{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T02:04:56Z","timestamp":1760234696094,"version":"build-2065373602"},"reference-count":30,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2021,6,1]],"date-time":"2021-06-01T00:00:00Z","timestamp":1622505600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Science and Technology, ROC","award":["MOST-105-2815-C-259-015-H"],"award-info":[{"award-number":["MOST-105-2815-C-259-015-H"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>Side-to-side asymmetry of lower extremities may influence the risk of injury associated with drop jump. Moreover, drop heights using relative height across individuals based on respective jumping abilities could better explain lower-extremity loading impact for different genders. The purpose of the current study was to evaluate the sex differences of impact forces and asymmetry during the landing phase of drop-jump tasks using drop heights, set according to participants\u2019 maximum jumping height. Ten male and ten female athletes performed drop-jump tasks on two force plates, and ground reaction force data were collected. Both feet needed to land entirely on the dedicated force plates as simultaneously as possible. Ground reaction forces and asymmetry between legs were calculated for jumps from 100%, 130%, and 160% of each participant\u2019s maximum jumping height. Females landed with greater asymmetry at time of contact initiation and time of peak impact force and had more asymmetrical peak impact force than males. Greater values and shorter time after ground contact of peak impact force were found when the drop height increased to 160% of maximum jumping ability as compared to 100% and 130%. Females exhibited greater asymmetry than males during drop jumps from relative heights, which may relate to the higher risk of anterior cruciate ligament injury among females. Greater sex disparity was evident in impact force asymmetry than in the magnitude of peak impact force; therefore, it may be a more appropriate field-screening test for risk of anterior cruciate ligament injury.<\/jats:p>","DOI":"10.3390\/ijerph18115953","type":"journal-article","created":{"date-parts":[[2021,6,1]],"date-time":"2021-06-01T15:58:44Z","timestamp":1622563124000},"page":"5953","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Sex Disparity in Bilateral Asymmetry of Impact Forces during Height-Adjusted Drop Jumps"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1203-7850","authenticated-orcid":false,"given":"Chin-Yi","family":"Gu","sequence":"first","affiliation":[{"name":"Department of Education and Human Potentials Development, National Dong Hwa University, No. 1, Sec. 2, Da Hsueh Rd., Shoufeng, Hualien 97401, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiang-Rui","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Kinesiology, National Dong Hwa University, No. 1, Sec. 2, Da Hsueh Rd., Shoufeng, Hualien 97401, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chien-Ting","family":"Lai","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Kinesiology, National Dong Hwa University, No. 1, Sec. 2, Da Hsueh Rd., Shoufeng, Hualien 97401, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jin-Jiang","family":"Gao","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Kinesiology, National Dong Hwa University, No. 1, Sec. 2, Da Hsueh Rd., Shoufeng, Hualien 97401, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6234-3768","authenticated-orcid":false,"given":"I-Lin","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Physical Education, Hubei Normal University, Huangshi 435002, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5733-5002","authenticated-orcid":false,"given":"Li-I","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Physical Education and Kinesiology, National Dong Hwa University, No. 1, Sec. 2, Da Hsueh Rd., Shoufeng, Hualien 97401, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"694","DOI":"10.1177\/036354659502300611","article-title":"Knee injury patterns among men and women in collegiate basketball and soccer: NCAA data and review of literature","volume":"23","author":"Arendt","year":"1995","journal-title":"Am. J. Sports Med."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"416","DOI":"10.1002\/jor.20056","article-title":"Gender differences in hip adduction motion and torque during a single-leg agility maneuver","volume":"24","author":"Hewett","year":"2006","journal-title":"J. Orthop. Res."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"87","DOI":"10.1016\/j.jsams.2011.07.008","article-title":"Lower extremity kinematic asymmetry in male and female athletes performing jump-landing tasks","volume":"15","author":"Pappas","year":"2012","journal-title":"J. Sci. Med. Sport"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"622","DOI":"10.1016\/j.clinbiomech.2004.03.006","article-title":"Comparison of landing maneuvers between male and female college volleyball players","volume":"19","author":"Salci","year":"2004","journal-title":"Clin. Biomech."},{"key":"ref_5","first-page":"67","article-title":"Differences in neuromuscular strategies between landing and cutting tasks in female basketball and soccer athletes","volume":"41","author":"Cowley","year":"2006","journal-title":"J. Athl. Train."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"492","DOI":"10.1177\/0363546504269591","article-title":"Biomechanical measures of neuromuscular control and valgus loading of the knee predict anterior cruciate ligament injury risk in female athletes: A prospective study","volume":"33","author":"Hewett","year":"2005","journal-title":"Am. J. Sports Med."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1237","DOI":"10.1016\/j.jbiomech.2013.02.024","article-title":"Impact differences in ground reaction force and center of mass between the first and second landing phases of a drop vertical jump and their implications for injury risk assessment","volume":"46","author":"Bates","year":"2013","journal-title":"J. Biomech."},{"key":"ref_8","first-page":"339","article-title":"Drop jumping. II. The influence of dropping height on the biomechanics of drop jumping","volume":"19","author":"Bobbert","year":"1987","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_9","first-page":"522","article-title":"Biomechanical comparisons of single-and double-legged drop jumps with changes in drop height","volume":"35","author":"Wang","year":"2014","journal-title":"Int. J. Sports Med."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"2510","DOI":"10.1519\/JSC.0b013e318201bcb3","article-title":"Changes in biomechanical properties during drop jumps of incremental height","volume":"25","author":"Peng","year":"2011","journal-title":"J. Strength Cond. Res."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"553","DOI":"10.2519\/jospt.2011.3591","article-title":"Effects of sex on compensatory landing strategies upon return to sport after anterior cruciate ligament reconstruction","volume":"41","author":"Paterno","year":"2011","journal-title":"J. Orthop. Sports Phys. Ther."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"2762","DOI":"10.1519\/JSC.0b013e3181cc2408","article-title":"Bilateral contact ground reaction forces and contact times during plyometric drop jumping","volume":"24","author":"Ball","year":"2010","journal-title":"J. Strength Cond. Res."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"56","DOI":"10.1016\/j.ptsp.2009.11.004","article-title":"Drop jump landing knee valgus angle; normative data in a physically active population","volume":"11","author":"Herrington","year":"2010","journal-title":"Phys. Ther. Sport"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"404","DOI":"10.1080\/14763141.2015.1062129","article-title":"Sex differences in lower extremity stiffness and kinematics alterations during double-legged drop landings with changes in drop height","volume":"14","author":"Wang","year":"2015","journal-title":"Sports Biomech."},{"key":"ref_15","first-page":"261","article-title":"Utilization of stored elastic energy in leg extensor muscles by men and women","volume":"10","author":"Komi","year":"1978","journal-title":"Med. Sci. Sports"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"298","DOI":"10.1016\/j.knee.2015.03.012","article-title":"Sex differences in unilateral landing mechanics from absolute and relative heights","volume":"22","author":"Weinhandl","year":"2015","journal-title":"Knee"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"166","DOI":"10.1080\/02640414.2016.1159716","article-title":"Influence of sex and limb dominance on lower extremity joint mechanics during unilateral land-and-cut manoeuvres","volume":"35","author":"Weinhandl","year":"2017","journal-title":"J. Sports Sci."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"444","DOI":"10.1123\/jab.26.4.444","article-title":"Gender comparisons between unilateral and bilateral landings","volume":"26","author":"Weinhandl","year":"2010","journal-title":"J. Appl. Biomech."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2191","DOI":"10.1001\/jama.2013.281053","article-title":"World Medical Association Declaration of Helsinki: Ethical principles for medical research involving human subjects","volume":"310","author":"Association","year":"2013","journal-title":"JAMA"},{"key":"ref_20","first-page":"1687814019849794","article-title":"Asymmetry between the dominant and non-dominant legs in the lower limb biomechanics during single-leg landings in females","volume":"11","author":"Wang","year":"2019","journal-title":"Adv. Mech. Eng."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1433","DOI":"10.1519\/JSC.0b013e3181a4e97f","article-title":"Bilateral neuromuscular and force differences during a plyometric task","volume":"23","author":"Ball","year":"2009","journal-title":"J. Strength Cond. Res."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Huang, Y.-P., Peng, H.-T., Wang, X., Chen, Z.-R., and Song, C.-Y. (2020). The arch support insoles show benefits to people with flatfoot on stance time, cadence, plantar pressure and contact area. PLoS ONE, 15.","DOI":"10.1371\/journal.pone.0237382"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"2476","DOI":"10.1519\/JSC.0000000000001358","article-title":"Whole body vibration immediately decreases lower extremity loading during the drop jump","volume":"30","author":"Chen","year":"2016","journal-title":"J. Strength Cond. Res."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"i47","DOI":"10.1136\/bjsm.2007.037192","article-title":"Mechanisms of non-contact ACL injuries","volume":"41","author":"Yu","year":"2007","journal-title":"Br. J. Sports Med."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"15","DOI":"10.14198\/jhse.2015.101.02","article-title":"Effect of plyometric training on athletic performance in preadolescent soccer players","volume":"10","author":"Michailidis","year":"2015","journal-title":"J. Hum. Sport Exerc."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"765","DOI":"10.1177\/036354659602400611","article-title":"Plyometric training in female athletes: Decreased impact forces and increased hamstring torques","volume":"24","author":"Hewett","year":"1996","journal-title":"Am. J. Sports Med."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"258","DOI":"10.1097\/JSM.0b013e31804c77ea","article-title":"Limb asymmetries in landing and jumping 2 years following anterior cruciate ligament reconstruction","volume":"17","author":"Paterno","year":"2007","journal-title":"Clin. J. Sport Med."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"181","DOI":"10.1016\/j.humov.2005.11.007","article-title":"Human bilateral deficit during a dynamic multi-joint leg press movement","volume":"25","author":"Hay","year":"2006","journal-title":"Hum. Mov. Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"857","DOI":"10.1113\/expphysiol.1998.sp004165","article-title":"The control of timing and amplitude of EMG activity in landing movements in humans","volume":"83","author":"Santello","year":"1998","journal-title":"Exp. Physiol. Transl. Integr."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1136\/bjsm.27.4.260","article-title":"Left-right asymmetry in two types of soccer kick","volume":"27","author":"McLean","year":"1993","journal-title":"Br. J. Sports Med."}],"container-title":["International Journal of Environmental Research and Public Health"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1660-4601\/18\/11\/5953\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:09:58Z","timestamp":1760162998000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1660-4601\/18\/11\/5953"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,6,1]]},"references-count":30,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2021,6]]}},"alternative-id":["ijerph18115953"],"URL":"https:\/\/doi.org\/10.3390\/ijerph18115953","relation":{},"ISSN":["1660-4601"],"issn-type":[{"type":"electronic","value":"1660-4601"}],"subject":[],"published":{"date-parts":[[2021,6,1]]}}}