The purpose of this study is to describe biological stress (cortisolemia) and perceived stress in Emergency Call Center Operators and Doctors while processing a center 15 call.

Sample description : qualitative variables be expressed as percentages, numbers and 95% confidence intervals Quantitative variables will be expressed as means, standard deviations or medians, range, interquartile intervals Description of biological stress : it will be described by calculating the difference between the observed peek or peeks of cortisol ans the cortisol level measured at rest (means, standard deviations or medians, range, interquartile intervals) Description of perceived stress : the AVS will be described in terms of means and standard deviation Comparison of the peek-delta/base level of cortisol in the 3 different workstations of the call center operators according to the non parametrical Kruskall Wallis test. Same for the lengthof service of the call operator, the severity of the call and the status of the doctor The AVS score (perceived stress) will be compared to the peek-delta/base level of cortisol (biological stress) thanks to the Spearmann correlation coefficient.

Inclusion Criteria:

• medical and paramedical staff from the center 15 (call operators, emergency doctors and general practitioners)
• healthy volunteers having received the specific information letter regarding the sudy and having signed the clarified consent form
• healthy volunteers are affiliated to the french social welfare

Exclusion Criteria:

• chronic alcoholism
• women under oestroprogestative hormonal treatment
• high level athletes
• healthy volunteers under steroids treatment
• healthy volunteers suffering from a mental health related disorder
• fever on the day the sample is taken
• healthy volunteers with endocrine disorders