Dynamic postural analysis of vertical jump / Análise da postura dinâmica e do desempenho no salto vertical

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Postural misalignment of knee such as hyperextended knees may compromise postural control during vertical jump. Therefore, the aim of this study was to analyze COP and lower limbs movements during vertical jump comparing individuals with hyperextended and aligned knees. Sixteen young and healthy women were analyzed during their maximal vertical jump using a MTI force plate. Subjects were classified as hyperextended (n=11) or aligned (n=5) knees according to clinical observation of knee angle. Subjects were asked to stand still on the force plate and then jump as high as possible. Kinematic data were acquired using a camera located in standardized position at the right side of the subject. Anatomical landmarks were placed at the right side at: 5º metatarsal, lateral malleolus, head of fibula and greater throcanter. The phase of preparation associated to the phase of propulsion was called in this study the phase of preparation. This phase was established based on the curve of angular velocity of the knee. Landing was analyzed in the first, second and third second immediately after landing. COP-AP, VM-AP, COPML and VM-ML were calculated. Kinematic parameters were maximum and minimum ankle and knee angle and angular velocity. Intergroup comparison was carried using Mann-Whitney Test (p<0.05). Intergroup comparison was carried using Friedman Test followed by Wilcoxon Test (p<0.05). This study revealed that subjects with hyperextended knee present different postural control compared to the subjects with aligned knees while performing a vertical jump. During the phase of preparation subjects with hyperextended knees revealed higher angle of knee extension and lower COP-ML displacement. During the phase of landing subjects with hyperextended knees present higher angle of knee extension and lower angle of knee flexion requiring lower displacement of COP-ML when compared to subjects with aligned knee

ASSUNTO(S)

joelho vertical jump posture postura knee salto vertical mulheres women

ACESSO AO ARTIGO

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