16
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Gymnasts and non-athletes muscle activation and torque production at the ankle joint Translated title: Ativação muscular e torque na articulação do tornozelo entre ginastas e não-atletas

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Artistic Gymnasts (AG) execute specific movements that require substantial movement control and force production at the ankle joint. This high demand might change the neuromechanical properties of the ankle joint muscles in these athletes compared to non-athlete girls (NAG). The aim of this study was to compare muscle activation and torque production at the ankle joint between AG and NAG. Ten AG (11.70 ± 1.06 years of age) and 10 NAG (11.70 ± 1.49 years of age) participated in the study. Electromyographic (EMG) signals of medial gastrocnemius (MG), soleus (SO) and tibialis anterior (TA) were obtained simultaneously to the maximal isometric plantarflexion (PFT) and dorsiflexion (DFT) torques of the dominant limb during a maximal voluntary isometric contraction (MVIC) at five different joint angles (20°, 10°, 0°, -10° e -20°). Neuromuscular efficiency was also calculated by the Torque/EMG ratio. AG presented higher PFT (p<0.01) and smaller DFT (p<0.05) at all joint angles compared to NAG. RMS values from the three muscles were similar between groups (p>0.05). In addition, AG showed higher values for plantarflexion neuromuscular efficiency and smaller values of dorsiflexion neuromuscular efficiency compared to the NAG (p<0.01). Higher sports demands of AG determined higher PFT, higher plantarflexor efficiency, smaller DFT but similar activation of MG, SO and TA compared to NAG.

          Translated abstract

          Ginastas artísticas (GA) executam movimentos específicos que exigem grande controle do movimento e produção de força na articulação do tornozelo. Essa elevada demanda desse esporte pode alterar as propriedades neuromecânicas dos músculos do tornozelo quando comparado a meninas não-atletas. Objetivou-se comparar a ativação muscular e a produção de torque na articulação do tornozelo entre GA e meninas não-atletas (MNA). Participaram do estudo 10 GA (11,70 ± 1,06 anos) e 10 MNA (11,70 ± 1,49 anos). Sinais eletromiográficos (EMG) dos músculos gastrocnêmio medial (GM), sóleo (SO) e tibial anterior (TA) foram obtidos simultaneamente ao torque isométrico máximo de flexão plantar (TFP) e flexão dorsal (TFD) no tornozelo dominante durante contração voluntária máxima isométrica (CVMI) em cinco ângulos articulares (20°, 10°, 0°, -10° e -20°). Além disso, a eficiência neuromuscular foi calculada por meio da razão Torque/EMG. GA apresentaram maior TFP (p<0,01) e menor TFD (p<0,05) em todos os ângulos articulares comparadas às MNA. Os valores RMS nos três músculos avaliados não diferiram entre os grupos (p>0,05). Além disso, GA apresentaram maiores valores de eficiência neuromuscular de flexão plantar, e menores de flexão dorsal, comparadas às MNA (p<0,01). A maior d emanda do esporte nas GA determinou maior TFP e maior eficiência de flexão plantar, mas menor TFD e igual ativação do GM, SO e TA comparadas à MNA.

          Related collections

          Most cited references25

          • Record: found
          • Abstract: found
          • Article: not found

          Footedness is a better predictor than is handedness of emotional lateralization.

          A tremendous amount of experimental work has attempted to identify reliable behavioural predictors of cerebral lateralization. Preferred handedness has been the most popular predictor, but some recent reports suggest that preferred footedness may serve as a more accurate predictor of functional laterality, especially in the left-handed population. The present study sought to test this claim by selectively recruiting individuals with either 'crossed' lateral preferences (right-handed and left-footed or left-handed and right-footed) or 'uncrossed' lateral preferences (right-handed and right-footed or left-handed and left-footed). Lateralization of emotional perception was assessed with two blocks of the dichotic Emotional Words Test (EWT), and lateral preference for both handedness and footedness was assessed using self-report questionnaires. Ear advantage on the dichotic task varied significantly with preferred foot (P=0.003), but not with preferred hand. Cerebral lateralization may be more related to footedness than to other lateral preferences.
            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Validade da auto-avaliação na determinação da, maturação sexual

              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Injury prevention in women's gymnastics.

              W Sands (2000)
              The most serious problem faced by contemporary gymnasts is injury. Given that prevention is superior to treatment, can the gymnastics community and the scientific and medical community do a better job at injury prevention? Most research in gymnastics has been descriptive in nature. Injury prevention ultimately requires that one can predict the outcome of certain activities and their injurious nature. Making such predictions requires a knowledge of the scientific and medical aspects of injury, but more than that, one must have an intimate knowledge of the sport. Injury prevention efforts must be firmly grounded in science and medicine while making pragmatic linkages to gymnastics as it exists and is practiced. This article attempts to bridge the gap between the scientific and medical community and what actually happens in gymnastics.
                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbcdh
                Revista Brasileira de Cineantropometria & Desempenho Humano
                Rev. bras. cineantropom. desempenho hum.
                Universidade Federal de Santa Catarina (Florianópolis )
                1980-0037
                September 2014
                : 16
                : 5
                : 555-562
                Affiliations
                [1 ] Universidade Federal do Rio Grande do Sul Brazil
                [2 ] Universidade de Caxias do Sul Brazil
                [3 ] Faculdade da Serra Gaúcha Brazil
                [4 ] Physical Education Department Brazil
                [5 ] Faculty of Physical Education Brazil
                Article
                S1980-00372014000500555
                10.5007/1980-0037.2014v16n5p555
                2270f723-4b7d-4e80-8223-e54511588c7d

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1980-0037&lng=en
                Categories
                SPORT SCIENCES

                Sports medicine
                Training,Eletromiografia,Ginástica,Torque,Treinamento,Gymnastics,Electromyography
                Sports medicine
                Training, Eletromiografia, Ginástica, Torque, Treinamento, Gymnastics, Electromyography

                Comments

                Comment on this article