The thermostimulated creep of three amorphous polyolefins having the repeating unit ─(CH2)mC(CH3)(C2H5)─, where m = 1, 2, and 3, was investigated from 77° K to 350° K. A broad relaxation process is observed around the glass transition temperature in each polyolefin. The corresponding TSC peaks have been resolved into elementary components with a relaxation time τ obeying a compensation law τ = τcexp {(ΔH/k)[1/T) —(1/Tc)], where Tcand Tcare characteristic of the polyolefin. From the TSC data, we have calculated, the mechanical loss peaks associated with the glass transition and we have compared them with the dielectric loss peaks.