Table 2. Changes in the cardiorespiratory variables and energy cost, measured during the 10-CR condition of the modules.

	Module	Mean ± SD	95% CI	% change	p	${\mathrm{\eta }}_p^2$
$\dot{\mathrm{V}}{\mathrm{O}}_2$ (mL kg−1 min−1)	1	32.1 ± 3.3	29.4 ± 34.9		0.020*	0.367L
	2	31.2 ± 2.6	29.0 ± 33.4	−2.6
	3	32.7 ± 3.1	30.2 ± 35.3	+2.2
	4	33.3 ± 3.3	30.5 ± 36.0	+3.6
${\dot{\mathrm{V}}}_{\mathrm{E}}$ (L min−1)	1	49.2 ± 6.47	43.8 ± 54.6		0.061	0.290L
	2	50.0 ± 6.45	44.6 ± 55.4	+2.0
	3	52.6 ± 7.63	46.3 ± 59.0	+7.1
	4	53.8 ± 6.17	48.6 ± 58.9	+10.0
${\dot{\mathrm{V}}}_{\mathrm{E}}:\dot{\mathrm{V}}{\mathrm{O}}_2$	1	25.8 ± 1.5	24.5 ± 27.0		0.218	0.187L
	2	27.0 ± 3.0	24.6 ± 29.5	+5.0
	3	27.1 ± 3.3	24.3 ± 29.8	+4.9
	4	27.5 ± 3.1	24.9 ± 30.0	+6.6
RER	1	0.92 ± 0.06	0.87 ± 0.98		0.023*	0.359L
	2	0.89 ± 0.05	0.85 ± 0.93	−3.8
	3	0.87 ± 0.04	0.84 ± 0.90	−5.7
	4	0.86 ± 0.03	0.84 ± 0.89	−6.3
OXFAT (g min−1)	1	0.29 ± 0.23	0.13 ± 0.45		0.030*	0.342L
	2	0.41 ± 0.16	0.30 ± 0.52	+71
	3	0.50 ± 0.12	0.42 ± 0.58	+106
	4	0.52 ± 0.14	0.43 ± 0.62	+114
Cr (mL kg−1 m−1)	1	0.172 ± 0.020	0.158 ± 0.185		0.004*	0.464L
	2	0.166 ± 0.016	0.155 ± 0.177	−3.4
	3	0.175 ± 0.019	0.163 ± 0.188	+2.1
	4	0.179 ± 0.020	0.165 ± 0.192	+3.8
CrJ (J kg−1 m−1)	1	3.56 ± 0.40	3.23 ± 3.89		0.062	0.289L
	2	3.41 ± 0.34	3.13 ± 3.70	−3.7
	3	3.59 ± 0.40	3.26 ± 3.92	+1.1
	4	3.64 ± 0.40	3.31 ± 3.98	+2.6
%HRMAX (%)	1	82.5 ± 8.3	75.5 ± 89.5		0.001*	0.817L
	2	86.4 ± 8.1	79.6 ± 93.2	+4.8
	3	88.6 ± 7.3	82.5 ± 94.7	+7.6
	4	89.5 ± 6.7	81.1 ± 97.8	+13.6

Notes.

Data are group mean ± SD.

^*significant main effect of duration, at p < 0.05.

^Llarge effect.

$\dot{\mathrm{V}}{\mathrm{O}}_2$

Oxygen utilization

${\dot{\mathrm{V}}}_{\mathrm{E}}$

Minute ventilation

${\dot{\mathrm{V}}}_{\mathrm{E}}:\dot{\mathrm{V}}{\mathrm{O}}_2$

Ventilatory equivalent

RER

Respiratory Exchange Ratio

C_r and C_r^J

Energy cost of running

%HR_MAX

Heart rate relative to individual maximum