First of all, the Hand-Grip or Exercise Heart Rate Monitor was connected to the TI graphing calculator to the computer interface. Second, The subject was sitting in a relaxed position in a chair. She has took a fast breath about 60 second, and the tester has noticed and recognized what happen during hyperventilation. After that, the tester has recognized what happen during hypoventilation by letting the subject to breath slowly about 60 second, and take a deep breath and hold it as possible. Finally, the data was collected from the graph.
