| Cardiac parameters (unit) | Definition |
|---|---|
| BHR (bpm) | Basal heart rate measured before 5 s of plastic-bag introduction. |
| MHR (bpm) | Maximum heart rate during the novel object test. |
| Time to MHR (s) | Delay to reach maximum heart rate from the beginning of the test. |
| SDNN (ms) | Standard deviation of the beat-to-beat intervals. |
| RMSSD (ms) | Square root of the mean squared differences of successive beat-to-beat intervals. |
| LF/HF | Ratio of low frequency (LF) to high frequency (HF) components of a continuous series of beats (power spectrum). |