Table 1 Metabolic responses during 30, 60, and 90 min treadmill walking in the activity trials

Mean

SEM

Mean

SEM

Mean

SEM

Energy expenditure [kJ per exercise session]

879^a

46

1799^b

83

2630^c

126

Energy expenditure [kJ·min^-1]

29

2

30

1

29

1

Respiratory exchange ratio

0.95^a

0.01

0.92^b

0.01

0.91^b

0.01

Fat oxidation [g per exercise session]

4^a

1

12^b

2

21^c

2

Fat oxidation [g·min^-1]

0.12^a

0.03

0.20^ab

0.03

0.23^b

0.02

Carbohydrate oxidation [g per exercise session]

44^a

3

80^b

6

110^c

6

Carbohydrate oxidation [g·min^-1]

1.46^a

0.11

1.33^ab

0.10

1.22^b

0.06

Heart rate [min^-1]

122

4

125

4

127

3

Heart rate [% HRmax]

64

2

65

2

66

1

Rating of perceived exertion*

11.0^a

0.4

11.5^ab

0.4

11.8^b

0.4