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Standard deviation of normal-to-normal cardiac intervals (Panel A; SDNN), root mean square of differences between adjacent cardiac intervals (Panel B; RMSSD) and percentage of adjacent cardiac intervals with difference exceeding 50 ms (Panel C; pNN50). Response to heavy metal music ms = milliseconds. *P < 0.05 - control vs. 10 min, **P < 0.05 vs. music, †P < 0.01 vs. music, ††P < 0.01 vs. control, #P < 0.001 vs. rest, ##P < 0.001 - music vs
