Figure 6From: 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 landing period in pilot B with the BK117. Dotted arrow indicates the flight situation. Solid arrow indicates the call of pilot. Outline arrow indicates head down movement (1~2 seconds) of the pilot.Back to article page