{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T20:01:12Z","timestamp":1792526472451,"version":"4.5.0"},"reference-count":70,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2022,12,3]],"date-time":"2022-12-03T00:00:00Z","timestamp":1670025600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>Background: This study aimed to determine the validity and reliability of the countermovement jump (CMJ) as a dynamic eccentric (Ecc) strength test. Methods: Thirty-three college male student-athletes were recruited to participate in this study. The participants first performed CMJs with the second consisting of one repetition maximum back squat (1RM-BS) test. CMJ and 1RM-BS tests were performed on twin force plates. Results: The CMJ had significant correlations with the Ecc peak force (EccPF), and Ecc mean force (EccMF) of 1RM-BS, respectively (r = 0.61\u20130.69). Moreover, all parameters had a coefficient of variation (CV) &lt; 10%. The intraclass correlation coefficient (ICC) values were moderate to excellent for each metric using the CMJ (0.94\u20130.97). The 1RM-BS and CMJ EccPF, EccMF Bland-Altman bias estimate variance ratio is 1.31\u20131.67, showing a moderate-large correlation in the Bland-Altman plot. Conclusions: CMJ ECC phase kinetics were associated with the 1RM-BS EccPF and EccMF. The CMJ can be an alternative tool for eccentric dynamic strength assessment.<\/jats:p>","DOI":"10.3390\/ijerph192316176","type":"journal-article","created":{"date-parts":[[2022,12,5]],"date-time":"2022-12-05T02:13:12Z","timestamp":1670206392000},"page":"16176","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Using the Countermovement Jump Metrics to Assess Dynamic Eccentric Strength: A Preliminary Study"],"prefix":"10.3390","volume":"19","author":[{"given":"Chien-Chun","family":"Chang","sequence":"first","affiliation":[{"name":"Graduate Institute of Athletics and Coaching Science, National Taiwan Sport University, Taoyuan 333, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chieh-Ying","family":"Chiang","sequence":"additional","affiliation":[{"name":"Department of Sports Training Science-Combats, National Taiwan Sport University, Taoyuan 333, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"McGuigan, M. 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