Muscle Activity and Coordination in the Normal Shoulder

Kronberg, M; Németh, Gunnar; Broström, Lars‐Åke

doi:10.1097/00003086-199008000-00016

Cited by 312 publications

(230 citation statements)

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“…All muscles were also given an active part, which was contracted with a specific force. This muscular force was automatically calculated by a feedback algorithm, which assumed fixed force ratios estimated from EMG measurements (Kronberg et al, 1990). During an imposed motion of the arm, this feedback algorithm is continuously predicting the muscular forces that solved the mechanical equilibrium, the contact stability and the muscle ratio constrain.…”

Section: Methodsmentioning

confidence: 99%

Importance of polyethylene thickness in total shoulder arthroplasty: A finite element analysis

Terrier

Brighenti

Pioletti

et al. 2012

Clinical Biomechanics

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Background: Articular surfaces reconstruction is essential in total shoulder arthroplasty. Because of the limited glenoid bone support, thin glenoid component could improve anatomical reconstruction, but adverse mechanical effects might appear. Methods: With a numerical musculoskeletal shoulder model, we analysed and compared three values of thickness of a typical all-polyethylene glenoid component: 2, 4 (reference) and 6 mm. A loaded movement of abduction in the scapular plane was simulated. We evaluated the humeral head translation, the muscle moment arms, the joint force, the articular contact pattern, and the polyethylene and cement stress. Findings Decreasing polyethylene thickness from 6 to 2 mm slightly increased humeral head translation and muscle moment arms. This induced a small decreased of the joint reaction force, but important increase of stress within the polyethylene and the cement mantel. Interpretation The reference thickness of 4 mm seems a good compromise to avoid stress concentration and joint stuffing.

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Section: Methodsmentioning

confidence: 99%

Importance of polyethylene thickness in total shoulder arthroplasty: A finite element analysis

Terrier

Brighenti

Pioletti

et al. 2012

Clinical Biomechanics

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“…During the push phase, the prime movers of shoulder flexion (pectoralis major, anterior deltoid, and biceps brachii muscles), 52,53 and the triceps brachii muscle are mostly active. 18,54,55 This involves flexor and extensor muscle coordination around the elbow, leading to an increased tendency to fatigue in individual muscles of the upper extremity.…”

Section: Figure 4 Mpf During the Heavy Exercise Boutmentioning

confidence: 99%

“…The infraspinatus muscle, representing the rotator cuff muscles, 56 stabilizes the humeral head laterally 53 and counteracts the action of the medial rotator muscles on the shoulder. 53,57 The infraspinatus muscle also prevents the superior translation of the humeral head during shoulder abduction, a movement occurring during the recovery phase of the manual wheelchair propulsion cycle.…”

Section: Figure 4 Mpf During the Heavy Exercise Boutmentioning

confidence: 99%

“…53,57 The infraspinatus muscle also prevents the superior translation of the humeral head during shoulder abduction, a movement occurring during the recovery phase of the manual wheelchair propulsion cycle.…”

Section: Figure 4 Mpf During the Heavy Exercise Boutmentioning

confidence: 99%

“…However, it also stabilizes the humeral head during shoulder flexion, 53 an action necessary during the push phase. We hypothesize that the activity of the latissimus dorsi during both muscle coordination and the recovery phase can explain the observed fatigue of this muscle.…”

Section: Figure 4 Mpf During the Heavy Exercise Boutmentioning

confidence: 99%

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Changes in oxygen uptake, shoulder muscles activity, and propulsion cycle timing during strenuous wheelchair exercise

et al. 2006

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Study design: Cross-over study. Objective: To determine the effect of strenuous wheelchair exercise on oxygen uptake ( . VO 2 ), muscle activity and propulsion cycle timing (including the push time and recovery time during one full arm cycle). Setting: Laboratory of Sport Sciences at the University of France-Comte in France. Methods: Two exercise bouts of 6-min duration were performed at a constant workload:(1) non-fatigable exercise (moderate workload) and (2) fatigable exercise (heavy workload). Measurement of .VO 2 , surface electromyographic activity (EMG) from shoulder muscles, and temporal parameters of wheelchair ergometer propulsion were collected from eight able-bodied men (2674 years). Results: A progressive increase in .VO 2 associated with EMG alterations (Po0.05), and a decrease of the cycle and recovery time (Po0.05) during the heavy exercise. Whereas the push time remained constant, an increased muscle activation time (Po0.05) was found during heavy exercise. Conclusion: Observations during wheelchair ergometry indicate the development of fatigue and inefficient muscle coordination, which may contribute to deleterious stress distributions at the shoulder joint, increasing susceptibility to injury.

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Shoulder Injuries in Sport

Horsley

2010

Sports Rehabilitation and Injury Prevention

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Muscle Activity and Coordination in the Normal Shoulder

Cited by 312 publications

References 0 publications

Importance of polyethylene thickness in total shoulder arthroplasty: A finite element analysis

Importance of polyethylene thickness in total shoulder arthroplasty: A finite element analysis

Changes in oxygen uptake, shoulder muscles activity, and propulsion cycle timing during strenuous wheelchair exercise

Shoulder Injuries in Sport

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