BUTTON, C, DAVIDS, K, BENNETT, S J and TAYLOR , M A (2000). Mechanical perturbation of the wrist during one-handed catching. Acta Psychologica, 105 (1), 9-30.Full text not available from this repository.
In the present study, the co-ordination of grasp and transport components of one-handed catching was examined following mechanical perturbations applied to the wrist. Six skilled catchers (mean AGE=27.5 years) performed 64 trials in which tennis balls were projected at approximately 8 m s−1. The trial blocks consisted of 10 non-perturbed trials (NPTs) (baseline), and a block of 54 trials of which 20 trials were perturbed. The perturbation was in the form of a resistive force (12 N) applied via a piece of cord attached to a mechanical brake. In baseline trials participants reached maximal wrist velocity closer to the time of hand–ball contact (237 ms ± 68) than in the perturbed (309 ms ± 61) condition. Furthermore the wrist velocity profile of five out of six participants exhibited a double peak immediately after a perturbation. However, aperture variables such as the relative moment of final hand closure (approximately 70% of overall movement time) were not typically affected. The stability of grasp and transport coupling for one-handed catching was shown to vary from trial to trial. Skilled performers exploited redundant degrees of freedom in the motor system when faced with a sudden, unexpected change in task constraints.
|Research Institute, Centre or Group:||Centre for Sports Engineering Research|
|Depositing User:||Carole Harris|
|Date Deposited:||19 Apr 2011 08:43|
|Last Modified:||19 Apr 2011 08:43|
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