The formula by which Fitness Age is calculated was not reported in the section Results, Fitness age definition and components, below table 2:
“
Where means (µ) and standard deviations (σ) were computed on this dataset:
TUGtime (s): µ = 6.69; σ = 1.38
Handgripnormalized (by bodyweight in kg): µ = 0.37; σ = 0.11
6MWTdistance (m): µ = 502.38; σ = 74.94
fast10MWTtime (s): µ = 4.75; σ = 0.93
4SSTtime (s): µ = 3.67; σ = 0.81
StrongerQuadStrengthnormalized (by bodyweight in kg): µ = 0.56; σ = 0.13”
Statements
Publisher’s note
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Summary
Keywords
biological age-chronological age, aging, cardiovascular diseases, 6-min walking test, timed “up and go” test, ten meter walk test, handgrip test
Citation
Manca A, Fiorito G, Morrone M, Boi A, Mercante B, Martinez G, Ventura L, Delitala AP, Cano A, Catte MG, Solinas G, Melis F, Ginatempo F and Deriu F (2025) Addendum: A novel estimate of biological aging by multiple fitness tests is associated with risk scores for age-related diseases. Front. Physiol. 16:1738830. doi: 10.3389/fphys.2025.1738830
Received
03 November 2025
Revised
14 November 2025
Accepted
24 November 2025
Published
19 December 2025
Approved by
Frontiers Editorial Office, Frontiers Media SA, Switzerland
Volume
16 - 2025
Updates
Copyright
© 2025 Manca, Fiorito, Morrone, Boi, Mercante, Martinez, Ventura, Delitala, Cano, Catte, Solinas, Melis, Ginatempo and Deriu.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: F. Deriu, deriuf@uniss.it
‡These authors have contributed equally to this work
ORCID: F. Deriu, orcid.org/0000-0001-8235-6091
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.