| Summary: | 碩士 === 國立體育學院 === 運動科學研究所 === 81 === The purpose of this study were (1) to find out the difference
be tween single Tkatchov and consecutive Tkatchov in different
kine matic data and angular momentum; (2) to investigate the
correlat ion between angular position of start beataction and
bar release ; and (3) to predict the possibility of performing
straight Tkat chov by native gymnasts. 17 gymnasts'' performance
were filmed at 60 frames per second during horizontal bar
competition in 4 game s . These gymnasts consisted of 5
international elite ones and 1 2 native ones. A two-dimensional
model of Peak Performance Syste m and a multi-linked rigid body
model with 8 pointsand 7 segment s were used to calculate the
kinematic data and angular momentum of the Tkatchov which for t-
test statistical analysis. Conclusio n of this study were as
follows: (1).Angular momentum at release (t=3.27,p<.01),
maximum horizontal displacement during the flig ht phase
(t=-2.5,p<.05),and raduis of rotation at regrasp (t=-3.
06,p<.01) were larger in the case of conse cutive Tkatchovthan
t hose in the case of single Tkatchov. It showed that the rapid
ex tension of shoulders and hips of consecutive Tkatchov was
more e fficient than that of single Tkatchov. (2).It was proved
that th ere was an significant corelation betweenangular
positions of st art beat action and bar release. It indicates
that when a gymnas t releases the bar at a higher position, his
position of start b eat actionshould be closer to the vertical
position under the ba r, and vice versa.(3).Thisstudy assured
the possibility to perfo rm the straight Tkatchov by the native
gymnasts. From kinematic data in the case of straight flying
over the bar, it wasfound th at 2 gymnasts who performed single
Tkatchov could not accomplsh this action because their vertical
velocitiies of c.g. at bar re lease were not sufficient, but if
they adjust their release posi tion, then they could accomplish
it.Those three gymnasts who per formed consecutive Tkatchov
could easily accomplish
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