The Effectiveness of Progressive Aerobic Interval Training in Cardiac Rehabilitation

AbstractIntroductionAerobic interval training (AIT) has recently emerged as a more effective strategy than moderate intensity continuous exercise (MICE) for improving VO2peak in CAD patients. The primary purpose of this retrospective study was to describe the change in VO2peak, and CV risk profile characteristics (secondary outcomes) after progressive AIT practiced in the largest, outpatient cardiac rehabilitation (CR) program in North America compared to usual care CR involving MICE.MethodsElectronic database records were retrieved from consecutively enrolled patients with CAD who attended the Toronto Rehabilitation Institute, between January 1, 2005 to December 31, 2015. Patients were then separated into two, age and sex propensity score matched groups: 772 patients were prescribed 26 weeks of MICE (60-80% of VO2peak, 5 times/week) as per usual care CR (56.0±9.2 years; 12% female/88% male; VO2peak: 20.8±5.9 ml⋅kg-1⋅min-1), and 772 patients were prescribed 26 weeks of progressive walk/jog intervals (15min/mile walking pace, 12min/mile jogging pace, 5 times/week) (55.9±9.3 years; 12% female/88% male; VO2peak: 24.8±5.7 ml⋅kg-1 ⋅min-1). Treatment effect analysis of AIT on VO2peak and CV risk profile characteristics was performed using multiple regression with baseline values as covariates.ResultsTreatment effect analysis revealed a 3.84 ml⋅kg-1⋅min-1 superior improvement in VO2peak in the AIT group compared to usual care MICE group (p

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