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INTRODUCTION: Efforts to study performance fatigability have been limited because of measurement constrains. Accelerometry and advanced statistical methods may enable us to quantify performance fatigability more granularly via objective detection of performance decline. Thus, we developed the Pittsburgh Performance Fatigability Index (PPFI) using triaxial raw accelerations from wrist-worn accelerometer from two in-laboratory 400-m walks. METHODS: Sixty-three older adults from our cross-sectional study (mean age, 78 yr; 56% women; 88% White) completed fast-paced ( n = 59) and/or usual-paced 400-m walks ( n = 56) with valid accelerometer data. Participants wore ActiGraph GT3X+ accelerometers (The ActiGraph LLC, Pensacola, FL) on nondominant wrist during the walking task. Triaxial raw accelerations from accelerometers were used to compute PPFI, which quantifies percentage of area under the observed gait cadence-versus-time trajectory during a 400-m walk to a hypothetical area that would be produced if the participant sustained maximal cadence throughout the entire walk. RESULTS: Higher PPFI scores (higher score = greater fatigability) correlated with worse physical function, slower chair stands speed and gait speed, worse cardiorespiratory fitness and mobility, and lower leg peak power (| ρ | = 0.36-0.61 from fast-paced and | ρ | = 0.28-0.67 from usual-paced walks, all P < 0.05). PPFI scores from both walks remained associated with chair stands speed, gait speed, fitness, and mobility, after adjustment for sex, age, race, weight, height, and smoking status; PPFI scores from the fast-paced walk were associated with leg peak power. CONCLUSIONS: Our findings revealed that the objective PPFI is a sensitive measure of performance fatigability for older adults and can serve as a risk assessment tool or outcome measure in future studies and clinical practice.
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Acelerometria , Caminhada , Idoso , Estudos Transversais , Fadiga , Feminino , Marcha , Humanos , MasculinoRESUMO
OBJECTIVE: We examined the feasibility and benefit of integrating occupational therapy into a long-term services and supports (LTSS) care coordination program for aging in place. METHOD: Clients referred to occupational therapy during a 16-wk trial were evaluated with the In-Home Occupational Performance Evaluation and received education on strategies for aging in place. Clients who indicated readiness for change were assisted in setting personalized goals with goal attainment scaling and received four additional occupational therapy visits. RESULTS: Of the program's feasibility benchmarks, 87% were met. Twenty-three clients were referred, and 16 clients were evaluated; 37.5% of those evaluated indicated readiness for change, establishing 18 goals with 100% goal attainment. CONCLUSION: Integration of occupational therapy into an LTSS care coordination program was feasible. Benefits of adding occupational therapy included a performance-based evaluation that revealed personal factors as barriers to aging in place and gave access to a client-centered service to maximize independence.