{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T23:25:18Z","timestamp":1789169118159,"version":"build-2803163510"},"reference-count":161,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2025,12,7]],"date-time":"2025-12-07T00:00:00Z","timestamp":1765065600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Background: This study aimed to examine the immediate effects of the Nordic Hamstring Exercise (NHE) on the stiffness of the biceps femoris (BF) and semitendinosus (ST) muscles. Methods: This parallel-group randomised controlled trial followed CONSORT 2025 guidelines. Twenty-four physically active adults (16 females, 8 males) were randomly assigned to an NHE group (n = 12) or a control group (n = 12) using 1:1 gender-stratified randomisation. The NHE group performed 3 sets of 10 repetitions of the NHE, while the control group remained inactive. Muscle stiffness of the BF and ST was assessed pre- and post-intervention using the MyotonPro device. Results: No significant overall changes in hamstring stiffness were observed within or between groups (p &gt; 0.05). Within the NHE group, the ST tended to increase in stiffness (11.25 N\/m, p = 0.057), while the BF showed a small, non-significant reduction (\u221212.00 N\/m, p = 0.696). The difference in changes between BF and ST was significant (p = 0.039). Independent of group allocation, males demonstrated significantly higher baseline stiffness than females for BF (258.13 vs. 195.81 N\/m, p &lt; 0.001) and for ST (247.88 vs. 174.00 N\/m, p = 0.003). Regression analysis showed that only height predicted the change in ST stiffness after NHE (R = 0.625, R2 = 0.39, p = 0.030). Conclusions: A single NHE session did not alter overall hamstring stiffness but produced opposite, muscle-specific effects. More research with larger, uniform samples is needed to confirm these findings.<\/jats:p>","DOI":"10.3390\/jcm14248677","type":"journal-article","created":{"date-parts":[[2025,12,8]],"date-time":"2025-12-08T16:20:29Z","timestamp":1765210829000},"page":"8677","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Acute Effects of Nordic Hamstring Exercise on Hamstring Stiffness: A Randomised Controlled Trial"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9214-1948","authenticated-orcid":false,"given":"Gokhan","family":"Yagiz","sequence":"first","affiliation":[{"name":"Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Amasya University, 05100 Amasya, Turkey"},{"name":"Department of Physical Therapy, Faculty of Health Sciences, Tokyo Metropolitan University, Tokyo 92-0397, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4291-958X","authenticated-orcid":false,"given":"Cristina","family":"Monle\u00f3n","sequence":"additional","affiliation":[{"name":"Faculty of Physical Education and Sports Sciences, Catholic University of Valencia San Vicente M\u00e1rtir, 46001 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0305-4632","authenticated-orcid":false,"given":"Esedullah","family":"Akaras","sequence":"additional","affiliation":[{"name":"Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Erzurum Technical University, 25050 Erzurum, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sena","family":"Adanir","sequence":"additional","affiliation":[{"name":"Independent Researcher, 25050 Erzurum, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2617-4549","authenticated-orcid":false,"given":"Encarnaci\u00f3n","family":"Li\u00e9bana","sequence":"additional","affiliation":[{"name":"Faculty of Physical Education and Sports Sciences, Catholic University of Valencia San Vicente M\u00e1rtir, 46001 Valencia, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,12,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1080\/00913847.2023.2170684","article-title":"Epidemiology of hamstring injuries in 538 cases from an FC Barcelona multi sports club","volume":"52","author":"Gudelis","year":"2024","journal-title":"Physician Sportsmed."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"757","DOI":"10.1136\/bjsm.2005.018135","article-title":"Epidemiology of injuries in English professional rugby union: Part 1 match injuries","volume":"39","author":"Brooks","year":"2005","journal-title":"Br. 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