Figure 1

Changes in VO ₂ (ΔVO ₂ ). White circles connected by the solid line indicate summer data associated with haplogroup D (n = 8) and white triangles connected by the dotted line indicate summer data associated with haplogroup non-D (n = 9). Black circles connected by the solid line indicate winter data associated with haplogroup D (n = 8) and black triangles connected by the dotted line indicate winter data associated with haplogroup non-D (n = 9). ΔVO₂ of haplogroup D was significantly higher than that of haplogroup non-D during the period ranging from 90 to 100 minutes in winter. ΔVO₂ of haplogroup D was significantly higher during the period ranging from 40 to100 minutes in winter than it was during that same period in summer. ΔVO₂ of haplogroup non-D was significantly higher at both 70 minutes and 100 minutes in winter than it was at those same intervals in summer. *P < 0.05, comparisons between haplogroups D and non-D in winter. #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.