Figure 7. Arterial blood gases, oxyhaemoglobin saturation and respiratory mechanics during the constant load exercise bout.

In A, B and C, subjects are divided based on the appearance of expiratory flow limitation during the constant load exercise bout. All subjects are pooled for D, E and F. EFL, expiratory flow limitation; NEFL, no expiratory flow limitation; , arterial oxygen tension; , alveolar oxygen tension; , arterial carbon dioxide tension; , arterial oxyhaemoglobin saturation; EIAH, exercise-induced arterial hypoxaemia; , expired minute ventilation; , ventilatory capacity; WOB, work of breathing; WOB_El, elastic work of breathing; WOB_Res, resistive work of breathing. §Different from both room air stages; *different from heliox stage; †different from at similar stage; ‡different from the to eliminate EIAH at similar stage P < 0.05.