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I sing in a choir http://buffalovisiongames.com/blog/potensmedel-auvitra/ auvitra dosage Heart rate was measured continuously throughout the study using ear clips that give an optical reading (eM wave technique), meaning that heart rate could be recorded simultaneously for all participants. Heart rate variability measurements were calculated using two techniques: root mean square of the successive differences (RMSSD) and low frequency to high frequency ratio (LF/HF). Frequency scores were also calculated to summarise the regularity of the heart rate fluctuations. The researchers then compared the singing tasks to each other using statistical methods.