The stress index reflects the degree of stress on the body.

    Stress is a response of the human body to an overstrain, negative emotions, or simply to monotonous bustle.

    During stress, the human body produces the hormone adrenaline, which makes you look for a way out. Stress in small quantities is needed by everyone, as it makes you think, to seek a way out of the problem.

    But severe stress affects health. Immunity decreases and a number of diseases develop (cardiovascular, gastrointestinal, etc.).

    It reflects the degree of centralization of heart rhythm control and characterizes the activity of the sympathetic department of the autonomic nervous system (the degree to which the activity of central regulation mechanisms prevails over autonomous ones).