TABLE 4.
Multiple linear regression analysis: percentage of change in speed variables with accumulated load, baseline fitness levels, and PHV.
| Variable | β | Estimate | | t| | P-value | 95% CI for estimated | Total predict |
| LSS (%) | β0 | −94.42 | 0.65 | 0.529 | −408.2 to 219.3 | R2 = 0.18 Adjusted R2 =−0.29P = 0.92 AIC = 156.71 |
| ACL (A.U.) | β1 | 0.001 | 0.48 | 0.639 | −0.003 to 0.004 | |
| Maturity offset (yrs) | β2 | 5.20 | 0.84 | 0.414 | −8.18 to 18.58 | |
| PHV (yrs) | β3 | 5.58 | 0.7 | 0.498 | −11.60 to 22.76 | |
| VO2max (mL kg–1 min–1) | β4 | −0.89 | 1.51 | 0.153 | −2.15 to 0.37 | |
| HRmax (bpm) | β5 | 0.31 | 0.93 | 0.371 | −0.41 to 1.03 | |
| HRrest (bpm) | β6 | −0.22 | 0.59 | 0.566 | −1.04 to 0.59 | |
| LSS (s) | β7 | 0.11 | 0.01 | 0.989 | −18.11 to 18.33 | |
| LSM (s) | β8 | −3.15 | 0.60 | 0.557 | −14.37 to 8.08 | |
| Variable | β | Estimate | | t| | P-value | 95% CI for estimated | Total predict |
| LSM (%) | β0 | −104.2 | 1.08 | 0.298 | −310.8 to 102.4 | R2 = 0.24 Adjusted R2 =−0.20P = 0.80 AIC = 137.48 |
| ACL (A.U.) | β1 | =0001 | 0.95 | 0.359 | −0.001 to 0.003 | |
| Maturity offset (yrs) | β2 | 2.56 | 0.62 | 0.544 | −6.25 to 11.37 | |
| PHV (yrs) | β3 | 7.65 | 1.45 | 0.169 | −3.67 to 18.96 | |
| VO2max (mL kg–1 min–1) | β4 | 0.28 | 0.73 | 0.478 | −0.5484 to 1.11 | |
| HRmax (bpm) | β5 | 0.09 | 0.41 | 0.686 | −0.38 to 0.57 | |
| HRrest (bpm) | β6 | 0.05 | 0.21 | 0.838 | −0.49 to 0.59 | |
| LSS (s) | β7 | 2.06 | 0.37 | 0.718 | −9.93 to 14.06 | |
| LSM (s) | β8 | −3.61 | 1.05 | 0.313 | −10.99 to 3.78 | |
Significant differences (p = 0.05) are highlighted in bold.
PHV, Peak height velocity; VO2max, Maximal oxygen consumption; HRmax, Maximal heart rate; HRrest, resting heart rate; LSS, Linear sprint short test; LSM, linear sprint medium test; ACL, The accumulated load of 20 weeks; %, The percentage of change in between assessments from EaS to EnS; CI, Confidence interval; AIK, Akaike information criterion; A.U., Arbitrary unit.