title: A comparison between two models of shoulder muscle force estimation.
abstract: Shoulder injuries are often related to rotator cuff muscles. Although there are various models for muscle force estimation, it is difficult to ensure that the results obtained with such models are reliable. The aim of the current study was to compare two models of muscle force estimation. Eight subjects, seven male and one female (mean age of 24 yr; mean height of 1.83 m), performed five isokinetic maximum concentric contractions of internal and external shoulder rotation. Two models with different algorithms were used. In both, the input data consisted of the measured internal rotation moment. Comparisons were made between the difference and the average results obtained with each model of muscle force estimation. There was reasonable agreement among the results for force between the two models for subscapularis, pectoralis major, and anterior deltoideus muscles results. Conversely, poor correlation was found for the latissimus dorsi, teres major, and middle deltoid. These results suggest that the algorithm structure might have a strong effect on muscle force estimation results.
authors.affiliation: Physical Education, Federal University of Rio Grande do Sul, Porto Alegre City, RS, Brazil.
authors.forename: Daniel Cury
authors.initials: DC
authors.lastname: Ribeiro
authors.forename: Joelly Mahnic
authors.initials: JM
authors.lastname: de Toledo
authors.forename: Roberto Costa
authors.initials: RC
authors.lastname: Krug
authors.forename: Jefferson Fagundes
authors.initials: JF
authors.lastname: Loss
mesh_terms: D000328:Adult; D003198:Computer Simulation; D005260:Female; D006801:Humans; D008297:Male; D008954:Models, Biological; D009068:Movement / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D012782:Shoulder / Q000502:physiology*; D055815:Young Adult