Richardson 2014.

Study characteristics
Methods	Study design: single‐blinded randomised control trial Number of participants: 23 people were randomised Exclusions post‐randomisation: 0 Losses to follow‐up: abstract stated that 23 people were enrolled, but clinical trial registry posted after trial was complete stated that 21 people were enrolled Intention‐to‐treat analysis: NR Duration/dates study conducted: September 2011 to May 2015
Participants	Country: UK Setting: Medway Maritime Hospital Age: NR Sex: NR Inclusion criteria: people aged > 18 years; able to give informed consent; able to comply with the study protocol; undergoing open surgical repair for an asymptomatic perirenal and infrarenal abdominal aortic aneurysm. Exclusion criteria: people with severe disabling disorders limiting mobility, e.g. severe osteoarthritis; people undergoing thoracoabdominal aneurysm surgery; people physically unable or unwilling to undertake maximal cardiopulmonary exercise testing and the other fitness tests; people younger than 18 years of age or older than 80 years of age
Interventions	Intervention group (and sample size): number of participants not reported. Usual care plus preoperative exercise. Cycled for 60 min at 60% VO2 peak (submaximal cycling exercise at a moderate exercise intensity) on three consecutive days immediately prior to surgery. During the 60 min of exercise, participants were provided with three equally spaced 3 min rest periods. The last exercise session was completed no more than 48 h prior to the operation. Control group (and sample size): usual care; number of participants not reported
Outcomes	Postoperative mortality (60‐day mortality); length of hospital stay (through study completion, on average up to 60 days postsurgery); postoperative complications as assessed by the POMS (on average up to 5 days postsurgery) ‐ pulmonary, infectious, renal, gastrointestinal, cardiovascular, neurological, wound, haematological and pain.
Notes	Funding source and declaration of interests not recorded.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not reported
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Care providers blinded. Due to nature of intervention, participants could not be blinded.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not reported
Incomplete outcome data (attrition bias) All outcomes	High risk	Abstract stated that 23 people were enrolled, but the clinical trial registry posted after the trial was complete stated that 21 people were enrolled. No information on the numbers of participants in each study arm.
Selective reporting (reporting bias)	Unclear risk	Trial protocol was registered on clinicaltrials.gov after the study was completed.
Other bias	Low risk	No evidence of other bias.