Table 2.

Mean intensity during each phase of the treadmill protocol in both groups.

Intensity	Group						p-value
	Pregnant			Non-pregnant
	No.	% HR max	SD	No.	% HR max	SD
Interval
1st	15			15
% HRmax		86	5		90	3	0.004
RPE		15	2		16	1	0.101
2nd	15			15
% HRmax		89	4		93	2	0.001
RPE		16	2		17	0	0.109
3rd	13			15
% HRmax		90	3		94	2	0.000
RPE		17	1		17	0	0.053
4th	8			15
% HRmax		90	2		94	2	0.001
RPE		17	1		17	1	0.278
5th	4			15
% HRmax		92	2		94	2	0.032
RPE		17	1		17	1	0.063

% HRmax, percent of estimated maximal heart rate; RPE, Borg's rating of perceived exhaustion.

SD, Standard Deviation.