. 2020 May 29;17(11):3865. doi: 10.3390/ijerph17113865

Table 3.

Physiological responses at submaximal velocities, before (pre) and after (post) eight weeks of either continuous training (CT) or sprint interval training (SIT).

		1		2		3		4
		Pre	Post	Pre	Post	Pre	Post	Pre	Post
CT	VO₂ (mL·min⁻¹)	1553 ± 139	1381 ± 159 *^,#	2307 ± 177	1876 ± 157 *	2414 ± 175	2275 ± 174 *	2754 ± 186	2620 ± 172 *
	% VO_2max	45.1 ± 3.4	37.8 ± 2.1 *	58.4 ± 3.1	52.4 ± 2.8 *	71.1 ± 2.3	64.6 ± 2.4 *	79.4 ± 2.0	73.3 ± 1.8 *
	RE (mL·kg⁻¹·km⁻¹)	213 ± 16	186 ± 10 *^,#	229 ± 12	213 ± 10 *	238 ± 8	224 ± 8 *	232 ± 6	223 ± 6 *
	% HR_peak	66.9 ± 2.1	59.6 ± 2.3 *	76.8 ± 2.2	70.8 ± 2.5 *	85.3 ± 1.5	80.2 ± 2.1 *	90.0 ± 1.0	86.3 ± 1.4 *
	O₂pulse (mL·beat⁻¹)	11.5 ± 0.7	11.5 ± 1.0	13.1 ± 0.8	13.3 ± 0.9	14.2 ± 0.8	14.1 ± 0.9	15.3 ± 0.9	15.2 ± 0.9
	RER (VCO₂·VO₂⁻¹)	0.89 ± 0.01	0.84 ± 0.01 *	0.93 ± 0.01	0.88 ± 0.01 *	0.94 ± 0.01	0.90 ± 0.01 *	0.97 ± 0.01	0.93 ± 0.01 *
	Lactate (mmol·l⁻¹)	1.22 ± 0.13	0.77 ± 0.06 *	1.76 ± 0.26	1.16 ± 0.13 *	2.39 ± 0.25	1.75 ± 0.17 *	3.84 ± 0.30	2.66 ± 0.24 *
SIT	VO₂ (mL·min⁻¹)	1544 ± 152	1523 ± 150	2221 ± 168	2076 ± 158	2574 ± 181	2500 ± 165	2909 ± 204	2832 ± 196 *^,#
	% VO_2max	42.6 ± 2.2	40.1 ± 2.5 *	61.9 ± 1.6	55.3 ± 2.0 *	71.8 ± 1.2	66.5 ± 1.5 *	81.2 ± 0.9	75.2 ± 1.2 *
	RE (mL·kg⁻¹·km⁻¹)	201 ± 10	199 ± 10	243 ± 8	228 ± 8 *	240 ± 5	234 ± 4	237 ± 4	231 ± 4 *
	% HR_peak	61.6 ± 2.4	61.6 ± 2.5	75.0 ± 1.6	72.0 ± 2.0	82.6 ± 1.2	81.1 ± 1.5	88.6 ± 0.9	87.2 ± 1.2
	O₂pulse (mL·beat⁻¹)	12.8 ± 1.0	12.6 ± 1.0	14.9 ± 1.0	14.5 ± 1.1	15.8 ± 1.0	15.6 ± 0.9	16.6 ± 1.0	16.4 ± 1.0
	RER (VCO₂·VO₂⁻¹)	0.86 ± 0.02	0.83 ± 0.02	0.91 ± 0.01	0.87 ± 0.02 *^,#	0.92 ± 0.01	0.89 ± 0.01 *	0.96 ± 0.01	0.92 ± 0.01 *
	Lactate (mmol·l⁻¹)	1.12 ± 0.08	0.89 ± 0.06 *	1.79 ± 0.15	1.20 ± 0.07 *^,#	2.38 ± 0.17	1.68 ± 0.12 *	3.45 ± 0.24	2.66 ± 0.19 *^,#

Values are mean ± SEM. VO₂, oxygen consumption; % VO_2max, percent of maximal oxygen consumption; RE, running economy; % HF_peak, percent of peak heart rate; O₂ pulse, oxygen pulse; RER, respiratory exchange ratio. Velocities at stage 1, 2, 3 and 4 equaled 6.2 ± 0.2, 7.5 ± 0.2, 8.8 ± 0.3 and 10.1 ± 0.3 km·h⁻¹ in CT, and 6.4 ± 0.2, 7.7 ± 0.2, 9.1 ± 0.3 and 10.4 ± 0.3 km·h⁻¹ in SIT. CT, n = 11. SIT, n = 13. Values for % HF_peak and O₂ pulse represents only 12 subjects in SIT. * Statistically significant difference from pre (student’s t-test), p < 0.05. ^# Statistically significant difference from pre (verified by Wilcoxon signed rank test), p < 0.05. There were no statistically significant differences between groups.