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High-Intensity Interval and Continuous Training for Heart Transplant Patients and Its Impact on Heart Rate Recovery
Session:
SESSÃO DE POSTERS 25 - ALÉM DA RECUPERAÇÃO - AVANÇANDO AS FRONTEIRAS DA REABILITAÇÃO CARDÍACA
Speaker:
Ana Raquel Carvalho Santos
Congress:
CPC 2025
Topic:
J. Preventive Cardiology
Theme:
29. Rehabilitation and Sports Cardiology
Subtheme:
29.2 Cardiovascular Rehabilitation
Session Type:
Cartazes
FP Number:
---
Authors:
Ana Raquel Carvalho Santos; Ricardo Carvalheiro; Vânia M. G. Martins; Francisco Gregório; Miguel Trindade; Ana Rita Caramelo; Jorge Dias; Rita Ilhão Moreira; António Gonçalves; Joana Pinto; Pedro Rio; Rui Ferreira
Abstract
<p style="text-align:justify"><span style="font-size:11pt"><span style="font-family:Aptos,sans-serif">Heart rate recovery (HRR) during cardiopulmonary exercise testing (CPET) is a critical marker of autonomic function and cardiorespiratory fitness. Understanding its role in predicting functional gains during cardiac rehabilitation (CR) and the influence of training modalities, such as high-intensity interval training (HIIT) versus continuous training (CT), can optimize rehabilitation outcomes, particularly in heart transplant recipients.</span></span></p> <p style="text-align:justify"><span style="font-size:11pt"><span style="font-family:Aptos,sans-serif">Methods: We retrospectively analyzed data from heart transplant recipients undergoing a structured CR program. HR metrics (baseline HR, maximum HR, and first-minute HR recovery during CPET) were assessed pre- and post-rehabilitation. Fitness improvements were evaluated using changes in 6-minute walk test (6MWT) distance and VO2 max. Correlations between HRR and fitness improvements were calculated for the overall cohort and stratified by training modality (HIIT vs. CT).</span></span></p> <p style="text-align:justify"><span style="font-size:11pt"><span style="font-family:Aptos,sans-serif">Results: A total of 15 patients (HIIT: 5, CT: 10) were included. In the HIIT group, HRR metrics demonstrated strong correlations with fitness improvements. Maximum HRR was perfectly correlated with 6MWT distance improvement (r=1.00) and had a strong positive correlation with VO2 max improvement (r=0.83). Baseline HRR was inversely correlated with VO2 max improvement (r=-0.98), indicating that patients with poorer baseline autonomic function derived greater benefits. In contrast, the CT group exhibited weaker correlations. Maximum HRR was moderately associated with VO2 max improvement (r=0.48), while baseline HRR showed a negative correlation with 6MWT improvement (r=-0.58).</span></span></p> <p style="text-align:justify"><span style="font-size:11pt"><span style="font-family:Aptos,sans-serif">Conclusion: In heart transplant recipients, HIIT demonstrated stronger associations between HRR metrics and fitness improvements compared to CT, underscoring its effectiveness in enhancing autonomic recovery and functional capacity in this unique population. Transplant recipients with impaired baseline autonomic function benefited the most, particularly from HIIT, as reflected by improvements in VO2 max and 6MWT distance. HRR metrics, are valuable predictors of fitness improvements and should be routinely monitored in cardiac rehabilitation programs tailored for heart transplant patients.</span></span></p>
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