Key result
In patients with recent AMI, use of β-blockers was associated with a higher rating of perceived exertion at the ventilatory threshold and lower heart rate recovery.
Why the study?
Does beta-blocker therapy alter heart rate recovery and rating of perceived exertion in post-AMI patients undergoing cardiac rehabilitation?
Observational (n=105)
Does beta-blocker therapy alter heart rate recovery and rating of perceived exertion in post-AMI patients undergoing cardiac rehabilitation?
Beta-blocker use attenuates heart rate recovery and increases perceived exertion at the ventilatory threshold, highlighting the need to adjust exercise prescriptions in cardiac rehabilitation for patients on these medications.
Answers are grounded in this paper and cite their sources.
May require adjusted CPET interpretation in β-blocker-treated recent AMI; leaves open effects on outcomes and prescribing.
BACKGROUND: The influence of β-blockers on heart rate recovery (HRR) and rating of perceived exertion (RPE) during Phase I cardiac rehabilitation (CR) for patients with a recent episode of acute myocardial infarction (AMI) is not clear. METHODS: From October 2009 to July 2011, 105 patients with a recent episode of AMI who received a successful percutaneous coronary intervention were recruited into this study. Before entering Phase II CR, each patient underwent a cardiopulmonary exercise test (CPET), where RPE was assessed every minute and related parameters were recorded. RESULTS: The participants entering CR had relatively low mean peak oxygen consumption (VO2max). However, the peak heart rate and VO2max were lower in those taking β-blockers. The RPE value at the ventilatory threshold (VT) was significantly higher (12.7 ± 1.7) in participants who were taking β-blockers relative to those who were not (11.5 ± 1.4). The HRR value was lower (12.5 ± 8.8) in participants who were taking β-blockers relative to those who were not (17.0 ± 9.1). CONCLUSION: These findings suggest that use of β-blockers increased the RPE value at the VT. In addition, HRR was attenuated by β-blockers. In patients who do not undergo CPET, the use of β-blockers should be taken into consideration when using RPE for the initial exercise prescription to determine training intensity.
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Tsai et al. (2015) conducted an observational in Acute myocardial infarction (AMI) (n=105). β-blockers vs. No β-blockers was evaluated on Rating of perceived exertion (RPE) at the ventilatory threshold (VT). In patients with recent AMI, use of β-blockers was associated with a higher rating of perceived exertion at the ventilatory threshold and lower heart rate recovery.
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