Viscoelastic and Viscoplastic Glucose Theory (VGT #19): Applying Theories of Viscoelasticity and Viscoplasticity from Engineering and Energy Theory from Physics for Three PPG Cases to Compare the Energy Loss in Loading-Unloading Process via Three Hysteresis Loop Areas Along with Comparing Three PPG Associated Energies via Time-Domain and Frequency-Domain Based on the GH-Method: Math-Physical Medicine (No. 598)