Table 4. Predictor functions.

Fixed-effect coefficients learned from the complete dataset.

Combination	Function
F1	79.64 − 13.04 × G − 0.3728 × BM
F2	$43.77-9.741\times \mathrm{G}-0.3182\times \text{BM}+4381\times {\text{HR}}_0^{-1}$
F3	77.58 − 9.769 × G − 0.2676 × BM − 14.41 × RMSbl,y,1
F4	$25.78-8.861\times \mathrm{G}-0.2538\times \text{BM}+5546\times {\text{HR}}_0^{-1}+4.879\times {\text{VAR}}_{\mathrm{t},\text{total},0}^{-1}$

G = gender, BM = body mass, ${\text{HR}}_0^{-1}$ = inverse of the average heart rate of the warm-up stage, RMS_bl,y,1 = root mean squared acceleration of the mediolateral lower back acceleration in stage 1, ${\text{VAR}}_{\mathrm{t},\text{total},0}^{-1}$ = inverse of the variance of the total tibia acceleration in the warm-up stage.