[en] An investigation of the observational properties for RR Lyrae variables in the galactic globular cluster ω Centauri is reported. The results show that ω Centauri belongs to the Oosterhoff Group I, notwithstanding the large. Oo II-like value of the average of the periods of ab-type RR Lyrae. The helium content is derived fot this cluster from the analysis of the variables in the (A-log Tsub(e)) plane. It is shown that the helium abundance is very close to the value Y = 0.30, about 0.05 larger than the value derived for the 'norma' Oo I globular cluster M3. (orig.)