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The Jamar hydraulic dynamometer, backed by strong clinical and epidemiological data, is widely used; however, weight and calibration requirements may limit use. Digital models such as InGrip offer stable calibration and ergonomic design. This study aimed to validate accuracy, reliability, and diagnostic performance of InGrip versus the Jamar.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>A cross-sectional, randomized, single-center study of 415 community-dwelling older adults (mean age: 75.3\u2009\u00b1\u20096.5\u00a0years). Handgrip strength was measured with both devices per the Southampton protocol. Correlation and agreement (Bland\u2013Altman, ICC) between InGrip and the reference dynamometer (Jamar) were analyzed, and diagnostic capacity via ROC curves, estimating sensitivity, specificity, and predictive values for low handgrip strength per EWGSOP2 criteria.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The InGrip dynamometer showed strong correlation with the Jamar dynamometer (r\u2009=\u20090.95) and excellent agreement (ICC\u2009=\u20090.94), intra-observer (ICC\u2009=\u20090.96), and inter-observer (ICC\u2009=\u20090.96), with a mean bias of \u2212\u20090.37\u00a0kg and limits of agreement from \u2013\u20094.45 to 3.72\u00a0kg. Its diagnostic capacity was high (AUC women\u2009=\u20090.968; AUC men\u2009=\u20090.982). Optimal cutoffs were\u2009\u2264\u200918\u00a0kg for women (sensitivity\u2009=\u200992.6%, specificity\u2009=\u200990.5%) and\u2009\u2264\u200927.5\u00a0kg for men (sensitivity\u2009=\u200996%, specificity\u2009=\u200993%).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The InGrip digital dynamometer showed excellent validity, reliability, and diagnostic accuracy compared to the Jamar in community-dwelling older adults, with sex-specific cutoffs aligned with EWGSOP2 criteria, supporting its use as a practical alternative for strength assessment in research and clinical practice.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Trial registration<\/jats:title>\n                    <jats:p>ClinicalTrials.gov NCT06623019.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s41999-025-01403-9","type":"journal-article","created":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T12:43:22Z","timestamp":1772109802000},"page":"1169-1179","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Validity, reliability, and diagnostic accuracy of the InGrip digital dynamometer compared with the Jamar hydraulic model in older adults"],"prefix":"10.1007","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8349-0441","authenticated-orcid":false,"given":"Luis","family":"Polo-Ferrero","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto","family":"M\u00e9ndez-S\u00e1nchez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Mart\u00edn-Vallejo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Torres-Alonso","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marta Beatriz","family":"Carrera-Villegas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fausto J.","family":"Barbero-Iglesias","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alfonso J.","family":"Cruz-Jentoft","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatriz","family":"Montero-Errasqu\u00edn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,2,26]]},"reference":[{"key":"1403_CR1","doi-asserted-by":"publisher","first-page":"16","DOI":"10.1093\/AGEING\/AFY169","volume":"48","author":"AJ Cruz-Jentoft","year":"2019","unstructured":"Cruz-Jentoft AJ, Bahat G, Bauer J, Boirie Y, Bruy\u00e8re O, Cederholm T et al (2019) Sarcopenia: revised European consensus on definition and diagnosis. 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The manufacturer of the InGrip dynamometer had no participation in the conception or design of the study; the acquisition, analysis, or interpretation of data; the writing of the manuscript; or the decision to publish the results.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"This study was conducted in accordance with the principles outlined in the Declaration of Helsinki and received approval from the Comit\u00e9 de \u00c9tica de la Investigaci\u00f3n con Medicamentos del \u00c1rea de Salud de Salamanca (PI code: ICPS-I 24 2050). Prior to participation, all individuals were informed about the study's objectives, as well as the potential risks and benefits associated with the procedures involved. Informed consent was obtained from all participants. Furthermore, participant confidentiality was strictly maintained throughout the study, in compliance with the provisions of Organic Law 3\/2018 of December 5 on the Protection of Personal Data and Guarantee of Digital Rights, Law 14\/2007 of July 3 on Biomedical Research, and Regulation (EU) 2016\/679 of the European Parliament and of the Council of April 27, 2016 (RGPD).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics"}},{"value":"Informed consent was obtained from all individual participants included in the study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}}]}}