Background: In the United Kingdom (UK), exercise intensity is prescribed from a fixed percentage range (% heart rate reserve; %HRR) in cardiac rehabilitation (CR) programmes. We aimed to determine the accuracy of this approach by comparing it
with an objective, threshold-based approach incorporating the accurate determination of ventilatory anaerobic threshold (VAT). We also aimed to investigate the role of baseline cardiorespiratory fitness status, and exercise testing mode dependency (cycle
v treadmill ergometer) on these relationships.
Design/Methods: A maximal cardiopulmonary exercise test was conducted on a cycle ergometer or a treadmill before and following usual-care circuit training from two separate CR programmes from a single region in the UK. The heart rate corresponding to VAT was compared to current heart rate-based exercise prescription guidelines.
Results: We included 112 referred patients (61 years [59-63]; body mass index 29 kg∙m-2 [29-30]; 88% male). There was a significant but relatively weak correlation (r=0.32; P=0.001) between measured and predicted %HRR, and values were significantly different from each other (P=0.005). Within this cohort, we found that 54% of patients had their VAT identified outside of the 40-70% predicted HRR exercise training zone. In the majority of participants (45%), the VAT occurred at an exercise intensity
Pymer, S., Nichols, S., Prosser, J., Birkett, S., Carroll, S., & Ingle, L. (in press). Does exercise prescription based on estimated heart rate training zones exceed the ventilatory anaerobic threshold in patients with coronary heart disease undergoing usual-care cardiovascular rehabilitation? : a United Kingdom perspective. European Journal of Preventive Cardiology, https://doi.org/10.1177/2047487319852711