Physiologymiddle twist
A 46-year-old man attends the clinic nine months after cardiac transplantation. He feels well, has no chest pain and walks four kilometres most days. He takes no medicine that affects heart rate. His chest is clear, the jugular venous pressure is not raised and there is no ankle oedema. He is about to start a supervised exercise programme and undergoes a treadmill test.
Which one of the following heart rate responses would you expect in this man as he exercises and then stops?