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- Title
Dual Roles of Cardiorespiratory Fitness and Fatigability in the Life-Space Mobility of Older Adults: The Study of Muscle, Mobility and Aging (SOMMA).
- Authors
Moored, Kyle D; Qiao, Yujia (Susanna); Rosso, Andrea L; Toledo, Frederico G S; Cawthon, Peggy M; Cummings, Steven R; Goodpaster, Bret H; Kritchevsky, Stephen B; Glynn, Nancy W
- Abstract
Background Cardiorespiratory fitness and perceived fatigability are interrelated components of physical capacity that may jointly influence movement within one's living environment (life-space mobility). We examined whether fitness and fatigability were associated with life-space mobility in community-dwelling older adults, and whether the association of fitness with life-space varied by the level of perceived fatigability. Methods Participants were from the Study of Muscle, Mobility and Aging (SOMMA) baseline cohort (N = 775, mean age 76.1 years). Life Space Assessment scores incorporated level, frequency, and assistance used (personal, devices) for life-space mobility. Fitness was measured as VO2peak from symptom-limited treadmill testing. Fatigability cut-points included: (i) Borg Rating of Perceived Exertion (RPE) ≥ 10 after a fixed-speed (1.5 mph) treadmill test, (ii) the Pittsburgh Fatigability Scale (PFS) Physical ≥ 15, and (iii) PFS Mental ≥ 13. The total count of cut-points was used as a composite fatigability measure (range: 0–3). Linear regressions were adjusted for demographic, lifestyle, and health confounders. Results Better fitness was associated with greater life-space, but the association plateaued at higher fitness levels (VO2peak > 18). Life-space was significantly lower for individuals meeting ≥2 fatigability criteria (vs none), attributable mainly to more severe physical, but not mental, fatigability. In moderation analyses, the fitness–life-space association was significant only for those with RPE ≥ 10 but did not differ by PFS. Conclusion Fitness below a critically low threshold was associated with limited life-space mobility, suggesting that certain older individuals may need to operate close to their maximum aerobic capacity to traverse daily environments; these associations were driven by those with more severe physical fatigability.
- Subjects
OLDER people; CARDIOPULMONARY fitness; RATE of perceived exertion; AGING; AEROBIC capacity; PHYSICAL fitness testing; INTERVAL training
- Publication
Journals of Gerontology Series A: Biological Sciences & Medical Sciences, 2023, Vol 78, Issue 8, p1392
- ISSN
1079-5006
- Publication type
Article
- DOI
10.1093/gerona/glad037