{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T17:51:00Z","timestamp":1778781060334,"version":"3.51.4"},"reference-count":32,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2014,2,6]],"date-time":"2014-02-06T00:00:00Z","timestamp":1391644800000},"content-version":"vor","delay-in-days":220,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Occupational Health"],"published-print":{"date-parts":[[2013,7]]},"abstract":"<jats:sec><jats:label\/><jats:p><jats:bold>Scapular Kinematics and Muscle Activities during Pushing Tasks: Chun\u2010Kai HUANG, <jats:italic>et al<\/jats:italic>. Division of Physical Therapy Education, School of Allied Health Professions, University of Nebraska Medical Center, USA\u2014<\/jats:bold><\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>Pushing tasks are functional activities of daily living. However, shoulder complaints exist among workers exposed to regular pushing conditions. It is crucial to investigate the control of shoulder girdles during pushing tasks. The objective of the study was to demonstrate scapular muscle activities and motions on the dominant side during pushing tasks and the relationship between scapular kinematics and muscle activities in different pushing conditions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Thirty healthy adults were recruited to push a four\u2010wheel cart in six pushing conditions. The electromyographic signals of the upper trapezius (UT) and serratus anterior (SA) muscles were recorded. A video\u2010based system was used for measuring the movement of the shoulder girdle and scapular kinematics. Differences in scapular kinematics and muscle activities due to the effects of handle heights and weights of the cart were analyzed using two\u2010wayANOVAwith repeated measures. The relationships between scapular kinematics and muscle activities were examined by Pearson's correlation coefficients.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The changes in upper trapezius and serratus anterior muscle activities increased significantly with increased pushing weights in the one\u2010step pushing phase. The UT\/SA ratio on the dominant side decreases significantly with increased handle heights in the one\u2010step pushing phase. The changes in upward rotation, lateral slide and elevation of the scapula decreased with increased pushing loads in the trunk\u2010forward pushing phase.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This study indicated that increased pushing loads result in decreased motions of upward rotation, lateral slide and elevation of the scapula; decreased handle heights result in relatively increased activities of the serratus anterior muscles during pushing tasks.<\/jats:p><\/jats:sec>","DOI":"10.1539\/joh.12-0105-oa","type":"journal-article","created":{"date-parts":[[2013,6,23]],"date-time":"2013-06-23T23:10:39Z","timestamp":1372029039000},"page":"259-266","source":"Crossref","is-referenced-by-count":4,"title":["Scapular Kinematics and Muscle Activities during Pushing Tasks"],"prefix":"10.1093","volume":"55","author":[{"given":"Chun\u2010Kai","family":"Huang","sequence":"first","affiliation":[{"name":"Division of Physical Therapy Education School of Allied 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