A. False Not unless the individual has been training at high altitude; for some activities a maximal haematocrit is set to discourage artificial means of raising the oxygen carrying ability of blood.
B. False This also is likely to be normal (around 98 per cent in arterial blood).
C. False Ventilation is not usually a limiting factor for endurance activity.
D. False There will only be sympathetic tone to the heart at maximal exercise.
E. True This permits a low resting pulse rate and a high maximal cardiac output.
