Table 2 Overview of the assesments used

Psychological assessment

Regensburg COVID documentation (ReCoRD)

Primary COVID-19 symptoms, current post-COVID symptoms (25 frequently reported complaints of different organ systems); relevant medical history

25

Work ability index (WAI)

Ilmarinen [14]

Demands of the job, health status, resources of the worker

7

Personal health questionnaire (PHQ)

Spitzer et al. [15]

Depressive, anxiety,somatoform disorders, psychosocial functionality, stressors, critical life events

78

Dissability assessment (WHO-DAS 2.0)

Üstün et al. [16]

Cognition (understanding & communicating), Mobility (moving & getting around), Self-care (hygiene, dressing, eating & staying alone), Getting along (interacting with other people), Life activities (domestic responsibilities, leisure, work & school) and Participation (joining in community activities)

36

Life skills (LK-18). Hinterberger, Walter and Galuska [17]

Well-being, self-regulation, commitment, sense of purpose, self-efficacy and social contacts

18

Fatigue scale for motor functioning and cognition (FSMC)

Penner et al. [18]

Subjectively experienced fatigue symptoms, graduation of cognitive and motor fatigue

20

Avoidance-endurance questionnaire (AEQ). Hasenbring et al. [19]

(alternatively: Avoidance-Endurance Questionnaire, short Version (AE-FS).)

Fear-avoidance responses and endurance-related responses (cheerful-suppressive way and a distress-endurance way)

49

Neurological assessment

Montreal cognitive assessment (MoCA). Nasreddine et al. [20]

Various cognitive abilities such as memory, language, contextual thinking, attention and concentration, behaviour, arithmetic, temporal and spatial orientation and the ability to recognise complex shapes and patterns

30

Test battery for attention (TAP)

Scherwath et al. [21]

Intensity of attention, Executive functions, control of the focus of attention, Attentional selectivity, focused attention, visuo-spatial attention

45 min

Somatic assessment

Six-Minute walk test (6MWT)

Enright [22]

Assess and control cardiovascular and pulmonary performance below the anaerobic threshold

Spiroergometry

Kroidl et al. [23]

Function of the heart, circulation, respiration and muscle metabolism in a relaxed state and under increasing physical stress up to maximum load

Pulmonary function test

[24, 25]

Functional and performance capacity of the lungs and bronchial tubes; monitoring the course and therapeutic success of lung diseases

Blood gas analysis and laboratory (blood test)

Haber [26], Boemke et al. [27]

Blood test that measures how much carbon dioxide and oxygen are in the blood; conclusions can be drawn about the health of the heart and lungs

Caridac echo

Picard and Weiner [28] Carmeli et al. [29]

Information about the structure of the heart (e.g. size of the heart chambers, function of the heart valves, thickness of the heart muscle)

24-h ECG

Mehraeen et al. [30], Ståhlberg et al. [31]

Information about how the heart functions under everyday conditions

Post-exercise malaise/adverse events monitoring

Structured recording of adverse event/fatigue

Fatigue level, post-exercise malaise / adverse events