In a psychological experiment, the potentially causal factor that is manipulated by the investigator is called the variable while the factor that may be influenced by the manipulated experimental treatment is called the variable

The experimental factor that is manipulated by an investigator is called the independent variable, while the factor that may be manipulated by the influenced experimental treatment is called dependent factor. Experimental factors are general type or category of treatments. Different treatments constitute different levels of a factor.

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath.