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Fatigability as a function of physical activity energy expenditure in older adults |
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| Authors: | Maciej S. Buchowski Sandra F. Simmons Lauren E. Whitaker James Powers Linda Beuscher Leena Choi T. Alp Ikizler Kong Chen John F. Shnelle |
| Affiliation: | 1. Energy Balance Laboratory, Division of Gastroenterology, Hepatology and Nutrition, Department of Medicine, Vanderbilt University, 1161 21st Avenue South, Nashville, TN, 37232, USA 10. Vanderbilt University, Nashville, TN, USA 3. Center for Quality of Aging, Department of Medicine, Division of General Internal Medicine and Public Health, Vanderbilt University, Nashville, TN, USA 7. Veterans Administration, Tennessee Valley Health Care System, Geriatric Research Education and Clinical Center (GRECC), Nashville, TN, USA 9. Clinical Research Center, Department of Medicine, Vanderbilt University, 1161 21st Avenue South, Nashville, TN, 37232, USA 4. Department of Medicine, Division of General Internal Medicine and Public Health, Vanderbilt University, Nashville, TN, USA 5. School of Nursing, Vanderbilt University, Nashville, TN, USA 6. Department of Biostatistics, Vanderbilt University, Nashville, TN, USA 2. Division of Nephrology, Department of Medicine, Vanderbilt University, Nashville, TN, USA 8. Human Energy and Body Weight Regulation Section, Diabetes, Endocrinology, and Obesity Branch, Division of Intramural Research/NIDDK, National Institutes of Health, Bethesda, MD, USA |
| Abstract: | Increased fatigue is a predictor of morbidity and mortality in older adults. Fatigability defines a change in performance or self-reported fatigue in response to physical activity (PA). However, the relationship of fatigability to PA-related energy expenditure (PAEE) is unknown. Changes in performance, fatigue, and energy expenditure were measured simultaneously in 17 adults (11 females, 74–94 years old) performing eight standardized PA tasks with various energy expenditure requirements in a whole-room indirect calorimeter. Change in performance was objectively measured using a PA movement monitor and change in fatigue was self-reported on a seven-point scale for each task. Performance and perceived fatigability severity scores were calculated as a ratio of change in performance and fatigue, respectively, and PAEE. We found that change in both objective performance and self-reported fatigue were associated with energy expenditure (Spearman rho = −0.72 and −0.68, respectively, p < 0.001) on a task requiring relatively high level of energy expenditure. The performance and perceived fatigability severity scores were significantly correlated (rho = 0.77, p < 0.001) on this task. In summary, results of this proof of concept pilot study show that both perceived and performance fatigability severity scores are related to PAEE-induced fatigue on a task requiring relatively high level of energy expenditure. We conclude that fatigability severity is a valid measure of PAEE-induced fatigue in older adults. |
| Keywords: | Aging Fatigue Tiredness Resting energy expenditure Physical activity |
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