Establishing cardiac MRI reference ranges stratified by sex and age for cardiovascular function during exercise
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Purpose
To evaluate the effects of exercise on left ventricular parameters using exercise cardiac MRI in healthy adults without known cardiovascular disease and establish reference ranges stratified by age and sex.
Materials and Methods
This prospective study included healthy adult participants with no known cardiovascular disease or genetic variants associated with cardiomyopathy, enrolled between January 2018 and April 2021, who underwent exercise cardiac MRI evaluation. Participants were imaged at rest and after exercise, and parameters were measured by two readers. Prediction intervals were calculated and compared across sex and age groups.
Results
The study included 161 participants (mean age, 49 years ± 14 [SD]; 85 female). Compared with the resting state, exercise caused an increase in heart rate (64 beats per minute ± 9 vs 133 beats per minute ± 19, P < .001), left ventricular end-diastolic volume (140 mL ± 32 vs 148 mL ± 35, P < .001), stroke volume (82 mL ± 18 vs 102 mL ± 25, P < .001), ejection fraction (59% ± 6 vs 69% ± 7, P < .001), and cardiac output (5.2 L/min ± 1.1 vs 13.5 L/min ± 3.9, P < .001) and a decrease in left ventricular end-systolic volume (58 mL ± 18 vs 46 mL ± 15, P < .001). There were statistically significant differences in exercise response between groups stratified by sex and age for most parameters.
Conclusion
In healthy adults, an increase in cardiac output after exercise was driven by an increase in heart rate with both increased ventricular filling and emptying. Normal ranges for exercise response, stratified by age and sex, were established as a reference for the use of exercise cardiac MRI in clinical practice.
To evaluate the effects of exercise on left ventricular parameters using exercise cardiac MRI in healthy adults without known cardiovascular disease and establish reference ranges stratified by age and sex.
Materials and Methods
This prospective study included healthy adult participants with no known cardiovascular disease or genetic variants associated with cardiomyopathy, enrolled between January 2018 and April 2021, who underwent exercise cardiac MRI evaluation. Participants were imaged at rest and after exercise, and parameters were measured by two readers. Prediction intervals were calculated and compared across sex and age groups.
Results
The study included 161 participants (mean age, 49 years ± 14 [SD]; 85 female). Compared with the resting state, exercise caused an increase in heart rate (64 beats per minute ± 9 vs 133 beats per minute ± 19, P < .001), left ventricular end-diastolic volume (140 mL ± 32 vs 148 mL ± 35, P < .001), stroke volume (82 mL ± 18 vs 102 mL ± 25, P < .001), ejection fraction (59% ± 6 vs 69% ± 7, P < .001), and cardiac output (5.2 L/min ± 1.1 vs 13.5 L/min ± 3.9, P < .001) and a decrease in left ventricular end-systolic volume (58 mL ± 18 vs 46 mL ± 15, P < .001). There were statistically significant differences in exercise response between groups stratified by sex and age for most parameters.
Conclusion
In healthy adults, an increase in cardiac output after exercise was driven by an increase in heart rate with both increased ventricular filling and emptying. Normal ranges for exercise response, stratified by age and sex, were established as a reference for the use of exercise cardiac MRI in clinical practice.
Date Issued
2025-06-01
Date Acceptance
2025-04-24
Citation
Radiology: Cardiothoracic Imaging, 2025, 7 (3)
ISSN
2638-6135
Publisher
Radiological Society of North America
Journal / Book Title
Radiology: Cardiothoracic Imaging
Volume
7
Issue
3
Copyright Statement
© 2025 by the Radiological Society of North America, Inc. This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Publication Status
Published
Date Publish Online
2025-06-05