Efeitos do ultra-som na migração das células satélites após uma lesão experimental em ratos

Therapeutic ultrasound is commonly used in muscle lesions. A lot of investigations are carried out to verify its effects during the phases of regeneration of the skeletal muscle tissue. The porpose of this study was to analyse different approaches found on the effects of the ultrasound on migration of satellites cells to the injury site. Were used male adults rats, of the Wistar lineage (obtained at the laboratory of FFFCMPA), randomly distributed in five groups, where the gastrocnemius muscle in both inferior members were injured with experimental contusion. The right side received treatment with ultrasound, while the left side was the control group. The frequency used was 3 mHz, pulsed to 20%, intensity of 1w/cm for 4 minutes, for two days in the group I, 4 in the group II, 6 in the group III, 13 in the group IV and 20 in the group V, each group was sacrificed on the 3, 5, 7, 14 and 21 days, respectively. There was prevalence of satellites cells in the treated member on 18 mouses (54,54%) (p < 0,05). We can conclude that, even with increase of proliferation of satellites cells, we cannot affirm that the alteration was provoked only by the effect of the ultrasound. Further studies are required in this area. Key-words: ultrasound, cicatrisation. Recebido 16 de março de 2004; corrigido 13 de dezembro; aceito 15 de dezembro de 2004. Endereço para correspondência: Adriana Moré Pacheco, Rua Comendador Rheingantz, 362/601 B, Auxiliadora 90450-020 Porto Alegre RS, E-mail: adrimpacheco@terra.com.br 11 Fisioterapia Brasil Volume 6 Número 1 janeiro/fevereiro de 2005