Figure 3

Changes in respiratory exchange ratio (RER). RER of haplogroup D was significantly lower during the period ranging from 0 to –100 minutes in winter than it was during that same period in summer. RER of haplogroup non-D was significantly lower during the period ranging from 40 to 100 minutes in winter than it was during that same period in summer. #P < 0.05, comparisons between haplogroup D values taken in summer and winter. §P < 0.05, comparisons between haplogroup non-D values taken in summer and winter.