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The experiment was conducted at the Governmental Flying School ( RLS), with 14 young air cadets two sessions each.
Main differences with previous experiments: a different type of flight simulator was used (AT-10). The holding pattern was left out. Pilots were younger and less experienced. Respiratory rate (RR) was also measured.
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The figures 1, 2 and 3 shows the relationship between the physiological variables and the flight phases.
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FIGURE 1. FIGURE 2.
1. The 3 physiological variables differentiate significantly between the sample flight phases,
2. The differentiating power of RR is greatest followed closely by SA.
The differentiating power of HR is not so strong, though still significant (p < 0.005).
3. The change in the physiological variables from one phase to another is generally in the predicted direction.
Previous experiments were conducted to validate the sensitively of heart rate, heart rate irregularity, and respiratory rate as indicators of mental load. A type of mental load was selected which was assumed to constitute mainly of information handling. For this purpose experimenter controlled flight-simulator flights' were chosen. In these flights more and less difficult procedures were incorporated. It is concluded that when differences in mental load are very small ( such as between straight and level flight and simple turns- rate 1- ) differentiating is inadequate. When differences are more pronounced ( such as between level flight, holding and let down) differentiating is significant and generally in a predicted direction.
The highest discriminating power according to the W2 criterion is shown by respiratory rate, followed closely by heart rate regularity and to a lesser extend by heart rate itself.
Validation of constructs II "Main Page"
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