One variant of HIF1a was found more frequently in weightlifters, while the other was found more frequently in elite endurance athletes and was associated with a higher increase in VO2 max through aerobic exercise training.

Global population distribution:

Source: 1000 Genome Project. Global averages for both sexes

Global population distribution:

Source: 1000 Genome Project. Global averages for both sexes

HIF1A: CC

86%

HIF1A: CT

13%

HIF1A: TT

1%

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