Types | Indirect mode | Specific mode |
---|---|---|
subjective measure | Subjective assessment scale | NASA-TLX, WP scales, etc |
Task performance | Dual task measurement | |
objective measurement | Physiological measurement data | Electrocardiogram, oculomotor, electroencephalogram, etc |
Name | unit | illustrate | Formula |
---|---|---|---|
ms | Mean RR interval | ||
ms | Normal RR interval standard deviation | ||
ms | Root mean square of RR interval difference between neighbors | ||
% | proportion of RR interval difference greater than 50ms |
Name | Abbreviation | Meaning | Frequency range |
---|---|---|---|
Very low frequency | - | <0.04 Hz | |
low frequency | Reflecting sympatheti c nervous activity | 0.04 ~ 0.15 Hz | |
High frequency | Reflecting parasympat hetic nerve activity | 0.15 ~ 0.4 Hz |
Name | Value range |
---|---|
resolution ratio ECG | ≥ 16Bit |
measurement range | -1500 |
Adjustable magnification | 1,2,3,4,5,6,7 |
accuracy | 0.183 |
Number of wireless sensor channels | ≥1 |
Wireless transmission frequency | 2.4GHz |
Distance | 10m ~ 100m |
Battery operating time | ≥ 4h |