{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T05:28:26Z","timestamp":1787030906617,"version":"build-2736575974"},"reference-count":35,"publisher":"National Athletic Trainers' Association","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,7,1]]},"abstract":"<jats:sec>\n                    <jats:title>Context<\/jats:title>\n                    <jats:p>Anterior cruciate ligament (ACL) injury risk can be assessed from landing biomechanics. Greater hamstrings stiffness is associated with a landing-biomechanics profile consistent with less ACL loading but is difficult to assess in the clinical setting. Eccentric hamstrings strength can be easily evaluated by clinicians and may provide a surrogate measure for hamstrings stiffness.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To examine associations among eccentric hamstrings strength, hamstrings stiffness, and landing biomechanics linked to ACL injury risk.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>Cross-sectional study.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Setting<\/jats:title>\n                    <jats:p>Research laboratory.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Patients or Other Participants<\/jats:title>\n                    <jats:p>A total of 34 uninjured, physically active participants (22 women, 12 men; age = 20.2 \u00b1 1.6 years, height = 171.5 \u00b1 9.7 cm, mass = 67.1 \u00b1 12.7 kg).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Intervention(s)<\/jats:title>\n                    <jats:p>We collected eccentric hamstrings strength, active hamstrings stiffness, and double- and single-legged landing biomechanics during a single session.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Main Outcome Measure(s)<\/jats:title>\n                    <jats:p>Bivariate associations were conducted between eccentric hamstrings strength and hamstrings stiffness, vertical ground reaction force, internal knee-extension moment, internal knee-varus moment, anterior tibial shear force, knee sagittal-plane angle at initial ground contact, peak knee-flexion angle, knee frontal-plane angle at initial ground contact, peak knee-valgus angle, and knee-flexion displacement using Pearson product moment correlations or Spearman rank-order correlations.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>We observed no association between hamstrings stiffness and eccentric hamstrings strength (r = 0.029, P = .44). We also found no association between hamstrings stiffness and landing biomechanics. However, greater peak eccentric strength was associated with less vertical ground reaction force in both the double-legged (r = \u22120.331, P = .03) and single-legged (r = \u22120.418, P = .01) landing conditions and with less internal knee-varus moment in the single-legged landing condition (r = \u22120.326, P = .04).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Eccentric hamstrings strength was associated with less vertical ground reaction force during both landing tasks and less internal knee-varus moment during the single-legged landing but was not an acceptable clinical estimate of active hamstrings stiffness.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.4085\/1062-6050-151-19","type":"journal-article","created":{"date-parts":[[2020,5,20]],"date-time":"2020-05-20T16:46:41Z","timestamp":1589993201000},"page":"717-723","source":"Crossref","is-referenced-by-count":27,"title":["Associations Among Eccentric Hamstrings Strength, Hamstrings Stiffness, and Jump-Landing Biomechanics"],"prefix":"10.4085","volume":"55","author":[{"given":"Derek R.","family":"Dewig","sequence":"first","affiliation":[{"name":"MOTION Science Institute, University of North Carolina at Chapel Hill"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan S.","family":"Goodwin","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy Education, Elon University, NC"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian G.","family":"Pietrosimone","sequence":"additional","affiliation":[{"name":"MOTION Science Institute, University of North Carolina at Chapel Hill"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. Troy","family":"Blackburn","sequence":"additional","affiliation":[{"name":"MOTION Science Institute, University of North Carolina at Chapel Hill"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"2557","published-online":{"date-parts":[[2020,5,20]]},"reference":[{"key":"2020072313162368700_i1062-6050-55-7-717-b01","doi-asserted-by":"crossref","unstructured":"Mall\n              NA,\n            \n            \n              Chalmers\n              PN,\n            \n            \n              Moric\n              M,\n            \n            et al.\n\t\t\t\t\t\n          Incidence and trends of anterior cruciate ligament reconstruction in the United States.\n\t\t\t\t\tAm J Sports Med.\n\t\t\t\t\t2014;\n\t\t\t\t\t42(10):\n\t\t\t\t\t2363\u2013\n\t\t\t\t\t2370.","DOI":"10.1177\/0363546514542796"},{"key":"2020072313162368700_i1062-6050-55-7-717-b02","doi-asserted-by":"crossref","unstructured":"Losciale\n              JM,\n            \n            \n              Zdeb\n    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