Exploration of Possible Reasons for the Discrepancy Between Expectation and Indication of Subjective Perceived Exertions

During the stay, a study visit is arranged with the patient after the 6-minute walk test has been performed. This consists of filling out the questionnaire and an interview, which lasts about 45-60 minutes. This is carried out by the investigator on at least 5 subjects. After each interview, a list of influencing factors is kept. If new aspects continue to appear in the 5th interview, the interviews are continued (up to a maximum of the 10th subject). If no new aspects appear in the interviews from number 6 onwards, the interviews are discontinued and no further patients are recruited. The conversations are recorded with an audio recording.

The focus group is carried out first in order to identify influencing variables that may be relevant for the interview (duration 60-90 minutes).