Table 2. Comparison of the directly measured bilateral leg-press one-repetition maximum (117.4 ± 24.8) with the 1RM estimated using different velocity variables, regression models, and minimal velocity thersholds.
| Velocity | Regression models | MVT | Predicted 1RM (kg) | Raw Diff (kg) |
ES [95% IC] | r [95% IC] | r2 |
|---|---|---|---|---|---|---|---|
| MV | Multiple-point linear | General V1RM | 119.3 ± 24.6 | 1.96 ± 8.10 | 0.08 [−0.53 to 0.68] | 0.95 [0.87–0.98] | 0.004 |
| Individual V1RM | 119.3 ± 23.2 | 1.95 ± 9.76 | 0.08 [–0.53 to 0.68] | 0.92 [0.80–0.97] | 0.008 | ||
| Two-point | General V1RM | 121.5 ± 25.7 | 4.09 ± 7.99 | 0.16 [–0.45 to 0.77] | 0.95 [0.89–0.98] | 0.044 | |
| Individual V1RM | 121.6 ± 24.4 | 4.19 ± 9.70 | 0.17 [–0.44 to 0.77] | 0.92 [0.81–0.97] | 0.001 | ||
| Multiple-point polynomial | General V1RM | 126.9 ± 40.3 | 9.49 ± 25.01 | 0.28 [–0.33 to 0.89] | 0.82 [0.59–0,92] | 0.462 | |
| Individual V1RM | 124.4 ± 35.6 | 6.99 ± 20.42 | 0.22 [–0.38 to 0.83] | 0.83 [0.63–0.93] | 0.344 | ||
| PV | Multiple-point linear | General V1RM | 113.7 ± 20.8 | –3.70 ± 11.76 | –0.16 [–0.76 to 0.45] | 0.87 [0.71–0.95] | 0.084 |
| Individual V1RM | 114.2 ± 22.1 | –3.15 ± 8.68 | –0.13 [–0.74 to 0.47] | 0.93 [0.84–0.97] | 0.057 | ||
| Two-point | General V1RM | 115.3 ± 20.9 | –2.08 ± 10.61 | –0.09 [–0.70 to 0.52] | 0.90 [0.76–0.96] | 0.097 | |
| Individual V1RM | 115.9 ± 22.6 | –1.44 ± 7.69 | –0.06 [–0.67 to 0.54] | 0.95 [0.87–0.98] | 0.041 | ||
| Multiple-point polynomial | General V1RM | 117.4 ± 24.5 | –0.03 ± 16.29 | 0.00 [–0.60 to 0.60] | 0.78 [0.52–0.90] | 0.001 | |
| Individual V1RM | 118.5 ± 27.1 | 1.07 ± 12.03 | 0.04 [–0.56 to 0.65] | 0.90 [0.76–0.96] | 0.065 |
Note:
Data are mean ± standard deviation. MV, mean velocity; PV, peak velocity; RM, one-repetition maximum; MVT, minimal velocity thresholds; Raw diff, raw differences (Predicted 1RM–Actual 1RM); ES, Hedge’s g effect size with 95% confidence intervals ((Predicted 1RM–Actual 1RM)/SD both); r, Pearson’s correlation coefficient with 95% confidence intervals between actual RM and predicted 1RM; r2, coefficient of determination obtained from the relationship of the raw differences between the actual and predicted 1RMs with their average value; V1RM, velocity of the one-repetition maximum.