Association of Trunk Rotational Velocity with Spine Mobility and Curvatures in Para Table Tennis Players

Abstract

This study investigates the relationship of trunk rotational velocity with mobility and curvature of the spine in wheelchair table tennis players. Eleven para table tennis players and 13 able-bodied athletes performed 5 seated trunk rotations to each side with 1 kg barbell placed on the shoulders. Trunk rotational velocity and respective angular displacement were significantly lower in para table tennis players compared to able-bodied athletes. Both groups showed similar values of thoracic kyphosis. However, para table tennis players exhibited lower lumbar inversion and pelvic retroversion compared to able-bodied athletes. Peak and mean velocity in the acceleration phase of trunk rotation correlated with angular displacement in both para table tennis players (r=0.912, p=0.001; r=0.819, p=0.013) and able-bodied athletes (r=0.790, p=0.026; r=0.673, p=0.032). These velocity values were also associated with lumbar curvature (r=-0.787, p=0.003; r=− 0.713, p=0.009) and pelvic tilt angle (r=0.694, p=0.014; r=0.746, p=0.007) in para table tennis players. Findings indicate that slower velocity of trunk rotations in para table tennis players might be due to their limited range of trunk rotational motion. Decreased posterior concavity could also contribute to these lower values. However, other biomechanical factors may have an impact on the association between these variables and have yet to be documented.

Key words

able-bodied athletes - angular displacement - thoracic and lumbar spine - velocity of trunk rotation - wheelchair athletes

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