Table 2: Oxygen uptake, energy expenditure, and heart rate of 9 female runners and 10 female walkers during 60 min of exercise and 60 min of bed rest. VO2: volume of oxygen uptake; RER: respiratory exchange ration; RQ: respiratory quotient; HR: heart rate; RPE: rating of perceived exertion.

RestExercise
Runners*Walkers*Runners*Walkers*RunnersEx versus w a l k e r s E x 𝑃 value

VO2 (L·min−1) 0 . 2 3 ± 0 . 0 2 0 . 2 2 ± 0 . 0 4 1 . 9 ± 0 . 1 6 1 . 3 9 ± 0 . 3 4 0.48 (0.22, 0.73)0.001
RER/RQ 0 . 7 8 ± 0 . 0 5 0 . 7 4 ± 0 . 0 5 0 . 9 0 ± 0 . 0 3 0 . 8 8 ± 0 . 0 4 −0.01 (−0.04, 0.02)0.57
Energy expenditure (kcal/h) 6 5 . 5 ± 6 . 7 6 2 . 3 ± 1 1 . 5 4 8 3 . 1 ± 4 9 . 7 3 2 4 . 6 ± 1 3 8 . 1 158.5 (56.2, 260.7)0.01
HR (bpm) 6 8 . 6 ± 2 4 . 3 7 2 . 3 ± 7 . 9 1 7 1 . 8 ± 1 1 . 3 1 6 1 . 9 ± 1 6 . 1 9.9 (−4.17, 24.0)0.15
RPE 1 3 . 1 ± 1 . 1 1 4 . 1 ± 2 . 7 −0.97 (−3.13, 1.19)0.35
Lactate (mmol/L) 0 . 7 6 ± 0 . 2 6 0 . 9 2 ± 0 . 4 1 . 4 ± 0 . 6 6 1 . 0 ± 0 . 5 5 0.4 (−0.21, 1.0)0.19
Glucose (mmol/L) 5 . 1 ± 0 . 5 6 5 . 0 ± 0 . 6 7 6 . 7 ± 1 . 8 5 . 7 ± 0 . 6 6 1.03 (−0.38, 2.4)0.14

*Mean ± SD.
Difference in means (95% confidence interval) from two-sample t-test.
VO2: oxygen uptake; RER: respiratory exchange ratio; RQ: respiratory quotient; HR: heart rate; RPE: rate of perceived exertion.