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Simple equations were validated to estimate lower extremity muscle power measures based on the time to complete the five\u2010repetition sit\u2010to\u2010stand test. The present study was conducted to provide lower extremity muscle power estimates and produce centile values in a large and relatively unselected population across a wide age spectrum.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Data were from the Longevity Check\u2010up 7+ (Lookup 7+) project, an ongoing initiative conducted in unconventional settings (e.g., exhibitions, shopping centres and health promotion campaigns) across Italy to foster adoption of healthy lifestyles. Absolute, relative, allometric and specific muscle power measures of the lower extremities were estimated using validated formulas. Cross\u2010sectional centile and normative values for muscle power measures from 18 to 81+\u00a0years were produced for the two sexes. Smoothed normative curves for men and women were constructed using the lambda\u2013mu\u2013sigma method.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>From 1 June 2015 to 31 October 2021, 13 515 participants were enrolled of whom 12\u00a0864 were eligible for the present study. Mean age was 55.9\u00a0years (standard deviation: 14.8\u00a0years; range: 18\u201398\u00a0years), and 7217 (56.%) were women. Absolute, relative, allometric and specific muscle power declined significantly with age. Specific patterns of decline were observed according to sex and muscle power parameter. Absolute muscle power peaked at 41\u201350 and 31\u201340\u00a0years in men and women, respectively. Afterwards, a decline rate of approximately 12% per decade was observed, regardless of sex. Relative muscle power showed the largest reduction with age, such that it was 40.6% and 46.4% smaller in men and women older than 80, respectively, compared with those aged 18\u201330\u00a0years. Age\u2010related changes in allometric and specific muscle power measures were similar between men and women.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Data from the Lookup 7+ project indicate that lower extremity muscle power estimated using simple equations is significantly associated with age. Sex\u2010specific patterns of decline in absolute and relative muscle power were observed with age. Allometric and specific muscle power declined at a similar rate in men and women.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jcsm.13301","type":"journal-article","created":{"date-parts":[[2023,11,22]],"date-time":"2023-11-22T18:33:05Z","timestamp":1700677985000},"page":"45-54","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Sex\u2010 and age\u2010specific normative values of lower extremity muscle power in Italian community\u2010dwellers"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7482-9514","authenticated-orcid":false,"given":"Helio Jose","family":"Coelho\u2010Junior","sequence":"first","affiliation":[{"name":"Department of Geriatrics and Orthopaedics Universit\u00e0 Cattolica del Sacro Cuore  Rome Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9567-6983","authenticated-orcid":false,"given":"Emanuele","family":"Marzetti","sequence":"additional","affiliation":[{"name":"Department of Geriatrics and Orthopaedics Universit\u00e0 Cattolica del Sacro Cuore  Rome Italy"},{"name":"Fondazione Policlinico Universitario \u2018A. 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