In a stress test for elite athletes a physical system is used to measure the performance of the individual, Indicate which of these signals are analog signals: Heart rate Type: Numeric; Range: Integers from 35 to 300 ECG (Electrocardiogram) - Type: Voltage: Range: (0.5-4 mv). Activity level (accelerometer) = Type: Current, Range: [0-7 mA) O Weight - Type: Weight: Range: [25-100 kg) O voz - Type: Liters / minute: Range: [2-7.51/ min). O Respiratory Rate Type: Numerical; Range: integers from 8 to 40.