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Figure 2: (a) Curve of the finger pulse amplitude in percent of baseline value for 2-s-intervals (during first 30 s) resp. 5-s-intervals (during 31st to 120th s) during experimental noise exposure for the four subgroups of the study (means of all eight pass-by noises). (b) Cumulated change of the finger pulse amplitude: Areas under the four curves [Figure 2a] - lines represent the standard deviations

Figure 2: (a) Curve of the finger pulse amplitude in percent of baseline value for 2-s-intervals (during first 30 s) resp. 5-s-intervals (during 31<sup>st</sup> to 120<sup>th</sup> s) during experimental noise exposure for the four subgroups of the study (means of all eight pass-by noises). (b) Cumulated change of the finger pulse amplitude: Areas under the four curves [Figure 2a] - lines represent the standard deviations