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Fig. 2 | Environmental Health

Fig. 2

From: Cardiovascular health effects following exposure of human volunteers during fire extinction exercises

Fig. 2

Cardiovascular endpoints in the three exposure scenarios (before and after as control measurements, and exposure measurement). Natural base log of reactive hyperemia index (one subject was eliminated due to missing data in both control measurements) (a), time domain heart rate variability in pNN50 (b) and RMSSD (c), frequency domain heart rate variability (d), augmentation index corrected for 75 bpm (e) and baseline heart rate (f). Grey symbols and dashed lines are individual results in each subject. Black line is a graphical output of the mixed effect model. pNN50, proportion of successive NN intervals differing by more than 50 milliseconds divided by total number of NN intervals; RMSSD, square root of the mean squared differences of successive NN intervals; bpm, beat per minute; ms, millisecond

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