Table 2.
Differences, associations, and heteroscedasticity of the errors between the actual and predicted 1RMs during the back squat exercise.
| Group | 1RM Prediction Method | Raw Diff (kg) | p-Value | ES |
r
(Pearson) |
r
(heteroscedasticity) |
|---|---|---|---|---|---|---|
| Whole | Multiple-point (n = 38) | −1.3 ± 18.8 | 0.570 | −0.04 | 0.92 | 0.45 ^ |
| Distant two-point (n = 38) | −1.7 ± 14.4 | 0.463 | −0.05 | 0.91 | 0.42 ^ | |
| Load-load (n = 31) | −1.0 ± 24.1 | 0.814 | −0.03 | 0.74 | 0.39 ^ | |
| High-load (n = 38) | −4.0 ± 13.4 | 0.071 | −0.13 | 0.93 | 0.48 ^ | |
| Young | Multiple-point (n = 19) | 1.1 ± 12.1 | 0.689 | 0.04 | 0.95 | 0.66 ^ |
| Distant two-point (n = 19) | 0.1 ± 10.8 | 0.965 | 0.00 | 0.96 | 0.68 ^ | |
| Load-load (n = 18) | −0.5 ± 24.9 | 0.927 | −0.02 | 0.71 | 0.36 ^ | |
| High-load (n = 19) | −0.9 ± 12.5 | 0.755 | −0.03 | 0.95 | 0.65 ^ | |
| Middle-aged | Multiple-point (n = 19) | −3.7 ± 15.3 | 0.306 | −0.16 | 0.78 | 0.21 |
| Distant two-point (n =19) | −3.6 ± 17.4 | 0.382 | −0.16 | 0.73 | 0.26 | |
| Load-load (n = 13) | −1.7 ± 23.8 | 0.802 | −0.07 | 0.62 | 0.59 ^ | |
| High-load (n = 19) | −7.2 ± 13.9 | 0.037 * | −0.32 | 0.81 | 0.18 |
Data are mean ± standard deviation. Raw diff, Raw differences; ES, Cohen’s d effect size ([Predicted 1RM—Actual 1RM]/SD both); rPearson, Pearson’s correlation coefficient; rheteroscedasticity, heteroscedasticity of the errors; *, p is < 0.05; ^ denotes heteroscedasticity (i.e., r > 0.32).