{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T03:18:18Z","timestamp":1785381498115,"version":"3.55.0"},"reference-count":57,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2024,2,10]],"date-time":"2024-02-10T00:00:00Z","timestamp":1707523200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Fondazione Ariel"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Bioengineering"],"abstract":"<jats:p>Four to five muscle synergies account for children\u2019s locomotion and appear to be consistent across alterations in speed and slopes. Backpack carriage induces alterations in gait kinematics in healthy children, raising questions regarding the clinical consequences related to orthopedic and neurological diseases and ergonomics. However, to support clinical decisions and characterize backpack carriage, muscle synergies can help with understanding the alterations induced in this condition at the motor control level. In this study, we investigated how children adjust the recruitment of motor patterns during locomotion, when greater muscular demands are required (backpack carriage). Twenty healthy male children underwent an instrumental gait analysis and muscle synergies extraction during three walking conditions: self-selected, fast and load conditions. In the fast condition, a reduction in the number of synergies (three to four) was needed for reconstructing the EMG signal with the same accuracy as in the other conditions (three to five). Synergies were grouped in only four clusters in the fast condition, while five clusters were needed for the self-selected condition. The right number of clusters was not clearly identified in the load condition. Speed and backpack carriage altered nearly every spatial\u2013temporal parameter of gait, whereas kinematic alterations reflected mainly hip and pelvis adaptations. Although the synergistic patterns were consistent across conditions, indicating a similar motor pattern in different conditions, the fast condition required fewer synergies for reconstructing the EMG signal with the same level of accuracy.<\/jats:p>","DOI":"10.3390\/bioengineering11020173","type":"journal-article","created":{"date-parts":[[2024,2,12]],"date-time":"2024-02-12T03:50:27Z","timestamp":1707709827000},"page":"173","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Influence of Backpack Carriage and Walking Speed on Muscle Synergies in Healthy Children"],"prefix":"10.3390","volume":"11","author":[{"given":"Giorgia","family":"Marino","sequence":"first","affiliation":[{"name":"Physiotherapy Unit, IRCCS Humanitas Research Hospital, via Manzoni 56, Rozzano, 20098 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1896-9325","authenticated-orcid":false,"given":"Alessandro","family":"Scano","sequence":"additional","affiliation":[{"name":"Institute of Intelligent Industrial Systems and Technologies for Advanced Manufacturing (STIIMA), Italian Council of National Research (CNR), 00187 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giulia","family":"Beltrame","sequence":"additional","affiliation":[{"name":"Residency Program in Orthopedics and Traumatology, Universit\u00e1 degli Studi di Milano, 20126 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3201-8315","authenticated-orcid":false,"given":"Cristina","family":"Brambilla","sequence":"additional","affiliation":[{"name":"Institute of Intelligent Industrial Systems and Technologies for Advanced Manufacturing (STIIMA), Italian Council of National Research (CNR), 00187 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessandro","family":"Marazzi","sequence":"additional","affiliation":[{"name":"Department of Biomedical Sciences, Humanitas University, via Rita Levi Montalcini 4, Pieve Emanuele, 20072 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco","family":"Aparo","sequence":"additional","affiliation":[{"name":"Department of Biomedical Sciences, Humanitas University, via Rita Levi Montalcini 4, Pieve Emanuele, 20072 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lorenzo","family":"Molinari Tosatti","sequence":"additional","affiliation":[{"name":"Institute of Intelligent Industrial Systems and Technologies for Advanced Manufacturing (STIIMA), Italian Council of National Research (CNR), 00187 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto","family":"Gatti","sequence":"additional","affiliation":[{"name":"Physiotherapy Unit, IRCCS Humanitas Research Hospital, via Manzoni 56, Rozzano, 20098 Milan, Italy"},{"name":"Department of Biomedical Sciences, Humanitas University, via Rita Levi Montalcini 4, Pieve Emanuele, 20072 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicola","family":"Portinaro","sequence":"additional","affiliation":[{"name":"Residency Program in Orthopedics and Traumatology, Universit\u00e1 degli Studi di Milano, 20126 Milan, Italy"},{"name":"Department of Pediatric Surgery, Fondazione IRCCS Ca\u2019 Granda, Ospedale Maggiore Policlinico, 20122 Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,2,10]]},"reference":[{"key":"ref_1","unstructured":"Bernstein, N. (1967). The Co-Ordination and Regulation of Movements, Pergamon Press."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"6419","DOI":"10.1523\/JNEUROSCI.4904-04.2005","article-title":"Central and Sensory Contributions to the Activation and Organization of Muscle Synergies during Natural Motor Behaviors","volume":"25","author":"Cheung","year":"2005","journal-title":"J. Neurosci."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"300","DOI":"10.1038\/nn1010","article-title":"Combinations of Muscle Synergies in the Construction of a Natural Motor Behavior","volume":"6","author":"Saltiel","year":"2003","journal-title":"Nat. Neurosci."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"3426","DOI":"10.1152\/jn.00081.2006","article-title":"Motor Patterns in Human Walking and Running","volume":"95","author":"Cappellini","year":"2006","journal-title":"J. Neurophysiol."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"267","DOI":"10.1113\/jphysiol.2003.057174","article-title":"Five Basic Muscle Activation Patterns Account for Muscle Activity during Human Locomotion: Basic Muscle Activation Patterns","volume":"556","author":"Ivanenko","year":"2004","journal-title":"J. Physiol."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"7238","DOI":"10.1523\/JNEUROSCI.1327-05.2005","article-title":"Coordination of Locomotion with Voluntary Movements in Humans","volume":"25","author":"Ivanenko","year":"2005","journal-title":"J. Neurosci."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"997","DOI":"10.1126\/science.1210617","article-title":"Locomotor Primitives in Newborn Babies and Their Development","volume":"334","author":"Dominici","year":"2011","journal-title":"Science"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"844","DOI":"10.1152\/jn.00825.2009","article-title":"Merging of Healthy Motor Modules Predicts Reduced Locomotor Performance and Muscle Coordination Complexity Post-Stroke","volume":"103","author":"Clark","year":"2010","journal-title":"J. Neurophysiol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"12237","DOI":"10.1523\/JNEUROSCI.6344-11.2012","article-title":"Voluntary and Reactive Recruitment of Locomotor Muscle Synergies during Perturbed Walking","volume":"32","author":"Chvatal","year":"2012","journal-title":"J. Neurosci."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1016\/j.jelekin.2016.07.010","article-title":"Influence of Locomotion Speed on Biomechanical Subtask and Muscle Synergy","volume":"30","author":"Gui","year":"2016","journal-title":"J. Electromyogr. Kinesiol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1239","DOI":"10.1113\/jphysiol.2007.146605","article-title":"Muscle Synergies during Locomotion in the Cat: A Model for Motor Cortex Control: Cortical Control of Locomotion","volume":"586","author":"Drew","year":"2008","journal-title":"J. Physiol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"622","DOI":"10.1016\/j.conb.2008.01.002","article-title":"Neuromechanics of Muscle Synergies for Posture and Movement","volume":"17","author":"Ting","year":"2007","journal-title":"Curr. Opin. Neurobiol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1016\/j.jbiomech.2017.09.002","article-title":"Muscle Synergies Are Similar When Typically Developing Children Walk on a Treadmill at Different Speeds and Slopes","volume":"64","author":"Rozumalski","year":"2017","journal-title":"J. Biomech."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1984","DOI":"10.1152\/jn.00220.2014","article-title":"Shared Muscle Synergies in Human Walking and Cycling","volume":"112","author":"Barroso","year":"2014","journal-title":"J. Neurophysiol."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3364","DOI":"10.1038\/s41598-019-40076-w","article-title":"The Effects of Backpack Carriage on Gait Kinematics and Kinetics of Schoolchildren","volume":"9","author":"Ahmad","year":"2019","journal-title":"Sci. Rep."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"642","DOI":"10.1080\/00140130500070921","article-title":"The Effect of Backpack Load on the Gait of Normal Adolescent Girls","volume":"48","author":"Chow","year":"2005","journal-title":"Ergonomics"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"12192","DOI":"10.1038\/s41598-019-48675-3","article-title":"Variation of Spatiotemporal Parameters in School Children Carrying Different Backpack Loads: A Cross Sectional Study","volume":"9","author":"Evans","year":"2019","journal-title":"Sci. Rep."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"253","DOI":"10.3233\/WOR-192926","article-title":"Gait Asymmetry and Rating of Perceived Exertion: How Are They Influenced by Carrying a Backpack and Pulling a Trolley?","volume":"63","year":"2019","journal-title":"Work"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/S0966-6362(02)00050-4","article-title":"Gait and Posture Responses to Backpack Load during Level Walking in Children","volume":"17","author":"Hong","year":"2003","journal-title":"Gait Posture"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1186\/s13643-019-1063-z","article-title":"Effects of Walking Speed on Gait Biomechanics in Healthy Participants: A Systematic Review and Meta-Analysis","volume":"8","author":"Fukuchi","year":"2019","journal-title":"Syst. Rev."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1639","DOI":"10.1016\/j.jbiomech.2008.03.015","article-title":"The Effect of Walking Speed on the Gait of Typically Developing Children","volume":"41","author":"Schwartz","year":"2008","journal-title":"J. Biomech."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/j.apergo.2019.05.003","article-title":"A Kinematic Comparison of Gait with a Backpack versus a Trolley for Load Carriage in Children","volume":"80","author":"Robinson","year":"2019","journal-title":"Appl. Ergon."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"728","DOI":"10.1080\/00140130701194850","article-title":"Evaluation of the Effect of Backpack Load and Position during Standing and Walking Using Biomechanical, Physiological and Subjective Measures","volume":"50","author":"Devroey","year":"2007","journal-title":"Ergonomics"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/j.gaitpost.2005.08.007","article-title":"The Effect of Backpack Weight on the Standing Posture and Balance of Schoolgirls with Adolescent Idiopathic Scoliosis and Normal Controls","volume":"24","author":"Chow","year":"2006","journal-title":"Gait Posture"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"872","DOI":"10.1080\/00140139.2010.489965","article-title":"Postural Sway Modifications Induced by Backpack Carriage in Primary School Children: A Case Study in Italy","volume":"53","author":"Pau","year":"2010","journal-title":"Ergonomics"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"402","DOI":"10.1016\/j.gaitpost.2011.06.010","article-title":"Temporal Relationship between Trunk and Thigh Contributes to Balance Control in Load Carriage Walking","volume":"34","author":"Yen","year":"2011","journal-title":"Gait Posture"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"2522","DOI":"10.1016\/j.jbiomech.2013.06.020","article-title":"Men and Women Adopt Similar Walking Mechanics and Muscle Activation Patterns during Load Carriage","volume":"46","author":"Silder","year":"2013","journal-title":"J. Biomech."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"782","DOI":"10.1016\/j.jelekin.2011.05.012","article-title":"Backpack Load Affects Lower Limb Muscle Activity Patterns of Female Hikers during Prolonged Load Carriage","volume":"21","author":"Simpson","year":"2011","journal-title":"J. Electromyogr. Kinesiol."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"990","DOI":"10.1016\/j.jelekin.2007.06.013","article-title":"Effect of Prolonged Walking with Backpack Loads on Trunk Muscle Activity and Fatigue in Children","volume":"18","author":"Hong","year":"2008","journal-title":"J. Electromyogr. Kinesiol."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/j.gaitpost.2008.06.006","article-title":"Effects of Backpack Load Position on Spatiotemporal Parameters and Trunk Forward Lean","volume":"29","author":"Singh","year":"2009","journal-title":"Gait Posture"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"87","DOI":"10.1016\/S0304-3959(02)00008-8","article-title":"Low Back Pain in Schoolchildren: Occurrence and Characteristics","volume":"97","author":"Watson","year":"2002","journal-title":"Pain"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"468","DOI":"10.1097\/01.brs.0000199958.04073.d9","article-title":"The Course of Low Back Pain From Adolescence to Adulthood: Eight-Year Follow-up of 9600 Twins","volume":"31","author":"Hestbaek","year":"2006","journal-title":"Spine"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Chen, Y.-L., and Mu, Y.-C. (2018). Effects of Backpack Load and Position on Body Strains in Male Schoolchildren While Walking. PLoS ONE, 13.","DOI":"10.1371\/journal.pone.0193648"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"614","DOI":"10.1123\/jab.2015-0339","article-title":"The Effect of Backpack Carriage on the Biomechanics of Walking: A Systematic Review and Preliminary Meta-Analysis","volume":"32","author":"Liew","year":"2016","journal-title":"J. Appl. Biomech."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"646","DOI":"10.1016\/j.jsams.2010.03.006","article-title":"Comparison of Methods for Kinematic Identification of Footstrike and Toe-off during Overground and Treadmill Running","volume":"13","author":"Fellin","year":"2010","journal-title":"J. Sci. Med. Sport"},{"key":"ref_36","doi-asserted-by":"crossref","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":"ref_37","doi-asserted-by":"crossref","first-page":"788","DOI":"10.1038\/44565","article-title":"Learning the Parts of Objects by Non-Negative Matrix Factorization","volume":"401","author":"Lee","year":"1999","journal-title":"Nature"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"7791","DOI":"10.1523\/JNEUROSCI.0830-06.2006","article-title":"Control of Fast-Reaching Movements by Muscle Synergy Combinations","volume":"26","author":"Portone","year":"2006","journal-title":"J. Neurosci."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"178","DOI":"10.1016\/j.ins.2022.11.139","article-title":"K-Means Clustering Algorithms: A Comprehensive Review, Variants Analysis, and Advances in the Era of Big Data","volume":"622","author":"Ikotun","year":"2023","journal-title":"Inf. Sci."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Rimini, D., Agostini, V., and Knaflitz, M. (2017, January 22\u201325). Evaluation of Muscle Synergies Stability in Human Locomotion: A Comparison between Normal and Fast Walking Speed. Proceedings of the 2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Turin, Italy.","DOI":"10.1109\/I2MTC.2017.7969722"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"87","DOI":"10.1016\/S0021-9290(02)00243-9","article-title":"How Do Load Carriage and Walking Speed Influence Trunk Coordination and Stride Parameters?","volume":"36","author":"LaFiandra","year":"2003","journal-title":"J. Biomech."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1204","DOI":"10.1007\/s10439-017-1802-z","article-title":"Tuning of Muscle Synergies During Walking Along Rectilinear and Curvilinear Trajectories in Humans","volume":"45","author":"Pedrocchi","year":"2017","journal-title":"Ann. Biomed. Eng."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"157","DOI":"10.2522\/ptj.20090125","article-title":"Dynamic Principles of Gait and Their Clinical Implications","volume":"90","author":"Kuo","year":"2010","journal-title":"Phys. Ther."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"272","DOI":"10.1002\/jor.1100020309","article-title":"Kinematic and EMG Patterns during Slow, Free, and Fast Walking","volume":"2","author":"Murray","year":"1984","journal-title":"J. Orthop. Res."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"370","DOI":"10.1134\/S0362119722040089","article-title":"Motor Synergy Structure Variability in Different Intensity Locomotions","volume":"48","author":"Moiseev","year":"2022","journal-title":"Hum. Physiol."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"194","DOI":"10.1016\/S0966-6362(03)00062-6","article-title":"Muscle Force Redistributes Segmental Power for Body Progression during Walking","volume":"19","author":"Neptune","year":"2004","journal-title":"Gait Posture"},{"key":"ref_47","unstructured":"Perry, J., and Burnfield, J.M. (2010). Gait Analysis: Normal and Pathological Function, SLACK. [2nd ed.]."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"1775","DOI":"10.1016\/j.neuroimage.2004.05.003","article-title":"Feedforward and Feedback Processes in Motor Control","volume":"22","author":"Seidler","year":"2004","journal-title":"NeuroImage"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"1176","DOI":"10.1111\/dmcn.12826","article-title":"Muscle Synergies and Complexity of Neuromuscular Control during Gait in Cerebral Palsy","volume":"57","author":"Steele","year":"2015","journal-title":"Dev. Med. Child Neurol."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"976100","DOI":"10.3389\/fnhum.2022.976100","article-title":"External Walking Environment Differentially Affects Muscle Synergies in Children with Cerebral Palsy and Typical Development","volume":"16","author":"Kim","year":"2022","journal-title":"Front. Hum. Neurosci."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"529","DOI":"10.1152\/jn.00379.2021","article-title":"Mixed Matrix Factorization: A Novel Algorithm for the Extraction of Kinematic-Muscular Synergies","volume":"127","author":"Scano","year":"2022","journal-title":"J. Neurophysiol."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"159","DOI":"10.1152\/jn.00653.2011","article-title":"Task-Level Feedback Can Explain Temporal Recruitment of Spatially Fixed Muscle Synergies throughout Postural Perturbations","volume":"107","author":"Safavynia","year":"2012","journal-title":"J. Neurophysiol."},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Brambilla, C., and Scano, A. (2022). The Number and Structure of Muscle Synergies Depend on the Number of Recorded Muscles: A Pilot Simulation Study with OpenSim. Sensors, 22.","DOI":"10.3390\/s22228584"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"105","DOI":"10.3389\/fncom.2013.00105","article-title":"The Number and Choice of Muscles Impact the Results of Muscle Synergy Analyses","volume":"7","author":"Steele","year":"2013","journal-title":"Front. Comput. Neurosci."},{"key":"ref_55","doi-asserted-by":"crossref","unstructured":"Beltrame, G., Scano, A., Marino, G., Peccati, A., Molinari Tosatti, L., and Portinaro, N. (2023). Recent Developments in Muscle Synergy Analysis in Young People with Neurodevelopmental Diseases: A Systematic Review. Front. Bioeng. Biotechnol., 11.","DOI":"10.3389\/fbioe.2023.1145937"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1016\/j.gaitpost.2016.07.095","article-title":"The Effect of EMG Processing Choices on Muscle Synergies before and after BoNT-A Treatment in Cerebral Palsy","volume":"49","author":"Oudenhoven","year":"2016","journal-title":"Gait Posture"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"1153","DOI":"10.1152\/jn.00679.2017","article-title":"Backward Walking Highlights Gait Asymmetries in Children with Cerebral Palsy","volume":"119","author":"Cappellini","year":"2018","journal-title":"J. Neurophysiol."}],"container-title":["Bioengineering"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2306-5354\/11\/2\/173\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T13:58:22Z","timestamp":1760104702000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2306-5354\/11\/2\/173"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,2,10]]},"references-count":57,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2024,2]]}},"alternative-id":["bioengineering11020173"],"URL":"https:\/\/doi.org\/10.3390\/bioengineering11020173","relation":{},"ISSN":["2306-5354"],"issn-type":[{"value":"2306-5354","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,2,10]]}}}