Exercise Support and Rehabilitation for Patients After Spontaneous Coronary Artery Dissection

Rate of successful recruitment

Rate of successful adherence

Acceptability of the intervention assessed via qualitative interviews which will be then transcribed verbatim. Acceptability will be assessed via thematic analysis of semi-structured interviews. Once patients completed T3 (+/- 7 days), they will be invited to take part in semi-structured interviews.

Changes in exercise duration expressed in time (hours: minutes) measured by the activity monitor(s) over the study period.

Changes in exercise intensity expressed in period(s) of time spent (hours: minutes) performing light, moderate, and/or heavy intensity exercise.

Self-reported self-efficacy levels via the self-efficacy questionnaire. This questionnaire uses a 10-item Likert scale, where minimum score is 1 (not at all true) and the maximum score is 4 (exactly true). The overall score range therefore is 10-40 where higher scores indicate better self-efficacy.

Self-reported chest pain via the Seattle Angina Questionnaire-7 (SAQ-7) uses a four week recall period therefore the scores can be translated into frequency of angina symptoms 0-30=daily angina, 31-60=weekly angina, 61-99=monthly angina and 100=no angina). The summary score range from 0 to 100 with higher scores indicating less angina and overall better quality of life.

Self-reported wellbeing via the Warwick Edinburgh Mental Wellbeing Scale (WEMWBS). This is a 14-item Likert scale questionnaire with 5 response categories (1=None of the time to 5=All of the time). The total score can range from 14-70, where higher scores indicate better wellbeing.

Self-reported general anxiety levels will be assessed via the Generalised Anxiety Disorder questionnaire (GAD-7). The GAD-7 scores each item in a Likert-scale fashion, where 'Not at all' is scored as '0', 'Several days in scored as '1' , 'More than half the days' is scored as '2' and 'Nearly every day' is scored as '3'. Higher values indicate more severe anxiety (where maximum score is 21). The data then can be categorised into the following:

Score 0-4: Minimal Anxiety Score 5-9: Mild Anxiety Score 10-14: Moderate Anxiety Score greater than 15: Severe Anxiety.

Self-reported cardiac related questionnaire, which assesses cardiac anxiety via 18 items in a Likert-scale fashion. Items are scored from 0-4 where 'Never' is scored as '0', 'Rarely' is scored as '1' , 'Sometimes' is scored as '2' , 'Often' is scored as '3' and 'Always' is scored as '4'. Higher scores indicate more severe anxiety where the minimum score is 0 and the maximum is 72.

Age expressed in years

Sex assigned at birth expressed as: Female, Male or Prefer not to answer.

Categorical self-reported data defined as the following:

• White
• Gypsy or Irish Traveller
• White and Black Caribbean
• White and Black African
• White and Asian
• Indian
• Pakistani
• Bangladeshi
• Chinese
• African
• Caribbean
• Arab
• Any other ethnic group (please describe)
• Prefer not to answer.

Self-reported numbers of Spontaneous Coronary Dissection (SCAD) events.

Self-reported smoking status defined as 'Current smoker', 'Previous smoker' and/or 'Never smoked'

Self-reported measure of momentary physical activity levels. Participants are asked to recall habitual physical activity levels (of all intensities such as vigorous, moderate activities and walking) from the past 7 days. Participants are requested to quantify time spent performing these activities in days, hours and minutes. Participants are also asked to report on sedentary time. A finals scores is then calculated and expressed in the metabolic equivalent of task (MET) minutes per week (MET/min/week).

Self-reported distance achieved in the 6-minute walk test administered using the Timed Walk App. Participants are requested the distance (in metres) they walked over 6 minutes.

Participants are requested to report the number of repetitions (count data) of sit to stands over half a minute (30 seconds).