The goal of this Prospective, monocentric, non-randomized, open-label study aimed at evaluating the variation of FEV1 during a state of self-induced cognitive trance participant population: Person with expertise in the practice of TCAI can be inclued. (at least 6 months, in order to be able to control the depth of the trance and to have a motor control allowing the realization of a spirometry)

The main question:

Study the significant variation of FEV1 before, during, or after the state of self-induced cognitive trance

Primary objective : Study the significant variation of FEV1 before, during, or after the state of self-induced cognitive trance judgment criteria:

Significant variations in:

PEF PEF25 PEF50 PEF75 FVC Inspiratory capacity, SpO2 Respiratory rate before, during, or after the self-induced cognitive trance state Evolution of the feeling of self-efficacy, assessed by questionnaire

Inclusion Criteria:

• Person over 18 years old
• Person with expertise in the practice of TCAI. (at least 6 months, in order to be able to control the depth of the trance and to have a motor control allowing the realization of a spirometry)
• Person affiliated with social security or beneficiary of such a scheme.
• Person having given, in writing, their free and informed consent to participate in the study

Exclusion Criteria:

• Person deprived of liberty by judicial or administrative decision, person subject to a measure of legal protection.
• Exclusion period for other studies
• Person likely, according to the investigator's assessment, not to be cooperative or respectful of the obligations inherent in participation in the study
• Person with a psychiatric, neurological or cardiovascular disease.
• Person with a chronic respiratory disease, for example: asthma, COPD, interstitial lung disease, bronchial dilation, cystic fibrosis,
• Person with a history of exercise-induced bronchospasm.
• Person taking inhaled treatments (corticotherapy, bronchodilators, anticholinergics)
• Pregnant woman (declarative).

Person with expertise in the practice of TCAI. (at least 6 months, in order to be able to control the depth of the trance and to have a motor control allowing the realization of a spirometry)