L−V variable | Session 1 (mean ± SD) | Session 2 (mean ± SD) | p | CV (95%CI)(%) | ICC (95%CI) |
|---|---|---|---|---|---|---|---|---|
| Multiple-point | Heavy squat (20–40–60–80–load0.55) | MV | L0 (kg) | 191.0 ± 23.5 | 184.2 ± 22.5 | 0.036 | 5.08 (3.87−7.42) | 0.84 (0.65−0.93) |
| v0 (m/s) | 1.61 ± 0.08 | 1.60 ± 0.09 | 0.413 | 3.05 (2.32−4.45) | 0.68 (0.35−0.86) | |||
| Aline (kg × m/s) | 153.9 ± 21.3 | 147.0 ± 19.3 | <0.001 | 3.07 (2.34−4.48) | 0.95 (0.89−0.98) | |||
| MPV | L0 (kg) | 176.6 ± 22.3 | 172.8 ± 21.1 | 0.167 | 4.79 (3.64−6.99) | 0.87 (0.69−0.94) | ||
| v0 (m/s) | 1.84 ± 0.09 | 1.80 ± 0.11 | 0.055 | 3.56 (2.71−5.20) | 0.63 (0.27−0.84) | |||
| Aline (kg × m/s) | 162.8 ± 22.9 | 155.6 ± 20.8 | <0.001 | 3.03 (2.30−4.42) | 0.96 (0.89−0.98) | |||
| PV | L0 (kg) | 195.2 ± 24.0 | 193.0 ± 22.2 | 0.367 | 3.84 (2.92−5.61) | 0.91 (0.78−0.96) | ||
| v0 (m/s) | 3.07 ± 0.17 | 3.03 ± 0.16 | 0.031 | 1.76 (1.34−2.57) | 0.91 (0.78−0.96) | |||
| Aline (kg × m/s) | 300.0 ± 44.1 | 292.5 ± 38.4 | 0.016 | 3.02 (2.29−4.41) | 0.96 (0.90−0.98) | |||
| Heavy CMJ (20–40–60–80) | MV | L0 (kg) | 193.5 ± 20.2 | 184.9 ± 25.1 | 0.031 | 6.21 (4.72−9.07) | 0.75 (0.48−0.89) | |
| v0 (m/s) | 1.60 ± 0.09 | 1.60 ± 0.11 | 0.731 | 3.23 (2.45−4.71) | 0.75 (0.47−0.89) | |||
| Aline (kg × m/s) | 155.0 ± 17.3 | 147.2 ± 18.8 | <0.001 | 3.77 (2.87−5.51) | 0.91 (0.79−0.96) | |||
| MPV | L0 (kg) | 170.0 ± 17.5 | 166.8 ± 20.4 | 0.331 | 5.96 (4.53−8.71) | 0.74 (0.45−0.89) | ||
| v0 (m/s) | 1.86 ± 0.12 | 1.82 ± 0.13 | 0.088 | 3.95 (3.00−5.77) | 0.67 (0.34−0.86) | |||
| Aline (kg × m/s) | 158.3 ± 17.6 | 151.7 ± 18.9 | <0.001 | 3.35 (2.54−4.89) | 0.93 (0.83−0.97) | |||
| PV | L0 (kg) | 184.1 ± 13.8 | 182.4 ± 18.3 | 0.490 | 4.22 (3.21−6.17) | 0.79 (0.54−0.91) | ||
| v0 (m/s) | 3.12 ± 0.20 | 3.08 ± 0.18 | 0.095 | 2.19 (1.67−3.20) | 0.89 (0.74−0.95) | |||
| Aline (kg × m/s) | 287.0 ± 30.2 | 280.6 ± 31.6 | 0.020 | 2.79 (2.12−4.08) | 0.94 (0.86−0.98) | |||
| Two-point | Heavy squat (20–load0.55) | MV | L0 (kg) | 190.7 ± 25.6 | 184.5 ± 23.7 | 0.079 | 5.61 (4.27−8.20) | 0.83 (0.63−0.93) |
| v0 (m/s) | 1.60 ± 0.09 | 1.60 ± 0.10 | 0.783 | 3.37 (2.56−4.92) | 0.72 (0.41−0.88) | |||
| Aline (kg × m/s) | 152.9 ± 23.8 | 147.3 ± 21.5 | 0.018 | 4.47 (3.40−6.54) | 0.92 (0.81−0.97) | |||
| MPV | L0 (kg) | 177.7 ± 24.5 | 174.4 ± 22.6 | 0.279 | 5.34 (4.06−7.80) | 0.86 (0.67−0.94) | ||
| v0 (m/s) | 1.87 ± 0.11 | 1.82 ± 0.12 | 0.084 | 3.94 (3.00−5.76) | 0.64 (0.28−0.84) | |||
| Aline (kg × m/s) | 165.9 ± 26.6 | 159.0 ± 23.8 | 0.013 | 4.86 (3.70−7.11) | 0.91 (0.79−0.96) | |||
| PV | L0 (kg) | 187.8 ± 13.9 | 185.5 ± 18.2 | 0.370 | 4.40 (3.35−6.43) | 0.76 (0.49−0.90) | ||
| v0 (m/s) | 3.14 ± 0.20 | 3.10 ± 0.18 | 0.140 | 2.41 (1.84−3.53) | 0.86 (0.68−0.94) | |||
| Aline (kg × m/s) | 294.8 ± 30.1 | 287.5 ± 32.1 | 0.014 | 2.96 (2.25−4.32) | 0.93 (0.83−0.97) | |||
| Heavy CMJ (20–80) | MV | L0 (kg) | 196.7 ± 19.5 | 185.8 ± 26.6 | 0.023 | 7.30 (5.55−10.67) | 0.66 (0.32−0.85) | |
| v0 (m/s) | 1.59 ± 0.09 | 1.60 ± 0.11 | 0.912 | 3.65 (2.77−5.33) | 0.71 (0.40−0.88) | |||
| Aline (kg × m/s) | 156.7 ± 17.4 | 147.8 ± 19.8 | 0.001 | 4.73 (3.59−6.90) | 0.86 (0.69−0.94) | |||
| MPV | L0 (kg) | 173.7 ± 16.8 | 168.7 ± 21.8 | 0.170 | 6.50 (4.95−9.50) | 0.69 (0.37−0.87) | ||
| v0 (m/s) | 1.87 ± 0.12 | 1.83 ± 0.13 | 0.157 | 4.27 (3.25−6.24) | 0.64 (0.28−0.84) | |||
| Aline (kg × m/s) | 162.1 ± 17.0 | 154.1 ± 19.7 | <0.001 | 3.77 (2.87−5.50) | 0.91 (0.78−0.96) | |||
| PV | L0 (kg) | 196.2 ± 26.9 | 194.9 ± 23.6 | 0.646 | 4.49 (3.41−6.56) | 0.89 (0.75−0.96) | ||
| v0 (m/s) | 3.13 ± 0.18 | 3.08 ± 0.17 | 0.056 | 2.09 (1.59−3.05) | 0.88 (0.72−0.95) | |||
| Aline (kg × m/s) | 307.5 ± 51.5 | 300.9 ± 43.0 | 0.127 | 4.28 (3.25−6.25) | 0.93 (0.84−0.97) |
Notes: p obtained through a paired samples t test. Bold numbers indicate an unacceptable reliability (CV > 10% and ICC < 0.70).
Abbreviations: 95%CI = 95% confidence interval; Aline = area under the L−V relationship line; CMJ = countermovement jump; CV = coefficient of variation; ICC = intra-class correlation coefficient; L−V relationship = load−velocity relationship; L0 = load-axis intercept; load0.55 = estimated load equivalent to 0.55 m/s; MPV = mean propulsive velocity; MV = mean velocity; PV = peak velocity; v0 = velocity-axis intercept.