{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,5]],"date-time":"2026-11-05T16:27:09Z","timestamp":1793896029685,"version":"4.8.0"},"reference-count":49,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T00:00:00Z","timestamp":1784246400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100009013","name":"Jimei University","doi-asserted-by":"publisher","award":["JZ240034"],"award-info":[{"award-number":["JZ240034"]}],"id":[{"id":"10.13039\/501100009013","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100009013","name":"Jimei University","doi-asserted-by":"publisher","award":["Q202440"],"award-info":[{"award-number":["Q202440"]}],"id":[{"id":"10.13039\/501100009013","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100009013","name":"Jimei University","doi-asserted-by":"publisher","award":["231104575130151"],"award-info":[{"award-number":["231104575130151"]}],"id":[{"id":"10.13039\/501100009013","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100009013","name":"Jimei University","doi-asserted-by":"publisher","award":["FJ2025T011"],"award-info":[{"award-number":["FJ2025T011"]}],"id":[{"id":"10.13039\/501100009013","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Public Health"],"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To compare lower-extremity neuromuscular and biomechanical characteristics during single-leg drop landing under single-task and cognitive\u2013motor dual-task conditions in individuals with chronic ankle instability (CAI).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Twenty-three male participants with unilateral CAI completed single-leg drop landings from a 30-cm platform under single-task and auditory 2-back dual-task conditions in randomized order using a within-participant repeated-measures design. Whole-body three-dimensional kinematics, ground reaction force (GRF), and surface electromyographic (sEMG) signals from eight muscles of the affected limb were recorded synchronously. Outcomes included GRF and dynamic-stability measures, hip, knee, and ankle joint angles and internal moments, muscle activation, and co-contraction indices (CCIs). Depending on the distribution of paired differences, two-sided paired-samples\n                      <jats:italic>t<\/jats:italic>\n                      -tests or Wilcoxon signed-rank tests were used. Effect sizes were reported as Cohen's dz or rank-biserial correlations (rrb), respectively.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Compared with the single-task condition, the dual-task condition produced a higher peak vertical GRF (vGRF;\n                      <jats:italic>p<\/jats:italic>\n                      = 0.004, dz = 0.66) and smaller hip flexion angles at peak vGRF (\n                      <jats:italic>p<\/jats:italic>\n                      = 0.033, rrb = \u22120.507) and maximum knee flexion (\n                      <jats:italic>p<\/jats:italic>\n                      = 0.012, rrb = \u22120.587). At maximum knee flexion, the internal hip extension moment was lower (\n                      <jats:italic>p<\/jats:italic>\n                      &amp;lt; 0.001, dz = \u22120.80), whereas the internal ankle plantarflexion moment was higher (\n                      <jats:italic>p<\/jats:italic>\n                      = 0.028, dz = 0.49). The dual-task condition was also associated with lower lateral gastrocnemius root-mean-square activation (\n                      <jats:italic>p<\/jats:italic>\n                      = 0.002, dz = \u22120.75), higher peak tibialis anterior activation (\n                      <jats:italic>p<\/jats:italic>\n                      = 0.015, dz = 0.55), higher peak vastus lateralis activation (\n                      <jats:italic>p<\/jats:italic>\n                      = 0.001, dz = 0.77), and a lower peroneus longus\u2013medial gastrocnemius CCI (\n                      <jats:italic>p<\/jats:italic>\n                      = 0.030, dz = \u22120.48). No significant between-condition differences were observed in average vertical loading rate, time to stabilization, time to peak vGRF, hip flexion at initial contact, the measured knee and ankle joint angles, or frontal-plane joint angles.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>In individuals with CAI, a concurrent working-memory task was associated with higher peak impact, reduced hip flexion at selected post-contact events, and selective changes in net internal joint moments and lower-extremity sEMG measures. These findings indicate that dual-task effects on landing control are outcome- and event-specific rather than uniform across biomechanical and neuromuscular domains.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fpubh.2026.1912171","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T04:22:44Z","timestamp":1784262164000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Effects of a cognitive\u2013motor dual task on neuromuscular and biomechanical control during single-leg drop landing in individuals with chronic ankle instability"],"prefix":"10.3389","volume":"14","author":[{"given":"Yanzhi","family":"He","sequence":"first","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]},{"name":"Sports Science Research Institute, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zilong","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]},{"name":"Sports Science Research Institute, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenxin","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huizi","family":"Cui","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]},{"name":"Sports Science Research Institute, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bojun","family":"Zhou","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianming","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianfu","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pengfei","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Sports and Leisure, Dongshin University","place":["Naju, Republic of Korea"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ting","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Competitive Sports, Beijing Sport University","place":["Beijing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weipeng","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Strength and Conditioning, Shenyang Sport University","place":["Shenyang, Liaoning, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yixuan","family":"Lu","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Li","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuning","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaofu","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Physical Education, Jimei University","place":["Xiamen, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,7,17]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"232","DOI":"10.1016\/j.mporth.2016.04.015","article-title":"Biomechanics of the ankle","volume":"30","author":"Brockett","year":"2016","journal-title":"Orthop Trauma."},{"key":"B2","doi-asserted-by":"publisher","first-page":"603","DOI":"10.4085\/1062-6050-447-17","article-title":"Epidemiology of ankle sprains and chronic ankle instability","volume":"54","author":"Herzog","year":"2019","journal-title":"J Athl Train."},{"key":"B3","doi-asserted-by":"publisher","first-page":"572","DOI":"10.4085\/1062-6050-344-18","article-title":"An updated model of chronic ankle instability","volume":"54","author":"Hertel","year":"2019","journal-title":"J Athl Train."},{"key":"B4","doi-asserted-by":"publisher","first-page":"708","DOI":"10.4085\/1062-6050-483-17","article-title":"Altered movement biomechanics in chronic ankle instability, coper, and control groups: energy absorption and distribution implications","volume":"54","author":"Kim","year":"2019","journal-title":"J Athl Train."},{"key":"B5","first-page":"364","article-title":"Functional anatomy, pathomechanics, and pathophysiology of lateral ankle instability","volume":"37","author":"Hertel","year":"2002","journal-title":"J Athl Train."},{"key":"B6","doi-asserted-by":"publisher","first-page":"133","DOI":"10.4085\/1062-6050-46.2.133","article-title":"Chronic ankle instability: evolution of the model","volume":"46","author":"Hiller","year":"2011","journal-title":"J Athl Train."},{"key":"B7","doi-asserted-by":"publisher","first-page":"106036","DOI":"10.1016\/j.clinbiomech.2023.106036","article-title":"Inertial sensors-based assessment to detect hallmarks of chronic ankle instability during single-leg standing: is the healthy limb \u201chealthy\u201d?","volume":"107","author":"Deodato","year":"2023","journal-title":"Clin Biomech."},{"key":"B8","doi-asserted-by":"publisher","first-page":"182","DOI":"10.1016\/j.jshs.2020.09.014","article-title":"Chronic ankle instability is associated with proprioception deficits: a systematic review and meta-analysis","volume":"10","author":"Xue","year":"2021","journal-title":"J Sport Health Sci."},{"key":"B9","doi-asserted-by":"publisher","first-page":"1493","DOI":"10.1136\/bjsports-2016-096188","article-title":"2016 consensus statement of the International Ankle Consortium: prevalence, impact and long-term consequences of lateral ankle sprains","volume":"50","author":"Gribble","year":"2016","journal-title":"Br J Sports Med."},{"key":"B10","doi-asserted-by":"publisher","first-page":"116","DOI":"10.1080\/15438627.2020.1723099","article-title":"Males with chronic ankle instability demonstrate deficits in neurocognitive function compared to control and copers","volume":"29","author":"Rosen","year":"2021","journal-title":"Res Sports Med."},{"key":"B11","doi-asserted-by":"publisher","first-page":"814","DOI":"10.1186\/s12891-023-06944-3","article-title":"Effects of dual-task training on chronic ankle instability: a systematic review and meta-analysis","volume":"24","author":"Wang","year":"2023","journal-title":"BMC Musculoskeletal Disord."},{"key":"B12","doi-asserted-by":"publisher","first-page":"1991","DOI":"10.1002\/jor.20235","article-title":"Changes in lower limb kinematics, kinetics, and muscle activity in subjects with functional instability of the ankle joint during a single leg drop jump","volume":"24","author":"Delahunt","year":"2006","journal-title":"J Orthop Res."},{"key":"B13","doi-asserted-by":"publisher","first-page":"210","DOI":"10.1016\/j.ptsp.2018.06.003","article-title":"Individuals with chronic ankle instability exhibit dynamic postural stability deficits and altered unilateral landing biomechanics: a systematic review","volume":"37","author":"Simpson","year":"2019","journal-title":"Phys Ther Sport."},{"key":"B14","doi-asserted-by":"publisher","first-page":"1473844","DOI":"10.3389\/fphys.2024.1473844","article-title":"Effects of dual-task paradigm on the injury potential during landing among individuals with chronic ankle instability","volume":"15","author":"Zhong","year":"2024","journal-title":"Front Physiol"},{"key":"B15","doi-asserted-by":"publisher","first-page":"373","DOI":"10.52082\/jssm.2021.373","article-title":"Ankle instability patients exhibit altered muscle activation of lower extremity and ground reaction force during landing: a systematic review and meta-analysis","volume":"20","author":"Jeon","year":"2021","journal-title":"J Sports Sci Med."},{"key":"B16","doi-asserted-by":"publisher","first-page":"617","DOI":"10.1016\/j.clinbiomech.2004.03.001","article-title":"Changes in ground reaction force during jump landing in subjects with functional instability of the ankle joint","volume":"19","author":"Caulfield","year":"2004","journal-title":"Clin Biomech."},{"key":"B17","first-page":"653","article-title":"Are landing biomechanics altered in elite athletes with chronic ankle instability?","volume":"18","author":"Lin","year":"2019","journal-title":"J Sports Sci Med."},{"key":"B18","doi-asserted-by":"publisher","first-page":"11486","DOI":"10.1038\/s41598-022-15024-w","article-title":"Muscle function during single leg landing","volume":"12","author":"Maniar","year":"2022","journal-title":"Sci Rep."},{"key":"B19","doi-asserted-by":"publisher","first-page":"5130","DOI":"10.3390\/ijerph18105130","article-title":"Contribution of lower extremity joints on energy absorption during soft landing","volume":"18","author":"Tamura","year":"2021","journal-title":"Int J Environ Res Public Health."},{"key":"B20","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1016\/S0966-6362(01)00156-4","article-title":"Attention and the control of posture and gait: a review of an emerging area of research","volume":"16","author":"Woollacott","year":"2002","journal-title":"Gait Posture."},{"key":"B21","doi-asserted-by":"publisher","first-page":"249","DOI":"10.3928\/19425864-20200610-02","article-title":"Cognitive loading produces similar change in postural stability in patients with chronic ankle instability and controls","volume":"12","author":"McGrath","year":"2020","journal-title":"Athletic Train Sports Health Care."},{"key":"B22","doi-asserted-by":"publisher","first-page":"28","DOI":"10.1016\/j.gaitpost.2023.08.013","article-title":"Dual-task differences in individuals with chronic ankle instability: a systematic review with meta-analysis","volume":"106","author":"Choi","year":"2023","journal-title":"Gait Posture."},{"key":"B23","doi-asserted-by":"publisher","first-page":"10297","DOI":"10.3390\/app142210297","article-title":"Impact of cognitive tasks on biomechanical adjustments during single-leg drop landings in individuals with functional ankle instability","volume":"14","author":"Wang","year":"2024","journal-title":"Appl Sci."},{"key":"B24","doi-asserted-by":"publisher","first-page":"352","DOI":"10.1037\/h0043688","article-title":"Age differences in short-term retention of rapidly changing information","volume":"55","author":"Kirchner","year":"1958","journal-title":"J Exp Psychol."},{"key":"B25","doi-asserted-by":"publisher","first-page":"175","DOI":"10.3758\/BF03193146","article-title":"G*Power 3: a flexible statistical power analysis program for the social, behavioral, and biomedical sciences","volume":"39","author":"Faul","year":"2007","journal-title":"Behav Res Methods."},{"key":"B26","doi-asserted-by":"publisher","first-page":"1149","DOI":"10.3758\/BRM.41.4.1149","article-title":"Statistical power analyses using G*Power 3.1: tests for correlation and regression analyses","volume":"41","author":"Faul","year":"2009","journal-title":"Behav Res Methods"},{"key":"B27","doi-asserted-by":"publisher","first-page":"863","DOI":"10.3389\/fpsyg.2013.00863","article-title":"Calculating and reporting effect sizes to facilitate cumulative science: a practical primer for t-tests and ANOVAs","volume":"4","author":"Lakens","year":"2013","journal-title":"Front Psychol."},{"key":"B28","doi-asserted-by":"publisher","first-page":"71","DOI":"10.1001\/jama.2024.21972","article-title":"World Medical Association Declaration of Helsinki: ethical principles for medical research involving human participants","volume":"333","year":"2025","journal-title":"JAMA."},{"key":"B29","doi-asserted-by":"publisher","first-page":"110027","DOI":"10.1016\/j.gaitpost.2025.110027","article-title":"Investigation on the effects of mental fatigue on drop landing motion control in individuals with functional ankle instability: a biomechanical perspective","volume":"124","author":"Wang","year":"2025","journal-title":"Gait Posture."},{"key":"B30","doi-asserted-by":"publisher","first-page":"695","DOI":"10.1111\/j.1532-5415.2005.53221.x","article-title":"The montreal cognitive assessment, MoCA: a brief screening tool for mild cognitive impairment","volume":"53","author":"Nasreddine","year":"2005","journal-title":"J Am Geriatr Soc."},{"key":"B31","doi-asserted-by":"publisher","first-page":"274","DOI":"10.1177\/0363546506294470","article-title":"Relationship of chronic ankle instability to muscle activation patterns during the transition from double-leg to single-leg stance","volume":"35","author":"Van Deun","year":"2007","journal-title":"Am J Sports Med."},{"key":"B32","doi-asserted-by":"publisher","first-page":"361","DOI":"10.1016\/S1050-6411(00)00027-4","article-title":"Development of recommendations for SEMG sensors and sensor placement procedures","volume":"10","author":"Hermens","year":"2000","journal-title":"J Electromyogr Kinesiol."},{"key":"B33","doi-asserted-by":"publisher","first-page":"1573","DOI":"10.1016\/j.jbiomech.2010.01.027","article-title":"Filtering the surface EMG signal: movement artifact and baseline noise contamination","volume":"43","author":"De Luca","year":"2010","journal-title":"J Biomech."},{"key":"B34","doi-asserted-by":"publisher","first-page":"1023","DOI":"10.1016\/j.jelekin.2010.07.004","article-title":"How should we normalize electromyograms obtained from healthy participants? What we have learned from over 25 years of research","volume":"20","author":"Burden","year":"2010","journal-title":"J Electromyogr Kinesiol."},{"key":"B35","doi-asserted-by":"publisher","first-page":"1579260","DOI":"10.3389\/fnhum.2025.1579260","article-title":"Effects of auditory rhythmic adaptation on lower limb joint mechanics during single-leg drop landings in individuals with functional ankle instability","volume":"19","author":"Meng","year":"2025","journal-title":"Front Hum Neurosci"},{"key":"B36","doi-asserted-by":"publisher","first-page":"666","DOI":"10.1016\/j.jbiomech.2011.12.011","article-title":"Effect of low pass filtering on joint moments from inverse dynamics: implications for injury prevention","volume":"45","author":"Kristianslund","year":"2012","journal-title":"J Biomech."},{"key":"B37","doi-asserted-by":"publisher","first-page":"804","DOI":"10.1123\/jab.29.6.804","article-title":"Filtering ground reaction force data affects the calculation and interpretation of joint kinetics and energetics during drop landings","volume":"29","author":"McCaw","year":"2013","journal-title":"J Appl Biomech."},{"key":"B38","doi-asserted-by":"publisher","first-page":"17855","DOI":"10.1038\/s41598-026-50165-2","article-title":"The impact of mental fatigue on drop landing injury risk and lower limb asymmetry in elite collegiate American football players","volume":"16","author":"Wang","year":"2026","journal-title":"Sci Rep."},{"key":"B39","doi-asserted-by":"publisher","first-page":"63","DOI":"10.1016\/j.gaitpost.2014.08.018","article-title":"Time to stabilization in single leg drop jump landings: an examination of calculation methods and assessment of differences in sample rate, filter settings and trial length on outcome values","volume":"41","author":"Fransz","year":"2015","journal-title":"Gait Posture."},{"key":"B40","doi-asserted-by":"publisher","first-page":"591","DOI":"10.1093\/biomet\/52.3-4.591","article-title":"An analysis of variance test for normality (complete samples)","volume":"52","author":"Shapiro","year":"1965","journal-title":"Biometrika."},{"key":"B41","doi-asserted-by":"publisher","first-page":"95","DOI":"10.1016\/j.gaitpost.2016.05.004","article-title":"Cognitive loading-induced sway alterations are similar in those with chronic ankle instability and uninjured controls","volume":"48","author":"Burcal","year":"2016","journal-title":"Gait Posture."},{"key":"B42","doi-asserted-by":"publisher","first-page":"297","DOI":"10.1016\/j.clinbiomech.2005.11.003","article-title":"Lower extremity biomechanics during the landing of a stop-jump task","volume":"21","author":"Yu","year":"2006","journal-title":"Clin Biomech."},{"key":"B43","doi-asserted-by":"publisher","first-page":"585","DOI":"10.1016\/j.clinbiomech.2015.04.001","article-title":"Multi-segmented foot landing kinematics in subjects with chronic ankle instability","volume":"30","author":"De Ridder","year":"2015","journal-title":"Clin Biomech."},{"key":"B44","doi-asserted-by":"publisher","first-page":"602","DOI":"10.1016\/j.pmrj.2013.12.013","article-title":"Lower extremity muscle activation during functional exercises in patients with and without chronic ankle instability","volume":"6","author":"Feger","year":"2014","journal-title":"PM&R."},{"key":"B45","doi-asserted-by":"publisher","first-page":"189","DOI":"10.1123\/jsr.13.3.189","article-title":"Altered ankle-muscle activation during jump landing in participants with functional instability of the ankle joint","volume":"13","author":"Caulfield","year":"2004","journal-title":"J Sport Rehabil."},{"key":"B46","volume-title":"Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation","author":"Neumann","year":"2017"},{"key":"B47","first-page":"135","article-title":"Quantitative assessment of co-contraction at the ankle joint in walking","volume":"25","author":"Falconer","year":"1985","journal-title":"Electromyogr Clin Neurophysiol."},{"key":"B48","doi-asserted-by":"publisher","first-page":"1318","DOI":"10.1109\/TNSRE.2026.3667526","article-title":"Enhanced identification of chronic ankle instability under different conditions: a new evaluation framework based on feature fusion and machine learning","volume":"34","author":"Zhou","year":"2026","journal-title":"IEEE Trans Neural Syst Rehabil Engi"},{"key":"B49","doi-asserted-by":"publisher","first-page":"625304","DOI":"10.1007\/s10409-025-25304-x","article-title":"Data-driven computing ligament loading mechanisms: integration of the computational ligament mechanics models with deep learning","volume":"42","author":"Xu","year":"2026","journal-title":"Acta Mech Sin."}],"container-title":["Frontiers in Public Health"],"original-title":[],"link":[{"URL":"https:\/\/www.frontiersin.org\/articles\/10.3389\/fpubh.2026.1912171\/full","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,11,5]],"date-time":"2026-11-05T15:59:17Z","timestamp":1793894357000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.frontiersin.org\/articles\/10.3389\/fpubh.2026.1912171\/full"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,7,17]]},"references-count":49,"alternative-id":["10.3389\/fpubh.2026.1912171"],"URL":"https:\/\/doi.org\/10.3389\/fpubh.2026.1912171","relation":{},"ISSN":["2296-2565"],"issn-type":[{"value":"2296-2565","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,7,17]]},"article-number":"1912171"}}