Final answer:
EDA measures skin conductance, while HRV is derived from an ECG and measures the variance in time between heartbeats. Neither directly measures blood pressure, respiratory rate, or body temperature.
Step-by-step explanation:
Electrodermal activity (EDA) and Heart Rate Variability (HRV) are measures used to track physiological responses. EDA refers to the variation in the electrical properties of the skin in response to sweat production, effectively measuring skin conductance. HRV, on the other hand, reflects the variance in time between each heartbeat, which is derived from an electrocardiogram (ECG), a recording of the electrical impulses of the cardiac muscle. Neither EDA nor HRV directly measures blood pressure, respiratory rate, or body temperature.
These are different physiological parameters that are measured using separate methods. An ECG can provide crucial information regarding heart muscle function and is also used to estimate heart rate in beats per minute.