Maximal Oxygen Uptake, Lung Volume and Ventilatory Response to Carbon Dioxide and Hypoxia in a Pair of Identical Twin Athletes

1. Maximal oxygen uptake (V̇o₂ max.), lung volumes, and ventilatory responses to carbon dioxide and hypoxia have been measured in identical twin athletes, who were trained to a similar high degree.

2. The results confirm previous findings for V̇o₂ max. and lung volumes in identical twins, and are in keeping with the suggestion that genetic factors play a major part in determining the ventilatory response to carbon dioxide and hypoxia.