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. Author manuscript; available in PMC: 2014 Sep 9.

Published in final edited form as: Eur J Appl Physiol. 2011 Dec 25;112(8):3087–3095. doi: 10.1007/s00421-011-2280-x

Table 4.

Venous blood gas responses to exercise and hypoxia

	Rest		8 kg		12 kg
	Normoxia	Hypoxia	Normoxia	Hypoxia	Normoxia	Hypoxia
P_vO₂ (Torr)^B
Young	37 ± 2	28 ± 1	27 ± 1^a	23 ± 2^a	28 ± 1^a	22 ± 1^a
Old	34 ± 2	28 ± 1	28 ± 2^a	22 ± 1^a	28 ± 1^a	24 ± 1^a
P_vCO₂ (Torr)^B
Young	41 ± 2	40 ± 2	51 ± 2^a	44 ± 3^a	49 ± 3^a	46 ± 3^a
Old	39 ± 2	36 ± 3	49 ± 4^a	44 ± 3^a	51 ± 3^a	47 ± 3^a
Venous pH (units)^A,^B
Young	7.37 ± 0.01	7.40 ± 0.01	7.32 ± 0.01^a	7.35 ± 0.01^a	7.30 ± 0.01^a,^b	7.32 ± 0.01^a,^b
Old	7.39 ± 0.01	7.40 ± 0.01	7.35 ± 0.02^a	7.35 ± 0.01^a	7.31 ± 0.01^a,^b	7.34 ± 0.02^a,^b

Data are presented as mean ± SE. Young n = 17, old n = 12

Main effect of exercise:

^a

p < 0.05 versus rest,

^b

p < 0.05 versus 8 kg

^A

Main effect of group (young vs. old),

^B

main effect of gas condition (normoxia vs. hypoxia)