Table 2.
Comparison of the L−V relationship variables obtained by different 2-point methods compared to their respective multiple-point methods for each velocity variable during the countermovement jump exercise.
| Load combination | Velocity variable | L−V variable | p | ES | r (95%CI) | CCC (95%CI) | Bias (95%LoA) |
|---|---|---|---|---|---|---|---|
| Heavy squat (20–load0.55) | MV | L0 (kg) | 0.675 | −0.01 | 0.99 (0.98−1.00) | 0.99 (0.98−1.00) | −0.1 (−3.9 to 3.7) |
| v0 (m/s) | 0.911 | 0.01 | 0.96 (0.90−0.98) | 0.95 (0.89−0.98) | 0.00 (−0.04 to 0.04) | ||
| Aline (kg × m/s) | 0.792 | −0.01 | 0.98 (0.94−0.99) | 0.97 (0.93–0.99) | −0.1 (−5.7 to 5.5) | ||
| MPV | L0 (kg) | 0.105 | −0.07 | 0.99 (0.96−0.99) | 0.98 (0.95−0.99) | −0.5 (−5.3 to 4.3) | |
| v0 (m/s) | 0.008 | −0.19 | 0.96 (0.91−0.99) | 0.94 (0.86−0.98) | −0.01 (−0.05 to 0.04) | ||
| Aline (kg × m/s) | 0.029 | −0.16 | 0.97 (0.91−0.99) | 0.94 (0.87−0.98) | −1.2 (−9.3 to 6.9) | ||
| PV | L0 (kg) | 0.026 | 0.37 | 0.78 (0.51−0.91) | 0.71 (0.42−0.87) | 2.6 (−14.8 to 20.0) | |
| v0 (m/s) | <0.001 | −0.41 | 0.93 (0.82−0.97) | 0.85 (0.65−0.94) | −0.02 (−0.13 to 0.08) | ||
| Aline (kg × m/s) | 0.169 | 0.14 | 0.91 (0.79−0.97) | 0.89 (0.76−0.95) | 1.8 (−16.8 to 20.3) | ||
| Heavy CMJ (20–80) | MV | L0 (kg) | 0.168 | −0.04 | 1.00 (0.99−1.00) | 0.99 (0.99−1.00) | −0.3 (−3.6 to 3.0) |
| v0 (m/s) | 0.834 | 0.01 | 0.99 (0.97−1.00) | 0.99 (0.97−0.99) | 0.00 (−0.02 to 0.02) | ||
| Aline (kg × m/s) | 0.274 | 0.03 | 0.99 (0.99−1.00) | 0.99 (0.98−1.00) | 0.2 (−2.5 to 2.9) | ||
| MPV | L0 (kg) | 0.005 | −0.09 | 0.99 (0.99−1.00) | 0.99 (0.97−1.00) | −0.6 (−4.0 to 2.8) | |
| v0 (m/s) | 0.012 | 0.07 | 0.99 (0.99, 1.00) | 0.99 (0.98−1.00) | 0.00 (−0.02 to 0.02) | ||
| Aline (kg × m/s) | <0.001 | −0.12 | 0.99 (0.98−1.00) | 0.99 (0.96−0.99) | −0.8 (−4.2 to 2.6) | ||
| PV | L0 (kg) | 0.005 | 0.60 | 0.67 (0.33−0.86) | 0.55 (0.20−0.70) | 4.3 (−18.9 to 27.6) | |
| v0 (m/s) | 0.382 | 0.03 | 0.99 (0.96−0.99) | 0.98 (0.96−0.99) | 0.00 (−0.03 to 0.04) | ||
| Aline (kg × m/s) | 0.002 | −0.54 | 0.81 (0.57−0.92) | 0.67 (0.38−0.84) | −7.0 (−41.5 to 27.5) |
Abbreviations: 95%CI = 95% confidence interval; 95%LoA = 95% limits of agreement (± 1.96 × SD); Aline = area under the L−V relationship line; CCC = Lin's concordance correlation coefficient; ES = Cohen's d effect size; 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.