  A nonrelativistic decomposition for the quark energy by the ratio of the
dispersion of quark momentum squared and the effective quark mass is
investigated in the framework of the relativistic oscillator constituent quark
model as bound systems of three valence quarks. It is shown that relativistic
corrections are defined by dispersion of the squared absolute value of the
quark momentum. The variations of the quark mass and oscillator parameter are
studied in detail both in the spectrum and in the nucleon magnetic moments.
