Cross-sectional associations between 24-hour time-use composition, grey matter volume and cognitive function in healthy older adults.

"all inferential statistics were conducted in r version 4 2 2 and the code used for data analysis is available at https://github com/maddisonmellow/time-use-brainvol-paper ."

"all inferential statistics were conducted in r version 4 2 2 and the code used for data analysis is available at https://github com/maddisonmellow/time-use-brainvol-paper ."

"Declarations Ethics approval and consent to participateEthics approval was obtained from the University of South Australia and University of Newcastle Human Research Ethics Committee (202639). Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding MM was supported by a Dementia Australia Research Foundation PhD scholarship. The ACTIVate study is funded by an NHMRC Boosting Dementia Research Priority Round 5 grant (GNT1171313, $1.23 m). DD was supported by an NHMRC Early Career Fellowship (GNT1162166, 2019–2022) and an ARC Discovery Early Career Award (DE230101174, 2023–2025). MG was supported by an Australian Research Council (ARC) fellowship (DE200100575). TS was supported by a Hospital Research Foundation grant (C-PJ-008-Transl-2020) awarded to AS and DD. AS was supported by a Dementia Australia Henry Brodaty Mid-Career Fellowship. The funding bodies were not involved the design or conduct of the study; collection, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or the decision to submit the manuscript for peer-reviewed publication."

"The ACTIVate study was registered with the Australia New Zealand Clinical Trials Registry (ACTRN12619001659190) on November 27, 2019. Ethics approval was obtained from the University of South Australia and University of Newcastle Human Research Ethics Committee (202639). All procedures were conducted in accordance with the Declaration of Helsinki."