Enhancing Heart Rate-Based Estimation of Energy Expenditure and Exercise Intensity in Patients Post Stroke
Background: Indirect calorimetry is the gold standard field-testing technique for measuring energy expenditure and exercise intensity based on the volume of oxygen consumed (VO<sub>2</sub>, mL O<sub>2</sub>/min). Although heart rate is often used as a proxy for VO<sub>2...
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2024-12-01
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| author | Anna Roto Cataldo Jie Fei Karen J. Hutchinson Regina Sloutsky Julie Starr Stefano M. M. De Rossi Louis N. Awad |
| author_facet | Anna Roto Cataldo Jie Fei Karen J. Hutchinson Regina Sloutsky Julie Starr Stefano M. M. De Rossi Louis N. Awad |
| author_sort | Anna Roto Cataldo |
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| description | Background: Indirect calorimetry is the gold standard field-testing technique for measuring energy expenditure and exercise intensity based on the volume of oxygen consumed (VO<sub>2</sub>, mL O<sub>2</sub>/min). Although heart rate is often used as a proxy for VO<sub>2</sub>, heart rate-based estimates of VO<sub>2</sub> may be inaccurate after stroke due to changes in the heart rate–VO<sub>2</sub> relationship. Our objective was to evaluate in people post stroke the accuracy of using heart rate to estimate relative walking VO<sub>2</sub> (wVO<sub>2</sub>) and classify exercise intensity. Moreover, we sought to determine if estimation accuracy could be improved by including clinical variables related to patients’ function and health in the estimation. Methods: Sixteen individuals post stroke completed treadmill walking exercises with concurrent indirect calorimetry and heart rate monitoring. Using 70% of the data, forward selection regression with repeated k-fold cross-validation was used to build wVO<sub>2</sub> estimation equations that use heart rate alone and together with clinical variables available at the point-of-care (i.e., BMI, age, sex, and comfortable walking speed). The remaining 30% of the data were used to evaluate accuracy by comparing (1) the estimated and actual wVO<sub>2</sub> measurements and (2) the exercise intensity classifications based on metabolic equivalents (METs) calculated using the estimated and actual wVO<sub>2</sub> measurements. Results: Heart rate-based wVO<sub>2</sub> estimates were inaccurate (MAE = 3.11 mL O<sub>2</sub>/kg/min) and unreliable (ICC = 0.68). Incorporating BMI, age, and sex in the estimation resulted in improvements in accuracy (MAE Δ: −36.01%, MAE = 1.99 mL O<sub>2</sub>/kg/min) and reliability (ICC Δ: +20, ICC = 0.88). Improved exercise intensity classifications were also observed, with higher accuracy (Δ: +29.85%, from 0.67 to 0.87), kappa (Δ: +108.33%, from 0.36 to 0.75), sensitivity (Δ: +30.43%, from 0.46 to 0.60), and specificity (Δ: +17.95%, from 0.78 to 0.92). Conclusions: In people post stroke, heart rate-based wVO<sub>2</sub> estimations are inaccurate but can be substantially improved by incorporating clinical variables readily available at the point of care. |
| format | Article |
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| institution | OA Journals |
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| publishDate | 2024-12-01 |
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| spelling | doaj-art-bb7d0d224d25412e948ea53ac8aedbd12025-08-20T02:01:00ZengMDPI AGBioengineering2306-53542024-12-011112125010.3390/bioengineering11121250Enhancing Heart Rate-Based Estimation of Energy Expenditure and Exercise Intensity in Patients Post StrokeAnna Roto Cataldo0Jie Fei1Karen J. Hutchinson2Regina Sloutsky3Julie Starr4Stefano M. M. De Rossi5Louis N. Awad6Department of Physical Therapy, Sargent College of Health and Rehabilitation Sciences, Boston University, Boston, MA 02215, USADepartment of Physical Therapy, Sargent College of Health and Rehabilitation Sciences, Boston University, Boston, MA 02215, USADepartment of Physical Therapy, Sargent College of Health and Rehabilitation Sciences, Boston University, Boston, MA 02215, USADepartment of Physical Therapy, Sargent College of Health and Rehabilitation Sciences, Boston University, Boston, MA 02215, USADepartment of Physical Therapy, Sargent College of Health and Rehabilitation Sciences, Boston University, Boston, MA 02215, USADepartment of Physical Therapy, Sargent College of Health and Rehabilitation Sciences, Boston University, Boston, MA 02215, USADepartment of Physical Therapy, Sargent College of Health and Rehabilitation Sciences, Boston University, Boston, MA 02215, USABackground: Indirect calorimetry is the gold standard field-testing technique for measuring energy expenditure and exercise intensity based on the volume of oxygen consumed (VO<sub>2</sub>, mL O<sub>2</sub>/min). Although heart rate is often used as a proxy for VO<sub>2</sub>, heart rate-based estimates of VO<sub>2</sub> may be inaccurate after stroke due to changes in the heart rate–VO<sub>2</sub> relationship. Our objective was to evaluate in people post stroke the accuracy of using heart rate to estimate relative walking VO<sub>2</sub> (wVO<sub>2</sub>) and classify exercise intensity. Moreover, we sought to determine if estimation accuracy could be improved by including clinical variables related to patients’ function and health in the estimation. Methods: Sixteen individuals post stroke completed treadmill walking exercises with concurrent indirect calorimetry and heart rate monitoring. Using 70% of the data, forward selection regression with repeated k-fold cross-validation was used to build wVO<sub>2</sub> estimation equations that use heart rate alone and together with clinical variables available at the point-of-care (i.e., BMI, age, sex, and comfortable walking speed). The remaining 30% of the data were used to evaluate accuracy by comparing (1) the estimated and actual wVO<sub>2</sub> measurements and (2) the exercise intensity classifications based on metabolic equivalents (METs) calculated using the estimated and actual wVO<sub>2</sub> measurements. Results: Heart rate-based wVO<sub>2</sub> estimates were inaccurate (MAE = 3.11 mL O<sub>2</sub>/kg/min) and unreliable (ICC = 0.68). Incorporating BMI, age, and sex in the estimation resulted in improvements in accuracy (MAE Δ: −36.01%, MAE = 1.99 mL O<sub>2</sub>/kg/min) and reliability (ICC Δ: +20, ICC = 0.88). Improved exercise intensity classifications were also observed, with higher accuracy (Δ: +29.85%, from 0.67 to 0.87), kappa (Δ: +108.33%, from 0.36 to 0.75), sensitivity (Δ: +30.43%, from 0.46 to 0.60), and specificity (Δ: +17.95%, from 0.78 to 0.92). Conclusions: In people post stroke, heart rate-based wVO<sub>2</sub> estimations are inaccurate but can be substantially improved by incorporating clinical variables readily available at the point of care.https://www.mdpi.com/2306-5354/11/12/1250volume of oxygen consumedheart ratesubject-specific estimationexercise intensityrelative VO<sub>2</sub>stroke |
| spellingShingle | Anna Roto Cataldo Jie Fei Karen J. Hutchinson Regina Sloutsky Julie Starr Stefano M. M. De Rossi Louis N. Awad Enhancing Heart Rate-Based Estimation of Energy Expenditure and Exercise Intensity in Patients Post Stroke Bioengineering volume of oxygen consumed heart rate subject-specific estimation exercise intensity relative VO<sub>2</sub> stroke |
| title | Enhancing Heart Rate-Based Estimation of Energy Expenditure and Exercise Intensity in Patients Post Stroke |
| title_full | Enhancing Heart Rate-Based Estimation of Energy Expenditure and Exercise Intensity in Patients Post Stroke |
| title_fullStr | Enhancing Heart Rate-Based Estimation of Energy Expenditure and Exercise Intensity in Patients Post Stroke |
| title_full_unstemmed | Enhancing Heart Rate-Based Estimation of Energy Expenditure and Exercise Intensity in Patients Post Stroke |
| title_short | Enhancing Heart Rate-Based Estimation of Energy Expenditure and Exercise Intensity in Patients Post Stroke |
| title_sort | enhancing heart rate based estimation of energy expenditure and exercise intensity in patients post stroke |
| topic | volume of oxygen consumed heart rate subject-specific estimation exercise intensity relative VO<sub>2</sub> stroke |
| url | https://www.mdpi.com/2306-5354/11/12/1250 |
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