Figure 4From: Monitoring of pre-frontal oxygen status in helicopter pilots using near-infrared spectrophotometersThe concentration changes of oxy-hemoglobin (O 2 Hb) and deoxy-hemoglobin (HHb) during the takeoff period in pilot A with the BK117. The dotted arrow indicates the flight situation. The solid arrow indicates a call by the pilot. The outline arrow indicates the downward head movement (1~2 seconds) of the pilot.Back to article page