Fig. 1. Sample recording of ventilation in tegus. (A) Septum removed (SR), (B) sham-operated (SO). The sequence contains pre-exercise (Pre), exercise at 0.17 m s^-1 (0.17 m s^-1), 5 min of rest (Rest 1), exercise at 0.28 m s^-1 (0.28 m s^-1) and the final recovery period (Rest 2). The transitions end of exercise to recovery period are expanded below each main trace. Upper traces, signal from oxygen analyser; lower traces, signal from pressure transducer. Above the ventilation trace a broken line indicates an exercise period and the solid line a resting period. Insp., inspiration; Exp., expiration.

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