Introduction: The weakness acquired in the UCI is a condition that appears often in the critical patient, causing deficiencies in their physical and functional state. The early mobilization has proved to be safe and feasible demonstrating an improvement in the muscular strength and functionality of the patient during his stay in the ICU. Objectives: To describe the benefit of early mobilization in relation to muscle strength and functionality of critical patients upon discharge from the ICU. Material and methods: A retrospective, observational and descriptive study was conducted in the period from June to December of 2017, with a convenience sample of patients admitted to the ICU who were under mechanical ventilation and sedation, registration was obtained in the clinical files of muscle strength, functionality and mobility after the withdrawal of sedation and previous discharge of the patient, and the changes found were recorded. Results: A sample of 8 patients was obtained, of which 25% of the patients met the criterion of weakness acquired in the ICU, in the IB it was observed that 100% of the patients obtained a severe dependency with a score between 21 -60 points and the IMS showed that 100% of the patients performed mobilization out of bed with or without assistance. A statistically significant difference was obtained with the Wilcoxon test: MRC (p = 0.012) and IB (p = 0.012). Conclusion: An early mobilization intervention favors the partial recovery of the complications of the stay in the ICU.