Experimental Study on the Effects of Cockpit Noise on Physiological Indicators of Pilots.

Figure 10 is a boxplot of the β/(θ + α) ratio across different noise sound pressure levels which shows that the β/(θ + α) ratios are significantly different between noise groups ( p < 0.01) and shows an increasing trend with an increasing noise sound pressure level. 3.2.

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Figure 9 shows that the α/β ratio is significantly different between noise groups ( p < 0.01) and shows a decreasing trend with an increasing noise sound pressure level.

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The data analysis showed that when the noise intensity reached 80 dB(A), the SDNN values in quiet conditions and noise-exposed environments showed highly significant differences, and the SDNN showed a systematic decreasing trend with an increasing noise intensity, suggesting that noise exposure can significantly weaken the overall regulatory ability of the autonomic nervous system.

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