| RSA | Respiratory sinus arrhythmia |
| RR | inter-beat interval series |
| dRR | Absolute difference inter-beat interval series |
| ANS | Autonomic nervous system |
| NASA-TLX | NASA task load index |
| SWAT | Subjective workload assessment technique |
| ECG | Electrocardiogram |
| MSE | Multi-scale entropy |
| PE | Permutation entropy |
| mPE | Modified permutation entropy |
| HRV | Heart rate variability |
| MATB | Multi-attribute task battery |
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