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AbstrAct | The spine is the main support and move-ment axis of the locomotor system, and numberless clini-cal conditions may require that this structure be submitted to functional restriction. Among the non-invasive treat-ments used in spinal or appendicular skeleton injuries, the immobilization of the spine is used as a rehabilitation strategy. Because of the functional restrictions generated by restraining devices used on the spine, the proposal of this study was to adapt a spinal orthosis on rats, thus mimicking the immobilization of corrective vests and as-sessing the energetic conditions of thoracic muscles after 12 weeks of application. Wistar rats that were 42 days old were used in this study (post-weaning period), followed-up for 12 weeks in 2 groups called control (C) and rectifica-tion vests (R), which were made of PVC to immobilize the spine. The following concentrations were evaluated: gly-cogen (GLY) of the paravertebral muscle and the thorax; total proteins and DNA (TP/DNA) and interleukin-6 (IL-6). The normality Kolmogorov-Smirnov test was used for sta-tistical analysis, followed by the Tukey test. A 5 % level was established for all of the calculations. It was observed that group R presented 12 % less body mass and GLY stores 21 % lower; the ratio between TP/DNA was in average 6.6% lower; IL-6 concentrations were in average 25 % higher. The study shows that the movement restriction in the spine leads to energetic crisis and compromised muscular de-velopment. More studies should be conducted with this model to generate physical therapy strategies that could reduce muscle compromise after spine immobilization