30 October 2019
Vol 11, Issue 516

About The Cover

Cover image expansion

ONLINE COVER Forecasting from Fluctuations. This image shows a healthy elderly couple walking in the woods for daily exercise. Interested in daily activity in the elderly, Li et al. used wrist-worn activity monitors to study fluctuations in ambulatory motor activity patterns in a large cohort of elderly people with follow-up over 13 years. At baseline, more random fluctuations in activity detected over two time scales (between 1 to 90 min and greater than 2 hours) predicted increased frailty, disability, and all-cause mortality. This study demonstrates the potential utility of passive monitoring and fractal physiology (monitoring self-similar patterns that exist across different conditions) for predicting wellness. [CREDIT: ASHLEY COOPER/SCIENCE SOURCE]