Table 2.

Data (mean ±S.E.M.) for blood and plasma variables during the four key protocol time periods

Variable	Group	Baseline	s.e.m.	Theophylline or saline infusion	s.e.m.	Hypoxia	s.e.m.	Recovery	s.e.m.
PCO2(mmHg)	Control	46.7	0.5	47.3	0.5	42.3b	0.6	46.6	0.5
	Theophylline	49.2	0.7	48.5	4.2	45.3bd	0.9	47.2	0.5
Hb (gdl−1)	Control	9.84	0.24	10.10	0.24	10.78a	0.25	9.74	0.22
	Theophylline	9.38	0.21	9.34	1.02	10.30b	0.20	9.64	0.17
pH	Control	7.33	0.00	7.34	0.00	7.34	0.01	7.27b	0.01
	Theophylline	7.32	0.01	7.33	0.00	7.30c	0.01	7.24bc	0.01
Glucose (mg dl−1)	Control	18.7	0.7	20.4	0.9	23.2	1.1	26.4b	1.3
	Theophylline	18.2	1.0	19.1	1.9	25.2b	1.5	28.6b	1.4
Lactate (mmol l−1)	Control	1.2	0.1	1.4	0.2	4.5b	0.5	5.3b	0.4
	Theophylline	1.3	0.1	1.4	0.1	4.6b	0.7	7.2b,c	0.6
Adenosine (μM)	Control	1.11	0.21	1.19	0.25	1.33	0.34	1.27	0.35
	Theophylline	1.13	0.16	1.09	0.16	1.29	0.20	1.21	0.24

^aSignificant difference from baseline (P < 0.05).

^bSignificant difference from baseline (P < 0.01).

^cSignificant difference from corresponding control value (P < 0.05).

^aSignificant difference from corresponding control value (P < 0.01).