Unknown

Dataset Information

0

Fractal Complexity of Daily Physical Activity Patterns Differs With Age Over the Life Span and Is Associated With Mortality in Older Adults.


ABSTRACT:

Background

Accelerometers are included in a wide range of devices that monitor and track physical activity for health-related applications. However, the clinical utility of the information embedded in their rich time-series data has been greatly understudied and has yet to be fully realized. Here, we examine the potential for fractal complexity of actigraphy data to serve as a clinical biomarker for mortality risk.

Methods

We use detrended fluctuation analysis (DFA) to analyze actigraphy data from the National Health and Nutrition Examination Survey (NHANES; n = 11,694). The DFA method measures fractal complexity (signal self-affinity across time-scales) as correlations between the amplitude of signal fluctuations in time-series data across a range of time-scales. The slope, ?, relating the fluctuation amplitudes to the time-scales over which they were measured describes the complexity of the signal.

Results

Fractal complexity of physical activity (?) decreased significantly with age (p = 1.29E-6) and was lower in women compared with men (p = 1.79E-4). Higher levels of moderate-to-vigorous physical activity in older adults and in women were associated with greater fractal complexity. In adults aged 50-79 years, lower fractal complexity of activity (?) was associated with greater mortality (hazard ratio = 0.64; 95% confidence interval = 0.49-0.82) after adjusting for age, exercise engagement, chronic diseases, and other covariates associated with mortality.

Conclusions

Wearable accelerometers can provide a noninvasive biomarker of physiological aging and mortality risk after adjusting for other factors strongly associated with mortality. Thus, this fractal analysis of accelerometer signals provides a novel clinical application for wearable accelerometers, advancing efforts for remote monitoring of physiological health by clinicians.

SUBMITTER: Raichlen DA 

PROVIDER: S-EPMC6696714 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

altmetric image

Publications

Fractal Complexity of Daily Physical Activity Patterns Differs With Age Over the Life Span and Is Associated With Mortality in Older Adults.

Raichlen David A DA   Klimentidis Yann C YC   Hsu Chiu-Hsieh CH   Alexander Gene E GE  

The journals of gerontology. Series A, Biological sciences and medical sciences 20190801 9


<h4>Background</h4>Accelerometers are included in a wide range of devices that monitor and track physical activity for health-related applications. However, the clinical utility of the information embedded in their rich time-series data has been greatly understudied and has yet to be fully realized. Here, we examine the potential for fractal complexity of actigraphy data to serve as a clinical biomarker for mortality risk.<h4>Methods</h4>We use detrended fluctuation analysis (DFA) to analyze act  ...[more]

Similar Datasets

| S-EPMC10663528 | biostudies-literature
| S-EPMC6262680 | biostudies-other
| S-EPMC5905637 | biostudies-literature
| S-EPMC8141352 | biostudies-literature
| S-EPMC3575120 | biostudies-literature
| S-EPMC9194653 | biostudies-literature
| S-EPMC7052590 | biostudies-literature
| S-EPMC8408523 | biostudies-literature
| S-EPMC7141241 | biostudies-literature
| S-EPMC7681045 | biostudies-literature