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Feasibility and Utility of Recumbent Ergometer-Based Cardiopulmonary Exercise Test in Phase 1 Cardiac Rehabilitation Following Cardiac Surgery
Yeon Mi Kim
,Bo Ryun Kim
,Ho Sung Son
,Sung Bom Pyun
,Jae Seung Jung
,Hee Jung Kim
Introduction: Recent guidelines have emphasized the importance of early mobilization and rehabilitation of patients following cardiac surgery. However, studies on the optimal targets and prescription methods for phase I cardiac rehabilitation (CR) are lacking.Purpose: This study aimed to evaluate the feasibility and utility of an early phase 1 submaximal cardiopulmonary exercise test (CPET) using a recumbent ergometer in patients who have undergone cardiac surgery. Methods: Twenty ambulatory patients who underwent cardiac surgery between December 2021 and February 2023 were referred to the CR department on the fifth postoperative day, and a CR program was initiated. The program was conducted five times a week, with hour-long sessions consisting of warm-up exercises, resistance training, aerobic exercises, and a cool-down period. A recumbent ergometer-based submaximal CPET was performed approximately nine days after the surgery, prior to discharge. Participants initiated the test at 0 W, and the workload was increased by 20 W after 2 minutes. During the test, researchers evaluated parameters including estimated peak values of oxygen consumption (VO2), metabolic equivalents of task, respiratory exchange ratio (RER), blood pressure, heart rate (HR), and rating of perceived exertion (RPE). The grip strength test, 6-minute walk test (6MWT), Korean Activity Scale/Index (KASI), EuroQol-5 dimension (EQ-5D), and short-form 36-item health survey (SF-36) values were also measured prior to discharge. Results: Twenty patients (75% male, average age 62.50 ± 1.99 years) underwent CPET at a median of 9.0 (8.0; 12.5) days postoperative. The average exercise duration of the CPET was 411.75 ± 168.25 seconds. During the test, their estimated peak VO2 was 12.32 ± 0.75 ml/kg/min (corresponding to 46.65 ± 2.08% of VO2 max). The estimated peak RER was 1.01 (0.98–1.12), and the estimated peak RPE was 15.00 ± 0.51. Furthermore, the estimated peak HR was 111.8 ± 3.76 beats/min (equivalent to 70.95 ± 2.09% of age-predicted maximal HR). After adjustment for age and sex, significant positive correlations were observed between the estimated peak VO2 and 6MWT, squat endurance test, KASI, EQ-5D, and the physical component summary (PCS) of the SF-36 questionnaire. The 6MWT, squat endurance test, KASI, and PCS of SF-36 showed a correlation coefficient (r) of 0.522 (p=0.026), 0.628 (p=0.005), 0.586 (p=0.011), and 0.546 (p=0.019), respectively. No significant cardiac events, such as ST elevation/depression or hemodynamic instability, were observed during the test.Conclusion: Our findings suggest that performing recumbent ergometer-based CPET during early phase 1 CR is safe and feasible. These results highlight the potential of recumbent ergometer-based CPET as a valuable tool for guiding the appropriate prescription of early CR programs following hospital discharge in patients undergoing cardiac surgery.
Introduction: Recent guidelines have emphasized the importance of early mobilization and rehabilitation of patients following cardiac surgery. However, studies on the optimal targets and prescription methods for phase I cardiac rehabilitation (CR) are lacking.Purpose: This study aimed to evaluate the feasibility and utility of an early phase 1 submaximal cardiopulmonary exercise test (CPET) using a recumbent ergometer in patients who have undergone cardiac surgery. Methods: Twenty ambulatory patients who underwent cardiac surgery between December 2021 and February 2023 were referred to the CR department on the fifth postoperative day, and a CR program was initiated. The program was conducted five times a week, with hour-long sessions consisting of warm-up exercises, resistance training, aerobic exercises, and a cool-down period. A recumbent ergometer-based submaximal CPET was performed approximately nine days after the surgery, prior to discharge. Participants initiated the test at 0 W, and the workload was increased by 20 W after 2 minutes. During the test, researchers evaluated parameters including estimated peak values of oxygen consumption (VO2), metabolic equivalents of task, respiratory exchange ratio (RER), blood pressure, heart rate (HR), and rating of perceived exertion (RPE). The grip strength test, 6-minute walk test (6MWT), Korean Activity Scale/Index (KASI), EuroQol-5 dimension (EQ-5D), and short-form 36-item health survey (SF-36) values were also measured prior to discharge. Results: Twenty patients (75% male, average age 62.50 ± 1.99 years) underwent CPET at a median of 9.0 (8.0; 12.5) days postoperative. The average exercise duration of the CPET was 411.75 ± 168.25 seconds. During the test, their estimated peak VO2 was 12.32 ± 0.75 ml/kg/min (corresponding to 46.65 ± 2.08% of VO2 max). The estimated peak RER was 1.01 (0.98–1.12), and the estimated peak RPE was 15.00 ± 0.51. Furthermore, the estimated peak HR was 111.8 ± 3.76 beats/min (equivalent to 70.95 ± 2.09% of age-predicted maximal HR). After adjustment for age and sex, significant positive correlations were observed between the estimated peak VO2 and 6MWT, squat endurance test, KASI, EQ-5D, and the physical component summary (PCS) of the SF-36 questionnaire. The 6MWT, squat endurance test, KASI, and PCS of SF-36 showed a correlation coefficient (r) of 0.522 (p=0.026), 0.628 (p=0.005), 0.586 (p=0.011), and 0.546 (p=0.019), respectively. No significant cardiac events, such as ST elevation/depression or hemodynamic instability, were observed during the test.Conclusion: Our findings suggest that performing recumbent ergometer-based CPET during early phase 1 CR is safe and feasible. These results highlight the potential of recumbent ergometer-based CPET as a valuable tool for guiding the appropriate prescription of early CR programs following hospital discharge in patients undergoing cardiac surgery.
Posted: 22 January 2026
Differential Expression of Human and Bacterial Proteins Re- 2 veals Microbiome–Host Crosstalk in Metabolic Disorders
Carlos Vinicius Ferreira Da Silva
,Carlos José Ferreira da Silva
,Fernanda da Silva Marinho
,Youssef Bacila Sade
,Sandra Mara Naressi Scapin
,Fabiano L. Thompson
,Cristiane Thompson
,Eidy de Oliveira Santos
Posted: 22 January 2026
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Antonella Chesca
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Integrative Transcriptomic, Proteomic and Epigenetic Analysis Uncovers Reproductive Dysregulation in F1 Males of Solea senegalensis
Marco Anaya-Romero
,Alberto Arias-Pérez
,Daniel Ramirez
,María Esther Rodríguez
,Manuel Alejandro Merlo
,Silvia Portela-Bens
,Ismael Cross
,Diego Robledo
,Laureana Rebordinos
Posted: 22 January 2026
From Polycausal Disease to “Paint-and-Go”: Evidence-to-Policy Drift in Early Childhood Caries, SDF “Magic Paint,” and the Risks of Delegation Without Deliberation
Ziad D. Baghdadi
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Supporting EV Tourism Trips Through Intermediate and Destination Charging: A Case Study of Lake Michigan Circuit
Amirali Soltanpour
,Sajjad Vosoughinia
,Alireza Rostami
,Mehrnaz Ghamami
,Ali Zockaie
,Robert Jackson
Posted: 22 January 2026
SORT-AI: Agentic System Stability in Large-Scale AI Systems Structural Causes of Cost, Instability, and Non-Determinism in Multi-Agent and Tool-Using Workflows
Gregor Herbert Wegener
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José A. Rodrigues
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,David Pearlmutter
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Amelia Roberts
,Liam Thompson
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Muhammad Nuraddeen Ado
,Jabir Isah Karofi
,Hamisu Mukhtar
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Alex Anvi Eponon
,Moein Shahiki-Tash
,Abdullah -
,Luis Ramos
,Christian Maldonado-Sifuentes
,Gregori Sidorov
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Cytostatic and Pro-Apoptotic Effects of Justicia spicigera Schltdl. on LNCaP Prostate Cancer Cells: Role of G0/G1 Cell Cycle Arrest and Phytochemical Characterization
Ivette Bravo-Espinoza
,Fabiola Hernández-Rosas
,María Elena Hernández-Aguilar
,Marycarmen Godínez-Victoria
,Rodrigo Rafael Ramos-Hernández
,Carlos Alberto López-Rosas
,Santiago González-Periañez
,Ezri Cruz-Pérez
,Fernando Rafael Ramos-Morales
,Tushar Janardan Pawar
Posted: 22 January 2026
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Yi-Chau Chen
,Shi-Ju Huang
,Hsin-Ming Chen
,I-Jong Wang
,Chi-Jr Liao
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Mikhail Liashkov
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Light Exposure Rhythms and Sleep Organization in Adoles-cents: Temporal Differences Between Weekdays and Weekends in an Actigraphic Study
Michael Jackson Oliveira de Andrade Michael
,Emilly Francianne Lamego da Silva Silva
,Guilherme Martins Martins
,Francimara Diniz Ribeiro Ribeiro
,Leonardo Martins Guimaraes Rossi Rossi
,Milena Fernandes de Oliveira Oliveira
,Camila Fernanda Cunha Brandao
,Lucas Rios Drummond
,Lucas Tulio Lacerda Lacerda
,Thais de Fatima Bittencourt Oliveira
Posted: 22 January 2026
Forest Fragmentation and Landscape Dynamics Shaping Human-Elephant Conflict in West Singhbhum, Jharkhand, India
Ainy Latif
,Sharat Kumar Palita
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Sri Suwarni
,Agus Kristiyanto
,Sapja Anantanyu
,Anik Lestari
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Ana Paula Soares
,Guilherme Juliao Zocolo
,Adeney de Freitas Bueno
Posted: 22 January 2026
Benchmarking Ensemble Machine Learning Algorithms for the Early Prediction of Stroke in Imbalanced Clinical Cohorts: A Comparative Analysis and Decision Curve Assessment
Ibrahim Ibrahim Shuaibu
,Yousaf Hussain
Posted: 22 January 2026
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