Evaluation of the Electromyographic Amplitude-to-Work Ratio in the Infraspinatus Muscle During External Shoulder Rotation Exercises: A Comparison of Concentric Isotonic and Isokinetic Exercises
DC Field | Value | Language |
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dc.contributor.author | Park, Jung-Ho | - |
dc.contributor.author | Chung, Seok Won | - |
dc.contributor.author | Lee, Seoung-Joon | - |
dc.contributor.author | Lee, Jong-Won | - |
dc.contributor.author | Oh, Kyung-Soo | - |
dc.date.accessioned | 2021-08-30T19:48:19Z | - |
dc.date.available | 2021-08-30T19:48:19Z | - |
dc.date.created | 2021-06-19 | - |
dc.date.issued | 2020-07 | - |
dc.identifier.issn | 2325-9671 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/54476 | - |
dc.description.abstract | Background: Isotonic exercise is commonly adopted for shoulder rehabilitation, but the efficacy of isokinetic exercise for rehabilitation has not been evaluated. Purpose: To evaluate the efficacy of isotonic and isokinetic external shoulder rotation exercises. Study Design: Controlled laboratory study. Methods: Using surface electromyography (EMG) and the Biodex system, we investigated the EMG amplitude of the infraspinatus (IS), total work (tWK), and EMG(IS)/tWK ratio and examined the relative IS and posterior deltoid (PD) contributions to all exercises. A total of 24 healthy participants without musculoskeletal injuries were included. Participants performed isotonic external shoulder rotation at 10%, 20%, 30%, 40%, and 50% of the maximum voluntary isometric contraction (MVIC) as well as isokinetic external shoulder rotation at angular velocities of 60, 120, 180, 240, and 300 deg/s. Levels of intensity were classified from 1 to 5: level 1 corresponded to 10% of the MVIC and a 300-deg/s angular velocity; level 2 corresponded to 20% MVIC and 240 deg/s; level 3 corresponded to 30% MVIC and 180 deg/s; level 4 corresponded to 40% MVIC and 120 deg/s; and level 5 corresponded to 50% MVIC and 60 deg/s. Normalized IS and tWK amplitudes were calculated for each exercise. Results: During isotonic exercise, the EMG(IS)/tWK ratio significantly decreased from level 5 to 3, 2, and 1; from level 4 to 2 and 1; and from level 3 to 1. During isokinetic exercise, the EMG(IS)/tWK ratio at level 3 was greater than that at all other levels except level 1. Statistical differences were found between isotonic and isokinetic modes at levels 1, 2, and 3. The IS/PD activation ratios were not significantly different between exercise modes at any level. Conclusion: Isokinetic resistance may provide more effective stimulation of the IS muscle compared with isotonic resistance. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | SAGE PUBLICATIONS INC | - |
dc.subject | CUFF REPAIR | - |
dc.subject | REHABILITATION | - |
dc.title | Evaluation of the Electromyographic Amplitude-to-Work Ratio in the Infraspinatus Muscle During External Shoulder Rotation Exercises: A Comparison of Concentric Isotonic and Isokinetic Exercises | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Park, Jung-Ho | - |
dc.identifier.doi | 10.1177/2325967120932459 | - |
dc.identifier.scopusid | 2-s2.0-85087748463 | - |
dc.identifier.wosid | 000549186000001 | - |
dc.identifier.bibliographicCitation | ORTHOPAEDIC JOURNAL OF SPORTS MEDICINE, v.8, no.7 | - |
dc.relation.isPartOf | ORTHOPAEDIC JOURNAL OF SPORTS MEDICINE | - |
dc.citation.title | ORTHOPAEDIC JOURNAL OF SPORTS MEDICINE | - |
dc.citation.volume | 8 | - |
dc.citation.number | 7 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Orthopedics | - |
dc.relation.journalResearchArea | Sport Sciences | - |
dc.relation.journalWebOfScienceCategory | Orthopedics | - |
dc.relation.journalWebOfScienceCategory | Sport Sciences | - |
dc.subject.keywordPlus | CUFF REPAIR | - |
dc.subject.keywordPlus | REHABILITATION | - |
dc.subject.keywordAuthor | Isotonic | - |
dc.subject.keywordAuthor | isokinetic | - |
dc.subject.keywordAuthor | concentric | - |
dc.subject.keywordAuthor | shoulder | - |
dc.subject.keywordAuthor | external rotation | - |
dc.subject.keywordAuthor | electromyography | - |
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