Table 2.

Performance variables at a workload corresponding to the Borg scale rate of perceived exertion of 15 at 12 wk (preintervention), ∼24 wk (middle of the intervention) of gestation, and the delta values between the timepoints in sedentary women with obesity

	Control, n = 35			Exercise, n = 38
	12 Wk	24 Wk	Delta	12 Wk	24 Wk	Delta	P Value
% Grade at RPE-15	8 ± 3	7 ± 2	−1 ± 0.3	8 ± 2	10 ± 2	2 ± 0.4	<0.0001
V̇o2 at RPE-15, mL/kg/min	17.4 ± 3.0	16.3 ± 2.5	−1.1 ± 0.4	17.3 ± 3.1	18.3 ± 2.4	1.0 ± 0.4	0.0002
RER at RPE-15	1.1 ± 0.1	1.0 ± 0.1	−0.02 ± 0.02	1.0 ± 0.1	1.1 ± 0.1	0.04 ± 0.02	0.008
Work at RPE-15, W	100 ± 47	94 ± 35	−6 ± 5	109 ± 45	139 ± 9	30 ± 5	<0.0001

Values in the table are means ± SE. A Student’s t test was used to compare the delta values of all performance variables between exercise and nonexercise groups. P values denote delta values of control vs. exercise groups, % grade denote percent grade on treadmill. RER, respiratory exchange ratio (V̇co₂/V̇o₂); RPE, rate of perceived exertion; V̇o₂, oxygen uptake.