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姿勢穩定性與單手接球的關係

The Relationship between Posture Stability and One-hand Catching

摘要


The purpose of this study was to explore the relationship between postural stability and one-hand catching from the perspective of relative proficiency of the two motor skills and the influence of the secondary task. Nine right-handed and one left-handed female college students majoring in physical education without prior experience in standing on the stabilometer participated in this study. All the participants practiced on the stabilometer 20 trials a day (each trial lasted for 30 seconds), 3 days a week for 4 weeks. Balancing time and number of balls caught were examined for the pre-test, mid-test, post-test and one-month retention-test, which included standing on the stabilometer only and those plus one-hand ball-catching (with preferred and non-preferred hand). The movements of the stabilometer were captured by a PhaseSpace motion digitizing system to derive the frequency and the amplitude of the platform. The results were as following: 1. The balancing time significantly improved with practice, F(subscript (2.37, 21.29))=91.02, p<0.5, the continuing improved postural stability was observed through the addition of the secondary task of one-hand catching. 2. Although there was no difference between the preferred and non-preferred hand in the number of balls caught on the stabilometer at all tests, F(subscript (1, 9))=0.17, p=0.687, there were significantly more balls caught with non-preferred hand while standing on the ground than standing on the stabilometer at pre-test, t(subscript (9))=2.39, p<.05. 3. The frequency of the platform significantly increased and the amplitude significantly decreased after practice. To sum up, posture stability could be considered as a more skilled task when performing another task, and its importance required a secondary task to reveal. The less familiar skill would be easily subject to the perturbation of the imposed task when 2 tasks were asked to perform simultaneously. The improvement of the unfamiliar skill could lessen the perturbation effect of the imposed task.

並列摘要


The purpose of this study was to explore the relationship between postural stability and one-hand catching from the perspective of relative proficiency of the two motor skills and the influence of the secondary task. Nine right-handed and one left-handed female college students majoring in physical education without prior experience in standing on the stabilometer participated in this study. All the participants practiced on the stabilometer 20 trials a day (each trial lasted for 30 seconds), 3 days a week for 4 weeks. Balancing time and number of balls caught were examined for the pre-test, mid-test, post-test and one-month retention-test, which included standing on the stabilometer only and those plus one-hand ball-catching (with preferred and non-preferred hand). The movements of the stabilometer were captured by a PhaseSpace motion digitizing system to derive the frequency and the amplitude of the platform. The results were as following: 1. The balancing time significantly improved with practice, F(subscript (2.37, 21.29))=91.02, p<0.5, the continuing improved postural stability was observed through the addition of the secondary task of one-hand catching. 2. Although there was no difference between the preferred and non-preferred hand in the number of balls caught on the stabilometer at all tests, F(subscript (1, 9))=0.17, p=0.687, there were significantly more balls caught with non-preferred hand while standing on the ground than standing on the stabilometer at pre-test, t(subscript (9))=2.39, p<.05. 3. The frequency of the platform significantly increased and the amplitude significantly decreased after practice. To sum up, posture stability could be considered as a more skilled task when performing another task, and its importance required a secondary task to reveal. The less familiar skill would be easily subject to the perturbation of the imposed task when 2 tasks were asked to perform simultaneously. The improvement of the unfamiliar skill could lessen the perturbation effect of the imposed task.

參考文獻


Angelakopoulos, G. T.,Davids, K.,Bennett, S. J.,Tsorbatzoudis, H.,Grouios, G.(2005).Postural Stability and Hand Preference as Constraints on One-Handed Catching Performance in Children.Journal of Motor Behavior.37,377-385.
Annet, J.(1985).Left, right, hand and brain: The right shift theory.London:Erlbaum.
Bayley, N.(1969).The Bayley scales of infant development.New York:Psychological Corporation.
Brown, I. D.(1962).Measuring the "spare mental capacity" of car drivers by a subsidiary auditory task.Ergonomics.5,247-250.
Bryden, M. P.,Singh, M.,Steenhuis, R. E.,Clarkson, K. L.(1994).A behavioural measure of hand preference as opposed to hand skill.Neuropsychologia.32,991-999.

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