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Practical limitations, including cost and accessibility, have led to the increasing use of ultrasound as an alternative for skeletal muscle morphological parameters. However, ultrasound measurements are sensitive to evaluation conditions and assessor experience, which has not been sufficiently explored, yet. Therefore, this study investigated the influence of assessor experience on the reliability of ultrasound measurements. A double-blind design was used, involving an experienced assessor (&gt;\u200912,000 images for several years) and multiple inexperienced assessors (&lt;\u2009100 images) to collect data from 39 recreationally active participants. Measurements of muscle architecture were conducted in the leg muscles over two consecutive days, generating 1,248 ultrasound images. Relative and absolute reliability were analyzed using intraclass correlation coefficients (ICCs), standard error of measurement, minimal detectable change, mean absolute error (MAE), mean absolute percentage error (MAPE) and Bland-Altman analyses. Relative reliability was good to excellent in all measurement spots and time-points for muscle thickness (ICC\u2009=\u20090.76\u20130.98) irrespective of assessor experience, except for the inter-day comparison for the gastrocnemius lateralis by the inexperienced assessors, (ICC\u2009=\u20090.58). The pennation angle assessment ranged from insufficient to excellent reliability (ICC\u2009=\u20090.18\u20130.94) and experience contributed greatly to better results. The random error for the inexperienced assessors was reflected in two- to three-times higher MAEs\/MAPEs and limits of agreement in the Bland-Altman analyses, respectively. The findings emphasize the importance of experience and standardization in achieving reliable ultrasound data, particularly for (a) sensitive parameters like the pennation angle and\/or (b) inter-day, intra-subject comparisons.<\/jats:p>","DOI":"10.1186\/s13089-025-00424-6","type":"journal-article","created":{"date-parts":[[2025,3,26]],"date-time":"2025-03-26T06:28:44Z","timestamp":1742970524000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Examiner experience moderates reliability of human lower extremity muscle ultrasound measurement \u2013 a double blinded measurement error study"],"prefix":"10.5826","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4964-2867","authenticated-orcid":false,"given":"Konstantin","family":"Warneke","sequence":"first","affiliation":[]},{"given":"Stanislav D.","family":"Siegel","sequence":"additional","affiliation":[]},{"given":"Jonas","family":"Drabow","sequence":"additional","affiliation":[]},{"given":"Lars H.","family":"Lohmann","sequence":"additional","affiliation":[]},{"given":"Daniel","family":"Jochum","sequence":"additional","affiliation":[]},{"given":"Sandro R.","family":"Freitas","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9","family":"Afonso","sequence":"additional","affiliation":[]},{"given":"Andreas","family":"Konrad","sequence":"additional","affiliation":[]}],"member":"27750","published-online":{"date-parts":[[2025,3,26]]},"reference":[{"issue":"3","key":"424_CR1","doi-asserted-by":"publisher","first-page":"0174","DOI":"10.1007\/s004210050027","volume":"81","author":"T Abe","year":"2000","unstructured":"Abe T, DeHoyos DV, Pollock ML, Garzarella L (2000) Time course for strength and muscle thickness changes following upper and lower body resistance training in men and women. 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