Do judokas present differences between upper limbs for the concentric strength of the internal and external rotators of the shoulder?

Article type: Research Article

Authors: Aedo-Muñoz, Esteban^a | Brito, Ciro José^{b; c; *} | Muñoz, Pablo Merino^d | Nóbrega, Otávio de Toledo^e | Miarka, Bianca^f | Valenzuela, Matias Gonzalez^g | Arriagada-Tarifeño, David^h

Affiliations: [a] Sciences of Physical Activity, Sports and Health School, Faculty of Medical Sciences, Universidad de Santiago de Chile (USACH), Santiago, Chile | [b] Sciences of Physical Activity, Sports and Health School, Faculty of Medical Sciences, Universidad de Santiago de Chile (USACH), Santiago, Chile | [c] Department of Physical Education, Federal University of Juiz de Fora, Campus Governador Valadares, Governador Valadares, MG, Brazil | [d] Núcleo de Investigación en Ciencias de la Motricidad Humana, Universidad Adventista de Chile, Chile | [e] Postgraduation Program in Medical Sciences, University of Brasilia, Campus Universitario Darcy Ribeiro, Brasilia, DF, Brazil | [f] Department of Physical Education, Laboratory of Psychophysiology and Performance in Sports & Combats, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil | [g] Kinesiology School, Faculty of Medical Sciences, | [h] Kinesiology School, Faculty of Medical Sciences,

Correspondence: [*] Corresponding author: Ciro José Brito, Federal University of Juiz de Fora. Street Sao Paulo, 745, Campus Governador Valadares, MG, Brazil. E-mail: cirojbrito@gmail.com.

Abstract: BACKGROUND: Long-time judo training can lead athletes to develop upper limb asymmetry and shoulder asymmetry during force production, mainly in the action of pulling, pushing, and throwing; that requires higher strength and velocity of the internal and external rotators of the shoulders, which may also result in shoulder injury, or a decrease in judo performance. OBJECTIVE: To investigate asymmetries in concentric force of the internal and external shoulder rotators of the dominant and non-dominant upper limbs in high-level judokas at angular velocities of 60, 180, and 300∘/s. METHODS: 14 highly trained male judokas (age 24.4 ± 4.8 yrs.; body mass 87.9 ± 18.7 kg; height 1.8 ± 0.1 m). All participants performed 5 attempts of movement concentric internal and external rotation of the shoulder with 3 angular velocities (60∘/s, 180∘/s, and 300∘/s) in an isokinetic dynamometer (Cybex® Humac Norm Dynamometer CSMI, model 502140). The data were analyzed by independent t-student (discrete analysis) a statistical parametric mapping (SPM) curve (one-dimensional analysis). There was no difference in dominant vs. non-dominant for discrete analysis (p> 0.05). There was no difference in dominant vs. non-dominant for SPM analysis. None of the comparisons surpassed the comparison cut-off (tcrit) for the t-test (p> 0.05). CONCLUSIONS: Based on results, judokas do not present significant asymmetries in concentric force of external or internal shoulder rotators when compared to the dominant vs. the non-dominant upper limb according to discrete and one-dimensional (SPM) analysis.

Keywords: Martial arts, biomechanics, athletic performance, task performance and analysis, statistical parametric mapping

DOI: 10.3233/IES-230073

Journal: Isokinetics and Exercise Science, vol. Pre-press, no. Pre-press, pp. 1-10, 2023