{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,29]],"date-time":"2026-10-29T02:12:39Z","timestamp":1793239959051,"version":"4.5.0"},"reference-count":27,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,4,9]],"date-time":"2025-04-09T00:00:00Z","timestamp":1744156800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Hum. Neurosci."],"abstract":"<jats:sec><jats:title>Introduction<\/jats:title><jats:p>To develop an efficient rehabilitation program for patients with stroke to acquire fine motor skills such as chopstick manipulation, it is necessary to examine the differences in fundamental muscle functions between the hands during motor tasks. The aim of this study was to clarify the differences in muscle activity and intermuscular coordination between dominant and non-dominant hands during chopstick manipulation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Twenty-eight healthy adults performed the task of picking up different-sized objects using chopsticks with either their dominant or non-dominant hand. Surface electromyography of 11 intrinsic and extrinsic hand muscles was performed, and muscle activity and muscle activity waveforms during the task were calculated. Activity patterns and weighting for each pattern were extracted from the muscle activity waveforms using non-negative matrix factorization to represent muscle synergy. The muscle activity and weighting were compared between the dominant and non-dominant hands and among different-sized objects.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The activities of most intrinsic and extrinsic muscles did not significantly differ between the dominant and non-dominant hands or among different-sized objects. Although activity patterns showed the coordination of intrinsic hand muscles in both the dominant and non-dominant hands, the combinations of the weighting differed between the dominant and non-dominant hands. The non-dominant hand had different muscle activation patterns of intrinsic and extrinsic hand muscles compared to the dominant hand. The activity patterns and weighting were mostly similar across different-sized objects.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The dominant hand showed coordination of the first and second lumbrical muscles, whereas the non-dominant hand showed no muscle activation patterns between the muscles. Therefore, it is important to emphasize the first and second lumbrical in the non-dominant hand during rehabilitation to improve the coordination between the muscles of the two hands during chopstick manipulation to effectively improve chopstick manipulation skills in the non-dominant hand.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fnhum.2025.1574002","type":"journal-article","created":{"date-parts":[[2025,4,9]],"date-time":"2025-04-09T05:20:29Z","timestamp":1744176029000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Differences in muscle activity and intermuscular coordination between dominant and non-dominant hands during chopstick manipulation"],"prefix":"10.3389","volume":"19","author":[{"given":"Hina","family":"Komi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroshi","family":"Kurumadani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuya","family":"Kurauchi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shota","family":"Date","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Toru","family":"Sunagawa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2025,4,9]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"443","DOI":"10.1016\/j.neuron.2011.10.008","article-title":"Neuroplasticity subserving motor skill learning","volume":"72","author":"Dayan","year":"2011","journal-title":"Neuron"},{"key":"ref2","doi-asserted-by":"publisher","first-page":"1144","DOI":"10.1177\/0898264316654674","article-title":"Associations between fine motor performance in activities of daily living and cognitive ability in a nondemented sample of older adults: implications for geriatric physical rehabilitation","volume":"29","author":"Fauth","year":"2017","journal-title":"J. Aging Health"},{"key":"ref3","doi-asserted-by":"publisher","first-page":"425","DOI":"10.3389\/fnins.2016.00425","article-title":"A personalized multi-channel FES controller based on muscle synergies to support gait rehabilitation after stroke","volume":"10","author":"Ferrante","year":"2016","journal-title":"Front. Neurosci"},{"key":"ref4","doi-asserted-by":"publisher","first-page":"395","DOI":"10.1016\/0003-6870(91)90082-S","article-title":"An investigation for determining the optimum length of chopsticks","volume":"22","author":"Hsu","year":"1991","journal-title":"Appl. Ergon."},{"key":"ref5","first-page":"23","article-title":"Relationship between manners of holding chopsticks and ability of operating them by non-dominant hand (in Japanese)","volume":"17","author":"Kamitani","year":"2017","journal-title":"Jpn. J. Occup. Ther. Res."},{"key":"ref6","doi-asserted-by":"publisher","first-page":"3109","DOI":"10.1007\/s00221-019-05653-5","article-title":"Brain functional differences in visuo-motor task adaptation between dominant and non-dominant hand training","volume":"237","author":"Kirby","year":"2019","journal-title":"Exp. Brain Res."},{"key":"ref7","doi-asserted-by":"publisher","first-page":"1678221","DOI":"10.1080\/2331205X.2019.1678221","article-title":"Muscle activity in throwing with the dominant and non-dominant arm","volume":"6","author":"Kuhtz-Buschbeck","year":"2019","journal-title":"Cogent. Med."},{"key":"ref8","doi-asserted-by":"publisher","first-page":"101754","DOI":"10.1016\/j.hansur.2024.101754","article-title":"Hand muscle synergy in chopstick use: effect of object size and weight","volume":"43","author":"Kurauchi","year":"2024","journal-title":"Hand Surg. Rehabil."},{"key":"ref9","doi-asserted-by":"publisher","first-page":"111748","DOI":"10.1016\/j.jbiomech.2023.111748","article-title":"Measurement of the lumbrical muscle activity of the hand using electromyography supported by the ultrasound imaging technique with string navigation","volume":"158","author":"Kurumadani","year":"2023","journal-title":"J. Biomech."},{"key":"ref10","doi-asserted-by":"publisher","first-page":"741","DOI":"10.1016\/S1474-4422(09)70150-4","article-title":"Motor recovery after stroke: a systematic review","volume":"8","author":"Langhorne","year":"2009","journal-title":"Lancet Neurol."},{"key":"ref11","doi-asserted-by":"publisher","first-page":"737","DOI":"10.1016\/j.apergo.2007.11.006","article-title":"An auxiliary device for chopsticks operation to improve the food-serving performance","volume":"39","author":"Lee","year":"2008","journal-title":"Appl. Ergon."},{"key":"ref12","doi-asserted-by":"publisher","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":"ref13","doi-asserted-by":"crossref","first-page":"853","DOI":"10.2106\/00004623-197052050-00001","article-title":"Intrinsic-extrinsic muscle control of the hand in power grip and precision handling: an electromyographic study","volume":"52","author":"Long","year":"1970","journal-title":"JBJS"},{"key":"ref14","doi-asserted-by":"publisher","first-page":"160","DOI":"10.5432\/ijshs.201714","article-title":"Comparison of modular control of trunk muscle by Japanese archery competitive level: a pilot study","volume":"15","author":"Matsunaga","year":"2017","journal-title":"Int. J. Sport Health Sci."},{"key":"ref15","doi-asserted-by":"publisher","first-page":"412","DOI":"10.1016\/j.jbiomech.2009.10.009","article-title":"Modular control of human walking: adaptations to altered mechanical demands","volume":"43","author":"McGowan","year":"2010","journal-title":"J. Biomech."},{"key":"ref16","doi-asserted-by":"publisher","first-page":"207","DOI":"10.1016\/S0165-0270(98)00054-5","article-title":"Using factor analysis to identify neuromuscular synergies during treadmill walking","volume":"82","author":"Merkle","year":"1998","journal-title":"J. Neurosci. Methods"},{"key":"ref17","doi-asserted-by":"publisher","first-page":"123","DOI":"10.1145\/3478110","article-title":"Reducing muscle activity when playing tremolo by using electrical muscle stimulation to learn efficient motor skills","volume":"5","author":"Niijima","year":"2021","journal-title":"Proc. ACM Interact. Mob. Wearable Ubiquitous Technol."},{"key":"ref18","doi-asserted-by":"publisher","first-page":"2H1","DOI":"10.5100\/jje.55.2H1-1","article-title":"2H1-1 a study on the force adjustment by non-dominant hand. JES","volume":"55","author":"Nishizawa","year":"2019","journal-title":"Ergonomics"},{"key":"ref19","doi-asserted-by":"publisher","first-page":"283","DOI":"10.1016\/j.neuroscience.2012.10.027","article-title":"Fast changes in direction during human locomotion are executed by impulsive activation of motor modules","volume":"228","author":"Oliveira","year":"2013","journal-title":"Neuroscience"},{"key":"ref20","doi-asserted-by":"publisher","first-page":"446","DOI":"10.3390\/bs12110446","article-title":"Immediate effects of fine-motor training on coordination and dexterity of the non-dominant hand in healthy adults: a randomized controlled trial","volume":"12","author":"Park","year":"2022","journal-title":"Behav. Sci."},{"key":"ref21","doi-asserted-by":"publisher","first-page":"472","DOI":"10.1016\/j.gaitpost.2015.07.061","article-title":"Upper extremity coordination strategies depending on task demand during a basic daily activity","volume":"42","author":"Ricci","year":"2015","journal-title":"Gait Posture"},{"key":"ref22","doi-asserted-by":"publisher","first-page":"5979","DOI":"10.1038\/s41598-018-24332-z","article-title":"Muscle synergies are consistent across level and uphill treadmill running","volume":"8","author":"Saito","year":"2018","journal-title":"Sci. Rep."},{"key":"ref23","doi-asserted-by":"publisher","first-page":"20397","DOI":"10.1038\/s41598-019-56956-0","article-title":"Acquisition of chopstick-operation skills with the non-dominant hand and concomitant changes in brain activity","volume":"9","author":"Sawamura","year":"2019","journal-title":"Sci. Rep."},{"key":"ref24","volume-title":"Anatomy, shoulder and upper limb, hand Lumbrical muscles","author":"Valenzuela","year":"2024"},{"key":"ref25","doi-asserted-by":"publisher","first-page":"149","DOI":"10.1016\/j.jhsa.2013.06.029","article-title":"A biomechanical and evolutionary perspective on the function of the lumbrical muscle","volume":"39","author":"Wang","year":"2014","journal-title":"J. Hand Surg. Am."},{"key":"ref26","doi-asserted-by":"publisher","first-page":"15","DOI":"10.1016\/1050-6411(94)90023-X","article-title":"Crosstalk in surface electromyography: theoretical and practical estimates","volume":"4","author":"Winter","year":"1994","journal-title":"J. Electromyogr. Kinesiol."},{"key":"ref27","doi-asserted-by":"publisher","first-page":"18480","DOI":"10.1038\/s41598-021-98022-8","article-title":"Basic locomotor muscle synergies used in land walking are finely tuned during underwater walking","volume":"11","author":"Yokoyama","year":"2021","journal-title":"Sci. Rep."}],"container-title":["Frontiers in Human Neuroscience"],"original-title":[],"link":[{"URL":"https:\/\/www.frontiersin.org\/articles\/10.3389\/fnhum.2025.1574002\/full","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,4,9]],"date-time":"2025-04-09T05:20:30Z","timestamp":1744176030000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.frontiersin.org\/articles\/10.3389\/fnhum.2025.1574002\/full"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,4,9]]},"references-count":27,"alternative-id":["10.3389\/fnhum.2025.1574002"],"URL":"https:\/\/doi.org\/10.3389\/fnhum.2025.1574002","relation":{},"ISSN":["1662-5161"],"issn-type":[{"value":"1662-5161","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,4,9]]},"article-number":"1574002"}}