{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,26]],"date-time":"2026-07-26T04:56:29Z","timestamp":1785041789513,"version":"3.55.0"},"reference-count":29,"publisher":"Journal of Orthopaedic & Sports Physical Therapy (JOSPT)","issue":"2","content-domain":{"domain":["www.jospt.org"],"crossmark-restriction":true},"short-container-title":["Journal of Orthopaedic &amp; Sports Physical Therapy"],"published-print":{"date-parts":[[2018,2]]},"abstract":"<jats:sec><jats:title>Study Design<\/jats:title><jats:p> Reliability and case-control injury study. <\/jats:p><\/jats:sec><jats:sec><jats:title>Background<\/jats:title><jats:p> Knee flexor strength is a key variable when dealing with hamstring strain injury (HSI), and methodologies of objective measurement of strength are often limited to single exercises. <\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p> To establish test-retest reliability of a novel apparatus to measure knee flexor strength during various hamstring exercises, and to investigate whether the measure can detect between-leg differences in male participants with and without history of unilateral HSI. <\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p> Twenty male participants without and 10 male participants with previous unilateral HSI participated. Isometric knee flexor strength and peak rate of force development (RFD) at 0\u00b0\/0\u00b0, 45\u00b0\/45\u00b0, and 90\u00b0\/90\u00b0 of hip\/knee flexion were measured, as well as force impulse during bilateral and unilateral variations of an eccentric slider and hamstring bridge, using a novel apparatus. Intraclass correlation coefficient (ICC), typical error, and typical error as a coefficient of variation were calculated for all measures. The magnitudes of between-leg differences within each group were calculated using estimates of effect sizes, reported as Cohen's d and 90% confidence interval (CI). <\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p> Moderate to high test-retest reliability was observed for isometric knee flexor strength (ICC = 0.87\u20130.92) and peak RFD (ICC = 0.88\u20130.95) across 3 positions and for mean force impulse during the eccentric slider (ICC = 0.83\u20130.90). In those with prior HSI, large deficits were observed in the previously injured leg compared to the contralateral uninjured leg for mean force impulse during the unilateral eccentric slider (d = \u22121.09; 90% CI: \u22120.20, \u22121.97), isometric strength at 0\u00b0\/0\u00b0 (d = \u22121.06; 90% CI: \u22120.18, \u22121.93) and 45\u00b0\/45\u00b0 (d = \u22120.88; 90% CI: \u22120.02, \u22121.74), and peak RFD at 45\u00b0\/45\u00b0 (d = \u22120.88; 90% CI: \u22120.02, \u22121.74). <\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p> The novel apparatus provides a reliable measure of isometric knee flexor strength, peak RFD, and force impulse during an eccentric slider, with deficits seen in previously injured hamstrings for these measures. J Orthop Sports Phys Ther 2018;48(2):72\u201380. 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