6 papers
A functional joint model with baseline functional covariates: linking sitting accumulation patterns to physical function and mortality among older women
Luo Xiao, Wenyi Wang, Yumeng Zhang +3
In large-scale epidemiological studies, it is often of interest to investigate joint relationships between longitudinal and time-to-event outcomes with exposures that are trajector…
Modeling Physical Activity Change as Smooth Transformations: Temporal and Amplitude Patterns Associated with Physical Function in Older Women
Rong W. Zablocki, Steve Nguyen, Yacun Wang +11
Purpose: To investigate whether longitudinal changes in timing and magnitude of PA are associated with physical function (PF) in older women. Methods: Women from OPACH study with a…
MoCA: Multi-modal Cross-masked Autoencoder for Time Series in Digital Health
Howon Ryu, Yuliang Chen, Yacun Wang +5
Wearable devices enable continuous multi-modal physiological and behavioral monitoring, yet analysis of these data streams faces fundamental challenges including the lack of gold-s…
A linear mixed model approach for measurement error adjustment: applications to sedentary behavior assessment from wearable devices
Ruohui Chen, Dori Rosenberg, Chongzhi Di +6
In recent years, wearable devices have become more common to capture a wide range of health behaviors, especially for physical activity and sedentary behavior. These sensor-based m…
Sedentary Behavior Estimation with Hip-worn Accelerometer Data: Segmentation, Classification and Thresholding
Yiren Wang, Fatima Tuz-Zahra, Rong Zablocki +9
Cohort studies are increasingly using accelerometers for physical activity and sedentary behavior estimation. These devices tend to be less error-prone than self-report, can captur…
A Riemann Manifold Model Framework for Longitudinal Changes in Physical Activity Patterns
Jingjing Zou, Tuo Lin, Chongzhi Di +7
Physical activity (PA) is significantly associated with many health outcomes. The wide usage of wearable accelerometer-based activity trackers in recent years has provided a unique…