It is shown that modulation of subcutaneous white adipose tissue (sWAT) volume after application of different physical factors in body contouring procedures cannot be characterized by a single physiological reaction with dispersed reaction times, supposing that several different dynamic processes with different characteristic reaction times must be involved. Quick modulation of sWAT with characteristic times of 10³ - 10⁵ s must be connected with such processes as hyaluronan production and consequent water retention in the tissue, as well as with reversible modulation of its mechanical properties. It is supposed that slow processes with characteristic times of up to 3 × 10⁶ s can be caused by modulation of lipolytic activity of adipocytes through changesin their micro-environment or through their transdifferentiation, as well as through death and removal of adipocytes from sWAT.