. 2005 Oct 6;4:24. doi: 10.1186/1476-511X-4-24

Table 1.

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

	30 min		60 min		90 min

	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

SEM, standard error of the mean; HRmax, maximum heart rate.

*Borg rating of relative perceived exertion, 6–20 scale.

Significant difference between means not sharing a common letter (P < 0.05; n = 15 for respiratory data in 30 and 60 min walking trials; n = 16 for other data).