{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T16:45:58Z","timestamp":1790959558744,"version":"4.1.0"},"reference-count":33,"publisher":"Human Kinetics","issue":"8","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,8,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> This study investigated lower-limb asymmetry in speed climbers and its relationship with climbing time while exploring the underlying mechanisms through muscle-thickness and activation. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Nineteen speed climbers completed muscle-thickness measurements, single-leg countermovement-jump tests, and speed-climbing tests. Muscle thickness was assessed using ultrasound, single-leg countermovement-jump tests were performed on a force platform, and climbing tests were conducted on a standardized climbing wall. Data were used to calculate muscle thickness, peak force (<jats:italic>F<\/jats:italic><jats:sub>peak<\/jats:sub>), rate of force development, and integrated electromyography [EMG] percentage (iEMG %). Correlation analysis assessed the relationship between lower-limb asymmetry and climbing time, while paired <jats:italic>t<\/jats:italic> tests and asymmetry indices were used to analyze differences and asymmetry levels. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Results showed significant positive correlations between climbing time and asymmetry indices of <jats:italic>F<\/jats:italic><jats:sub>peak<\/jats:sub> (<jats:italic>r<\/jats:italic>\u2009=\u2009.57, <jats:italic>P<\/jats:italic>\u2009=\u2009.028) and rate of force development (<jats:italic>r<\/jats:italic>\u2009=\u2009.52, <jats:italic>P<\/jats:italic>\u2009=\u2009.045). No significant differences were observed in <jats:italic>F<\/jats:italic><jats:sub>peak<\/jats:sub>, rate of force development, muscle thickness, iEMG (%) during jumping, or iEMG (%) of the biceps brachii and medial gastrocnemius during climbing (<jats:italic>P<\/jats:italic>\u2009&gt;\u2009.05). However, significant differences were found in rectus femoris iEMG (%) during climbing (<jats:italic>P<\/jats:italic>\u2009=\u2009.028, <jats:italic>d<\/jats:italic>\u2009=\u20090.89). Most asymmetry indices, except for <jats:italic>F<\/jats:italic><jats:sub>peak<\/jats:sub>, muscle thickness, and iEMG (%) of the biceps brachii and medial gastrocnemius, exceeded 15%, indicating high asymmetry levels. <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> This study highlights significant lower-limb asymmetry in speed climbers, potentially affecting performance. Findings suggest neural-activation differences, rather than muscle thickness, as the primary contributors. Regular monitoring and targeted interventions are recommended to reduce asymmetry and its impact on performance.<\/jats:p>","DOI":"10.1123\/ijspp.2025-0052","type":"journal-article","created":{"date-parts":[[2025,6,28]],"date-time":"2025-06-28T13:20:38Z","timestamp":1751116838000},"page":"1161-1167","source":"Crossref","is-referenced-by-count":5,"title":["The Relationship Between Lower-Limb Asymmetry and Speed-Climbing Time: The Role of Muscle Thickness and Neural Activation"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-5892-2220","authenticated-orcid":true,"given":"Xiaocong","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Leisure Sports, School of Wushu, Chengdu Sport University, Chengdu, SC, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changhua","family":"Zhu","sequence":"additional","affiliation":[{"name":"School of Leisure Sports, Chengdu Sport University, Chengdu, SC, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyong","family":"Ou","sequence":"additional","affiliation":[{"name":"School of Leisure Sports, Chengdu Sport University, Chengdu, SC, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lijuan","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Leisure and Sports, Gingko College of Hospitality Management, Chengdu, SC, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-3553-6932","authenticated-orcid":true,"given":"Ming","family":"Li","sequence":"additional","affiliation":[{"name":"College of Education and Sports Sciences, Yangtze University, Jingzhou, HUB, China"},{"name":"Newbiolab Sports Science Laboratory, Chengdu, SC, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"issue":"4","key":"r1","series-title":"Scand J Med Sci Sports","doi-asserted-by":"publisher","first-page":"406","DOI":"10.1111\/j.1600-0838.2011.01399.x","article-title":"Work-relief ratios and imbalances of load application in sport climbing: another link to overuse-induced injuries?","volume":"23","author":"Donath L","year":"2013","unstructured":"Donath L, Roesner K, Sch\u00f6ffl V, Gabriel HHW. 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