Journal Pre-proofs High density muscle size and muscle power are associated with both gait and sit-to-stand kinematic parameters in frail nonagenarians Nora Millor, Eduardo L. Cadore, Marisol Gómez, Alicia Martínez, Pablo Lecumberri, Jon Martirikorena, Fernando Idoate, Mikel Izquierdo PII: S0021-9290(20)30182-2 DOI: https://doi.org/10.1016/j.jbiomech.2020.109766 Reference: BM 109766 To appear in: Journal of Biomechanics Accepted Date: 26 March 2020 Please cite this article as: N. Millor, E.L. Cadore, M. Gómez, A. Martínez, P. Lecumberri, J. Martirikorena, F. Idoate, M. Izquierdo, High density muscle size and muscle power are associated with both gait and sit-to-stand kinematic parameters in frail nonagenarians, Journal of Biomechanics (2020), doi: https://doi.org/10.1016/ j.jbiomech.2020.109766 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Published by Elsevier Ltd.