| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2004: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2003: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Research Abstract |
Bilateral deficit, also known as bilateral deficit in movement speed, has been defined as a reduction in force that accompanies maximal two-limb efforts of the homologous limbs relative to single performance ; that is, the reaction time(RT) is longer for simultaneous bilateral responses than for unilateral ones. Although we know that this phenomenon is mediated by neural mechanisms such as interactions between the cerebral hemispheres or spinal reflexes, the underlying mechanism is still far from clear. The purpose of this study was to examine bilateral deficit in children whose nervous system was not yet completely mature, and to clarify the developmental characteristics of bilateral and unilateral movements.
Subjects (aged 6-11 children) were asked to perform a RT task by a handgrip either by a single hand or by both hands in response to auditory stimuli. The RT and grip strength ware measured in each trial.
The results are as follows. The bilateral deficit phenomenon was not notably o
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bserved compared with the adult by the child as same as previous reports. By those children, nerve bunches, such as a corpus callosum which connects the both sides of a cerebrum, are still mature phases, and this was considered that it is one factor that the exchange of a right-and-left hemisphere is underdeveloped. Moreover, a possibility that facilitative function, such as ipsilateral pathway, was working in predominance rather than the integration and the mutual inhibition between the cerebral hemispheres.
In present study, it was presumed that facilitation rather than inhibition occurred in the children as they carried out a bilateral simultaneous movement, that is, a kind of maximal effort when they responded as fast as possible. I hypothesized that different mechanisms may be responsible for fast bilateral movement in children.
These results ware reported at the academic meeting of International Society of Biomechanics(2003.7), Japanese Society of Growth and Development(2004.3), and as an article of Bulletin of Institute of Physical Education, Keio University(2005.1) Less
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