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Adapted description of heart rate variability (HRV) variables from Stucke et al., 2015 and Usui and Nishida, 2017 [23,28].
| Variable | Definition | Interpretation |
|---|---|---|
| HR (beats per minute) |
Heart rate mean | Overall variability of cardiac activity |
| VLF (%) | Very low frequency | Slow recovery component of the HRV (vagal tone) |
| LF/HF ratio | Low frequency/high frequency ratio | Representation of the balance between the sympathetic and parasympathetic nervous systems |
