None listed
Conditions
Brief summary
The aim of this study is to evaluate the validity, reliability and sensitivity of predicting VO2max from a perceptually-regulated exercise test (PRET) and to evaluate the efficacy of regulated exercise intensity during cardiac rehabilitation using perceived exertion. Specifically, the study will assess how perceptions of effort change over a 6-week exercise program and will quantify these changes in relation to physiological (i.e. heart rate and VO2) and performance (i.e. work rate) indicators of exercise intensity. Participants referred for cardiac rehabilitation, following myocardial infarction or cardiac surgery, will complete a symptom-limited exercise test to establish VO2max and 3 PRETs. Participants will then be randomised to a supervised exercise or wait-list control. Supervised exercise will consist of 6-weeks of exercise training for 1 hour 2x per week. Exercise intensity will be regulated at RPE 13 on Borg’s 6-20 RPE scale. Heart rate will be measures in each session and oxygen uptake objectively measured during the first and last week. Participants will then repeat the symptom-limited exercise test and 3 PRETs.
Interventions
Participants randomised to the intervention group will complete a 6-week supervised exercise-based rehabilitation program. Exercise sessions will occur twice per week for one hour, conducted in a rehabilitation gym, and supervised by an Accredited Exercise Physiologist (5+ years experience). Sessions will be provided in small groups of a maximum of 6 participants per group. Exercise training will comprise a 10min warm-up, followed by 30min training at an intensity of RPE 13 on Borg's 6-20 Ratin
Participants randomised to the intervention group will complete a 6-week supervised exercise-based rehabilitation program. Exercise sessions will occur twice per week for one hour, conducted in a rehabilitation gym, and supervised by an Accredited Exercise Physiologist (5+ years experience). Sessions will be provided in small groups of a maximum of 6 participants per group. Exercise training will comprise a 10min warm-up, followed by 30min training at an intensity of RPE 13 on Borg's 6-20 Ratings of Perceived Exertion (RPE) scale. This will be followed by 5min cool-down, totaling 45min of exercise with 30min at the prescribed training intensity. All exercise will be performed on a motorised treadmill. Adherence with attendance to exercise sessions will be monitored and patients must complete at least 10 exercise sessions (i.e. >80% of sessions) to be included in final analyses. If a patient misses two or more sessions in a row, another week will be added to their program to account for the missing sessions. Adherence with exercise intensity will be monitored by a) by confirming the exercising RPE every 5min during training and b) exercising heart rate will be recorded during every session and compared to the heart rate values corresponding to RPE 13 during the initial exercise testing.
Sponsors
University of South Australia
Study design
Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Treatment
Masking
Open (masking not used)
Eligibility
Sex/Gender
All
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
Eligible patients will have had: Acute myocardial infarction (within last 4-16 weeks), Percutaneous coronary intervention (within last 4-16 weeks), and/or Coronary artery bypass surgery (within last 8-16 weeks). Patients must be physically capable of undertaking moderate intensity exercise on a motorised treadmill
Exclusion criteria
1) Symptoms of angina present at rest or during submaximal (light) intensity exercise. 2) Unstable angina, myocarditis or symptomatic heart failure (defined as NYHA class III or IV, or LVEF < 40%) 3) Uncontrolled dysrhythmia or high degree atrioventricular block 4) Severe arterial hypertension (defined as >200/100mmHg after 10min seated rest) 5) Sternal instability, severe musculoskeletal deconditioning or any other complications in surgical recovery 6) uncontrolled metabolic disease 7) Pregnant 8) low English proficiency or unable to give informed consent.
Outcome results
None listed