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The bidirectional relationship between physical health (PH) and depressive symptoms (DS) remains unclear. Data were extracted from the Health and Retirement Study in the United States. PH was measured with a composite of chronic diseases, functional limitations and difficulties in basic and instrumental activities of daily living, and DS with a modified Center for Epidemiological Studies of Depression. Latent growth curve models (LGCM) were employed to examine how the change in PH or DS affected their mutual trajectories in later life. In addition, multilevel models were utilized. There were 6144 participants included, with an average age of 69.82 ± 6.85 years at baseline, of whom 3686 (59.99 %) were women. PH scores increased from 5.65 in 2010 to 7.72 in 2018, while depression scores increased from 1.14 to 1.31. LGCM results showed that the initial levels of PH and DS were associated (β = 0.558, P <.001), and the initial level of PH could predict the trajectory of DS (β = 0.089, P <.001). Likewise, the initial level of DS was also related to initial PH (β = −0.563, P <.001) but couldn't predict the trajectory of PH. Furthermore, the slopes of PH and DS were predicted bidirectionally by each other. Two-level logistic models further demonstrated the bidirectional association between PH and DS. There was a bidirectional association between physical health and depressive symptoms, which highlights the necessity of comprehensive health management for older adults with poor physical health or depression symptoms. • The study examineed the reciprocal association between physical health and depressive symptoms among older adults. • There is a bidirectional relationship between physical health and depressive symptoms. • Highlighting the importance of health management for older adults with poor physical health or depression symptoms. [ABSTRACT FROM AUTHOR]

Metamaterials, artificially engineered materials consisting of subwavelength unit cells, have shown potentials in light manipulation with their extraordinary optical properties. Especially, photonic topological metamaterials possessing topologically protected surface states enable extremely robust control of light. Here, an extremely broadband topological phase in photonic topological metamaterials is demonstrated. In particular, topological surface states are observed for all the frequencies below a certain cut‐off, originating from a double Weyl point at zero frequency. The extreme bandwidth and robustness of the photonic topological metamaterial are beneficial for practical applications such as one‐way waveguide and photonic integrated systems but also advantageous in design and fabrication since the only necessary condition is to satisfy the effective hyperbolic and chiral properties, without entailing strict periodic arrangement. [ABSTRACT FROM AUTHOR]