Fig. 5
From: Relationship between mitochondrial haplogroup and physiological responses to hypobaric hypoxia
Changes in minute ventilation (\( \overset{.}{\mathrm{V}}\mathrm{E} \)) and R (means ± standard error) in haplogroups D (black squares; n = 16) and M7+G (white circle; n = 9). There was no effect of group, time, or their interaction on \( \overset{.}{\mathrm{V}}\mathrm{E} \). R changed significantly over time. R was significantly higher at 4000 m than at 2500 m in haplogroup D, but not in M7+G