Introduction: a descriptive, cross-sectional study in order to identify ergonomic risks related motor-sensory median nerve at the wrist, 58 janitors public schools that met the inclusion criteria alterations. Methods: method Job Strain Index, physiotherapy assessment of hand and instrument of job description: data collection instruments as were used. Results: most people belong to the female, aged between 51 and 60 years, who have been working in this office for more than 10 years, presenting with symptoms of pain most often between 69% - 53.4%; paresthesias 58.6% - 44.8%; weakness 41.4% - 36.2% for both the dominant and non-dominant hand, the activity represents increased risk is mopping the floor as clean. Conclusions: the study allowed themselves evidence of the variables sustained postures and repetitive movements where to apply statistical analysis allowed evidence that the dominant hand is the most affected area characteristics. The existence of outside activities implies that in one way or another indirectly influence on the evaluation and diagnosis of a sensory impairment -motora.