{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T22:17:23Z","timestamp":1790720243030,"version":"4.1.0"},"reference-count":24,"publisher":"Journal of Sports Science and Medicine","license":[{"start":{"date-parts":[[2021,3,5]],"date-time":"2021-03-05T00:00:00Z","timestamp":1614902400000},"content-version":"am","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["jsportscimed"],"abstract":"<jats:p>The purpose of this study was to examine whether the NHE with an increased lower leg slope angle would enhance hamstring EMG activity in the final phase of the descend. The hamstring EMG activity was measured, the biceps femoris long head (BFlh) and the semitendinosus (ST). Fifteen male volunteers participated in this study. Subjects performed a prone leg curl with maximal voluntary isometric contraction to normalize the hamstring EMG activity. Subsequently, subjects performed the NHE, with the help of a certified strength and conditioning specialist, while the lower leg slope angle were randomly set at 0\u00b0 (NH), 20\u00b0 (N20), and 40\u00b0 (N40). To compare hamstring EMG activity during the NHE variations, the knee flexion angle was set in the range from 0\u00b0 to 50\u00b0, divided into five phases (0\u201310\u00b0, 10\u201320\u00b0, 20\u201330\u00b0, 30\u201340\u00b0 and 40\u201350\u00b0), where 0\u00b0 indicated that the knee was fully extended. To calculate the knee extension angular velocity, the knee flexion angle divided by time, and break point angle (BPA) was the angle at which 10\u00b0\/s was exceeded. In the statistical analysis, a two-way repeated measures ANOVA was used for the hamstring EMG activity and a one-way repeated measures ANOVA was used for the BPA. The EMG activity of the BFlh and the ST in N20 and N40 was significantly higher than in NH at knee flexion angle of 0\u201320\u00b0 (p &lt; 0.05). For the BPA, NH (57.75\u00b0 \u00b1 13.28\u00b0), N20 (36.27\u00b0 \u00b1 9.89\u00b0) and N40 (16.26\u00b0 \u00b1 9.58\u00b0) were significantly higher in that order (p &lt; 0.05). The results of this study revealed that the NHE with an increased lower leg slope angle shifted the BPA to the lower knee flexion angle and enhanced the hamstring EMG activity in the final phase of the descent.<\/jats:p>","DOI":"10.52082\/jssm.2021.216","type":"journal-article","created":{"date-parts":[[2021,3,5]],"date-time":"2021-03-05T08:10:40Z","timestamp":1614931840000},"page":"216-221","source":"Crossref","is-referenced-by-count":16,"title":["Effect of Different Slopes of the Lower Leg during the Nordic Hamstring Exercise on Hamstring Electromyography Activity"],"prefix":"10.52082","author":[{"given":"Toshiaki","family":"Soga","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daichi","family":"Nishiumi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Atsuya","family":"Furusho","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kei","family":"Akiyama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Norikazu","family":"Hirose","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"29163","published-online":{"date-parts":[[2021,3,5]]},"reference":[{"key":"ref0","doi-asserted-by":"publisher","unstructured":"Askling C.M., Tengvar M., Tarassova O., Thorstensson A. (2014) Acute hamstring injuries in Swedish elite sprinters and jumpers: a prospective randomised controlled clinical trial comparing two rehabilitation protocols. British Journal of Sports Medicine 48, 532-539. https:\/\/doi.org\/10.1136\/bjsports-2013-093214","DOI":"10.1136\/bjsports-2013-093214"},{"key":"ref1","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Askling C.M., Tengvar M., Thorstensson A. (2013) Acute hamstring injuries in Swedish elite football: a prospective randomised controlled clinical trial comparing two rehabilitation protocols. British Journal of Sports Medicine 47, 953-959. https:\/\/doi.org\/10.1136\/bjsports-2013-092165","DOI":"10.1136\/bjsports-2013-092165"},{"key":"ref2","doi-asserted-by":"publisher","unstructured":"Journal of Sports Science and Medicine Bourne M.N., Opar D.A., Williams M.D., Al Najjar A., Shield A.J. (2016) Muscle activation patterns in the Nordic hamstring exercise: Impact of prior strain injury. 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