Conclusions Exercise-based cardiac rehabilitation is effective at reducing important clinical outcomes in patients with coronary heart disease .
While our analysis was constrained by the quality of included trials and missing information about intervention components , there appears to be little differential effect of variations in exercise intervention , particularly on mortality outcomes .
Background While the clinical benefits of exercise-based cardiac rehabilitation are well established , there is extensive variation in the interventions used within these trials .
It is unknown whether variations in individual components of these exercise interventions provide different relative contributions to overall clinical outcomes .
This study aims to systematic ally examine the relationship between individual components of the exercise intervention in cardiac rehabilitation ( such as intensity and frequency ) and clinical outcomes for people with coronary heart disease .
High-intensity interval training may reduce in-stent restenosis following percutaneous coronary intervention with stent implantation A randomized controlled trial evaluating the relationship to endothelial function and inflammation.
BACKGROUND High-intensity interval training has been shown to be superior to moderate continuous exercise training in improving exercise capacity and endothelial function in patients with coronary artery disease . The objective of this study was to evaluate this training model on in-stent restenosis following percutaneous coronary intervention for stable or unstable angina . METHODS AND RESULTS We prospect ively r and omized 40 patients after percutaneous coronary intervention with implantation of a bare metal stent ( n = 30 ) or drug eluting stent ( n = 32 ) to a 6-month supervised high-intensity interval exercise training program  ( n = 20 ) or to a control group ( n = 20 ) . At six months , restenosis , measured as in-segment late luminal loss of the stented coronary area , was smaller in the training group 0.10 ( 0.52 ) mm compared to the control group 0.39 ( 0.38 ) mm ( P = .01 ) . Reduction of late luminal loss in the training group was consistent with both stent types . Peak oxygen uptake increased in the training and control group by 16.8 % and 7.8 % , respectively ( P < .01 ) . Flow-mediated dilation improved 5.2 % ( 7.6 ) in the training group and decreased -0.1 % ( 8.1 ) in the control group ( P = .01 ) . Levels of high-sensitivity C-reactive protein decreased by -0.4 ( 1.1 ) mg/L in the training group and increased by 0.1 ( 1.2 ) mg/L in the control group ( P = .03 for trend ) . CONCLUSIONS Regular high-intensity interval exercise training was associated with a significant reduction in late luminal loss in the stented coronary segment . This effect was associated with increased aerobic capacity , improved endothelium function , and attenuated inflammation
Conclusions Exercise-based cardiac rehabilitation is effective at reducing important clinical outcomes in patients with coronary heart disease .
While our analysis was constrained by the quality of included trials and missing information about intervention components , there appears to be little differential effect of variations in exercise intervention , particularly on mortality outcomes .
Background While the clinical benefits of exercise-based cardiac rehabilitation are well established , there is extensive variation in the interventions used within these trials .
It is unknown whether variations in individual components of these exercise interventions provide different relative contributions to overall clinical outcomes .
This study aims to systematic ally examine the relationship between individual components of the exercise intervention in cardiac rehabilitation ( such as intensity and frequency ) and clinical outcomes for people with coronary heart disease .