Table 2 Estimated parameters and their significance in the resulting model for speed and heart rate with additional loads

VT1 (N = 105)

Speed (km/h) at VT1

Intercept

4.85

0.78

6.21

< 0.001*

Sex

−0.32

0.18

−1.72

0.088

Additional load (kg)

−0.05

0.01

−6.31

< 0.001*

Speed (km/h) at VT1

0.45

0.07

6.88

< 0.001*

R² = 0.485; F (3,101): 31.96, p < 0.001

Heart rate (bpm) at VT1

Intercept

30.77

15.51

1.98

0.050

Sex

3.25

2.68

1.21

0.228

Additional load (kg)

0.28

0.12

2.28

0.025

Speed (km/h) at VT1

0.70

0.10

7.32

 < 0.001*

R² = 0.381; F (3,101): 20.72, p < 0.001

VT2 (N = 88)

Speed (km/h) at VT2

Intercept

4.71

1.09

4.31

< 0.001*

Sex

−0.66

0.20

−3.28

0.001

Additional load (kg)

−0.11

0.01

−13.22

< 0.001*

Speed (km/h) at VT2

0.69

0.07

10.11

< 0.001*

R² = 0.822; F (3,101): 129.42, p < 0.001

Heart rate (bpm) at VT2

Intercept

26.78

13.40

2.00

0.049

Sex

−2.24

1.32

−1.69

0.095

Additional load (kg)

−0.10

0.07

−1.45

0,150

Speed (km/h) at VT2

0.86

0.07

11.98

< 0.001*

R² = 0.645; F (3,101): 50.91, p < 0.001