Electromyographic Activity of Scapular Muscle Control in Free-Motion Exercise

Nakamura, Yukiko; Tsuruike, Masaaki; Ellenbecker, Todd S.

doi:10.4085/1062-6050-51.4.10

Cited by 20 publications

(18 citation statements)

References 32 publications

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“…The EMG activity of the infraspinatus significantly increased as the resistance intensity increased during both the PER and SITER exercises. Our results support previous studies that have reported increased muscle activities of the infraspinatus and other shoulder muscles as the resistance intensity increased [13][14][15][16]23]. The PER and SITER exercises were performed with the shoulder at 90 ° abduction position, as the ER torque produced in this position is relatively greater than a 0 ° abducted position.…”

Section: Discussionsupporting

confidence: 89%

“…In particular, the normal muscle recruitment pattern that moves and stabilizes the humerus should be established at low loads, and muscle activities should be increased proportional to the load. Electromyography (EMG) studies have demonstrated that normal shoulder muscle activation levels increase in the torqueproducing muscles, as well as in the RC and scapular muscles, as load is increased during static or dynamic shoulder motion [2,[13][14][15][16]. In clinical settings, the resistance used to strengthen muscles is determined based on several criteria, including body weight, repetition maximum (RM) and MVIC.…”

Section: Introductionmentioning

confidence: 99%

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Appropriate Resistance Intensity and Effective Exercise for Activation of Infraspinatus

Jung

et al. 2019

Int J Sports Med

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We investigated the muscle activities of the infraspinatus and posterior deltoid, as well as the ratio of the infraspinatus to posterior deltoid muscle activities, in response to 3 resistance intensities during prone external rotation (PER) and sitting external rotation (SITER) exercises. Fifteen healthy males participated; the subjects performed two exercises randomly at three resistance intensity levels: 1) low intensity (10–20%); 2) medium intensity (45–55%); 3) high intensity (60–70%). Surface electromyography was used to measure the activities of the infraspinatus and posterior deltoid muscles. The activities of the infraspinatus and posterior deltoid increased significantly as the resistance intensity increased during both PER and SITER exercises (p<0.001). The infraspinatus-to-posterior deltoid activity ratio increased as the resistance intensity decreased. Whereas the muscle activity ratio was highest under low and medium intensity during PER and SITER, respectively, and the muscle activity ratio was significantly increased at medium intensity compared with high intensity during both PER (p=0.023) and SITER (p=0.001). Our results suggest that low to medium intensity is the appropriate resistance intensity for selective activation of the infraspinatus. In addition, our results suggest that PER and SITER are effective for strengthening the infraspinatus.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Appropriate Resistance Intensity and Effective Exercise for Activation of Infraspinatus

Jung

et al. 2019

Int J Sports Med

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“…Of the 12 studies included in the review, disagreement between the reviewers (ER and CM) with data extracted occurred in one study. 52 This was resolved by contacting the author to clarify EMG amplitudes to ensure accurate data extraction.…”

Section: Discussionmentioning

confidence: 99%

“…rEsulTs Twelve articles met the inclusion criteria for this review (online supplementary file 2). [52][53][54][55][56][57][58][59][60][61][62][63] Seventeen muscle groups were investigated in 204 participants without symptoms.…”

Section: Discussionmentioning

confidence: 99%

“…De Mey et al 53 Hardwick et al 54 Kaur et al 55 Kibler et al 56 Maenhout et al 57 Maenhout et al 58 Nagai et al 59 Nakamura et al 52 Smith et al 60 Tsuruike and Ellenbecker 61 Uhl et al 62 Yamauchi et al 63 Criteria 1-10 53 Hardwick et al 54 Kaur et al 55 Kibler et al 56 Maenhout et al 57 Maenhout et al 58 Nagai et al 59 Nakamura et al 52 Smith et al 60 Tsuruike and Ellenbecker 61 Uhl et al 62 Yamauchi et al 63 EMG detection of signal 4.00 With respect to EMG methodological quality, 7 of the 12 studies were awarded greater than 80%, 52 53 55 57-59 63 two between 70% and 79% 56 61 and three studies less than 70% 54 60 62 (table 3), with a mean percentage score of 78% (SD=10%).…”

Section: Article Reference Criteriamentioning

confidence: 99%

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Role of the kinetic chain in shoulder rehabilitation: does incorporating the trunk and lower limb into shoulder exercise regimes influence shoulder muscle recruitment patterns? Systematic review of electromyography studies

Richardson

Lewis

Gibson

et al. 2020

BMJ Open Sport Exerc Med

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ObjectiveTo investigate the influence of trunk and lower limb motion on electromyography (EMG) muscle activity and recruitment patterns around the shoulder.DesignSystematic review.Data sourcesMEDLINE, CINAHL, PEDro, AMED, PubMed, Cochrane Central Register of Controlled trials, Cochrane Database of Systematic reviews, SportsDiscuss and PROSPERO.Eligibility criteriaStudies investigating both multiregional kinetic chain (KC) shoulder exercises and localised non-kinetic chain (nKC) shoulder exercises in healthy subjects under the same experimental conditions were included in this review.ResultsKC exercises produced greater EMG activation levels in 5 of 11 studies for the lower trapezius. Of the remaining studies, five found no difference between the exercise types and one favoured nKC exercises. KC exercises produced greater EMG activation levels in 5 of 11 studies for the serratus anterior. Of the remaining studies, three reported the opposite and three found no significant difference between the exercise types. nKC exercises produced greater EMG activation in infraspinatus in three of four studies. KC exercises produced the lowest trapezius muscle ratios in all studies. Studies investigating the upper trapezius, middle trapezius, supraspinatus, subscapularis, biceps brachii, latifissimus dorsi, pectoralis major, deltoid, and trapezius and serratus anterior ratios showed inconsistency.ConclusionThis review found evidence that integrating the KC during shoulder rehabilitation may increase axioscapular muscle recruitment, produce lower trapezius muscle ratios and reduce the demands on the rotator cuff. Stepping appears preferable to squatting.PROSPERO registration numberCRD42015032557, 2015.

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Does sEMG normalization change results on sex differences in the activation of the shoulder girdle muscles during a simulated work task?

et al. 2020

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Electromyographic Activity of Scapular Muscle Control in Free-Motion Exercise

Abstract: Scapular muscle activity modulated relative to changes in body posture and resistance intensity. These findings will enable clinicians to prescribe the appropriate level of exercise intensity and positioning during shoulder rehabilitation.

Cited by 20 publications

References 32 publications

Appropriate Resistance Intensity and Effective Exercise for Activation of Infraspinatus

Appropriate Resistance Intensity and Effective Exercise for Activation of Infraspinatus

Role of the kinetic chain in shoulder rehabilitation: does incorporating the trunk and lower limb into shoulder exercise regimes influence shoulder muscle recruitment patterns? Systematic review of electromyography studies

Does sEMG normalization change results on sex differences in the activation of the shoulder girdle muscles during a simulated work task?

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