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. 2019 May 29;9(6):290. doi: 10.3390/ani9060290

Table 2.

Adapted description of HRV variables from Stucke et al., (2015) [29].

Variable Definition Interpretation
HR (bpm) Heart rate mean Overall variability of cardiac activity
SDNN (ms) Standard deviation of RR intervals Long-term variability of cardiac activity influenced by the autonomous nervous system
RMSSD (ms) Square root of the mean of the sum of the squares of differences between successive interbeat-intervals (IBI) High frequency of IBI variations correlated to parasympathetic activity
LF/HF ratio Low frequency/high frequency ratio Representation of the balance between sympathetic and parasympathetic nervous systems