Journal of Japanese Society for Mastication Science and Health Promotion
Online ISSN : 1884-4448
Print ISSN : 0917-8090
ISSN-L : 0917-8090
[title in Japanese]
Yasuhiro MURAOKAShin-ichirou TAKASUGIToshiyuki KIHARAKoudou OTOKIMasayoshi TAKEDAMakoto YASUNAGA
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2000 Volume 9 Issue 2 Pages 72-76

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Abstract

In a stretch-shortening cycle exercise (SSCE) the concentric musle action is enhanced by a preceding eccentric muscle action. The present study based upon analysing the change of SSCE under malocclusion that artificialy created partial mouthpiece at the molar, aming at the linkages among the following three fields: oral science, neurophysiology and physical response. The subjects were eight american footboll players. We measured isokinetic muscular strength with partial mouthpiese and without it. Concentric and eccentric isokinetic muscular strength of the planter flection at ankle joint were measured by using MYORET-RZ450.
The results are summarized as follows:
1. The values of eccentric contraction were not change in SSCE (eccentric contractio at the rate of 180 degree/sec. preseding concentric contraction at the rate of 60 degree/sec.) neither by mounting partial mouthpiece and without it.
2. But the values of concentric contraction satifically incresed in SSCE (eccentric contraction at the rate of 180 degree/sec. preseding concentric contraction at the rate of 60 degree/sec.) both with mounting mouth pieace nor without it. And this value was found also satifically diferece at after second cycle between with mounting mouth pieace and without it.
3. The value of concentric contraction in SSCE (at the rate of 300 degree/sec. preseding concentric contraction at the rate of 180 degree/sec.) were not changed after at second cycle between with mounting mouth pieace and without it.

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