Table 1. General characteristics and running economy parameters of male and female runners.

	Male runners (n = 24)	Female runners (n = 15)	P
Variables
Fat mass (%)	13.5 ± 6.3	21.8 ± 3.9	<0.01
Fat-free mass (kg)	57.7 ± 5.8	41.7 ± 4.0	<0.01
$\dot{V}{O}_{2}max$ (mL/kg/min)	61.3 ± 6.0	54.5 ± 3.5	<0.01
10 km/h uphill Ec (kcal  kg−0.75km−1)	3.7 ± 0.2	3.8 ± 0.2	0.15
11 km/h flat-floor Ec (kcal  kg−0.75km−1)	3.3 ± 0.3	3.3 ± 0.2	0.95
12 km/h uphill Ec (kcal  kg−0.75km−1) (men, n = 9)	3.5 ± 0.1	–	–
14 km/h flat-floor Ec (kcal  kg−0.75km−1) (men, n = 9)	3.1 ± 0.1	–	–

Notes.

Data are expressed as mean ± standard deviation.

TITLE

E_c

energy running cost.

$\dot{\mathrm{V}}{\mathrm{O}}_{2}max$

maximal oxygen uptake