The aim of this study consisted in evaluating the influence of low power laser on the morfometry of white adipose cells
in rats. The sample consisted of 20 adult female rats, from Wistar strain, randomized in four groups. All groups were
submitted to tricotomy of the dorsal thoracic area and the first three groups were exposed to a InGaAlP laser (660 nm
wavelength) with fluencies of 2, 8 and 16 J/cm<sup>2</sup> for groups L1, L2 and L3, respectively. L4 was the control. The groups
were submitted to the protocols three times a week, for three weeks. The irradiated tissue was excised and submitted to
histological treatment by HE for optical microscopy and the Kruskal-Wallis test was used for the statistical analysis. The
average morphometry, in number of pixels, was: 3741 ± 704, 3762 ±947, 3737 ±1076 and 4619 ±781 for L1, L2, L3 and L4, respectively. There was no significant difference among groups L1 to L3 for the variable tested. From these results, it can be concluded that the application of low power laser - under the conditions proposed and for the fluency values chosen - influence the morphometry of white adipose cells in rats in the same manner, producing similar results.