Table 1.

Results of respiratory analyses

	10 min	20 min	30 min	40 min	50 min	60 min	Average
O2 uptake (ml/min)
Morning	2494 ± 51	2623 ± 52	2618 ± 51	2620 ± 54	2614 ± 56	2624 ± 55	2599 ± 51*
Afternoon	2470 ± 45	2577 ± 46	2569 ± 50	2566 ± 54	2564 ± 55	2561 ± 54	2551 ± 49
CO2 production (ml/min)
Morning	2315 ± 70	2439 ± 65	2423 ± 65	2414 ± 72	2414 ± 73	2419 ± 71	2404 ± 68**
Afternoon	2408 ± 66	2541 ± 67	2531 ± 67	2521 ± 73	2508 ± 75	2506 ± 77	2502 ± 69
Ventilation (L/min)
Morning	66.8 ± 3.2	72.0 ± 3.2	73.6 ± 3.5	74.5 ± 4.0	75.1 ± 4.2	75.4 ± 4.2	72.9 ± 3.6
Afternoon	68.6 ± 3.1	74.6 ± 3.2	75.3 ± 3.2	75.1 ± 3.2	75.3 ± 3.5	75.8 ± 3.5	74.1 ± 3.2
Respiratory exchange ratio
Morning	0.93 ± 0.02	0.93 ± 0.01	0.92 ± 0.01	0.92 ± 0.01	0.92 ± 0.01	0.92 ± 0.01	0.92 ± 0.01**
Afternoon	0.97 ± 0.01	0.99 ± 0.01	0.98 ± 0.01	0.98 ± 0.01	0.98 ± 0.01	0.98 ± 0.01	0.98 ± 0.01

Values are shown as mean ± standard errors. *P < 0.05, **P < 0.01 vs afternoon trial