The health benefits of physical activity (PA) have been widely recognized, yet traditional
measures of PA, including questionnaires and category-based assessments of volume and …

Physical activity has consistently been associated with health benefits, including for older
adults (1). As technology has evolved, physical activity research has begun to include more …

Background Declining physical activity (PA) is a hallmark of aging. Wearable technology
provides reliable measures of the frequency, duration, intensity, and timing of PA …

Importance Fragmented daily physical activity may be a sign of physiological decline that
provides more powerful insight into impending mortality than total daily activity. Objective To …

OBJECTIVES To evaluate the Pittsburgh Fatigability Scale (PFS) as a predictor of
performance and functional decline in mobility‐intact older adults. DESIGN Longitudinal …

Fatigue, a “subjective lack of physical and/or mental energy perceived to interfere with usual
or desired activities”(1), is a common symptom among older adults that affects quality of life …

Background Fatigability is a construct that measures whole-body tiredness anchored to
activities of a fixed intensity and duration; little is known about its epidemiology and …

Background Fatigue related to task standardized by duration and intensity, termed
fatigability, could manifest as shortening of activity bouts throughout the day causing daily …

Developments in wearable technology have enabled researchers to continuously and
objectively monitor various aspects and physiological domains of real life including levels of …

Abstract Background The Pittsburgh Performance Fatigability Index (PPFI) quantifies the
percent decline in cadence using accelerometry during standardized walking tasks …