Use this control to adjust the weight of the patient, either by retyping the number of kilograms in the display or by pressing the up/down spin buttons on the right. The patient compartment volumes (body mass) will increase or decrease linearly and the metabollic rates will increase or decrease allometrically to match. This control will be disabled except at the start of the simulation. (Gas Man® assumes that the patient does not change size during a simulation.)

Although you can change the patient weight at the beginning of any simulation, making changes while replaying a simulation will invalidate all subsequent recorded results and adjustments. For example, rewinding a simulation (or opening a saved simulation) and adjusting patient weight would erase it from the revision point forward. (This will not affect the saved version.) Gas Man® will ask you to confirm your intent whenever you modify a simulation during replay.