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Thirty-three healthy volunteers aged 18\u201330 years participated. SMA was recorded using surface electromyography (sEMG), and oral pressure was measured with the Iowa Oral Performance Instrument (IOPI). Each maneuver was performed in four gravitational positions in a randomized order. SMA values were normalized with the maximum isometric voluntary contraction (MVC), and oral pressure was expressed in kilopascals. Repeated-measures ANOVA was used to compare submental muscle activation (%MVC) and tongue pressure (kPa) across swallowing maneuvers (THM, MM, ESM) and gravitational positions (90\u00b0 sitting, 45\u00b0 sitting, supine, lateral decubitus) within subjects. SMA varied significantly across positions and maneuvers (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05). The lowest activation was observed in the lateral decubitus position for all maneuvers, while ESM produced the highest activations.Oral pressure was significantly affected by maneuver type (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), with ESM showing the highest and THM the lowest values. However, no significant effect of body position on oral pressure was found. Swallowing maneuvers showed different results of SMA and oral pressure under different gravitational conditions. Muscle activation decreased as gravity was eliminated, with the lowest values in lateral decubitus position, whereas oral pressure was influenced mainly by maneuver type. Using gravity-eliminated positions in rehabilitation may be considered as a starting point for patients with altered muscle strength and may facilitate gradual progression in rehabilitation. Accordingly, these findings should be interpreted within the limits of physiological measurements and not as indicators of clinical safety or therapeutic benefit.\n                  <\/jats:p>","DOI":"10.1007\/s00455-026-10961-4","type":"journal-article","created":{"date-parts":[[2026,5,23]],"date-time":"2026-05-23T15:04:01Z","timestamp":1779548641000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Comparison of Submental Muscle Activation and Tongue Pressure of Tongue Hold, Effortful Swallow and Mendelsohn Maneuvers in Different Gravitational Positions"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9224-6742","authenticated-orcid":false,"given":"Emre","family":"Cengiz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3062-3861","authenticated-orcid":false,"given":"Rabia","family":"Y\u0131ld\u0131r\u0131m","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1867-9950","authenticated-orcid":false,"given":"\u00d6mer Faruk","family":"Ya\u015faro\u011flu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6308-0237","authenticated-orcid":false,"given":"Numan","family":"Demir","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2463-7503","authenticated-orcid":false,"given":"Selen Serel","family":"Arslan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,5,23]]},"reference":[{"issue":"4","key":"10961_CR1","doi-asserted-by":"publisher","first-page":"691","DOI":"10.1016\/j.pmr.2008.06.001","volume":"19","author":"K Matsuo","year":"2008","unstructured":"Matsuo K, Palmer JB. 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