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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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THE RELATIONSHIP BETWEEN PERFORMANCE AND TRUNK MOVEMENT DURING CHANGE OF DIRECTION |
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Shogo Sasaki1,2  ,
Yasuharu Nagano3, Satoshi Kaneko3, Takakuni Sakurai2
and Toru Fukubayashi3 |
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1Graduate School of Sport Sciences, Waseda University, Saitama, Japan, 2Faculty of Health Sciences, Tokyo Ariake University of Medical and Health Sciences, Tokyo, Japan, 3Faculty of Sport Sciences, Waseda University, Saitama, Japan |
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© Journal of Sports Science and Medicine (2011) 10, 112 - 118 |
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| ABSTRACT | |||
| The purpose of this study was to obtain the trunk kinematics data
during a change-of-direction task and to determine the relationship between
trunk kinematics and the change-of-direction performance. The design of
this investigation was a descriptive laboratory study. Twelve healthy male
collegiate soccer players (age: 21.3 ± 1.0 yrs, body mass: 67. 7 ± 6.7 kg,
and height: 1.75 ± 0.05 m) participated in this study. Participants performed
a shuttle run cutting task with a 180 degree pivot as quickly as possible.
The shuttle run cutting time, ground contact time during a change-of-direction,
and trunk inclination angle were measured. The shuttle run cutting time
tends to correlate positively with ground contact time. During the change-
of-direction task, the trunk forward inclination angle gradually increased
during the first 50% of the stance phase and decreased subsequently whereas
the trunk flexed, maintaining a left inclination during the first 40% of
the stance phase and changing exponentially in the opposite direction. Forward
angular displacement of the trunk between foot-contact and maximum trunk
inclination correlated positively with the shuttle run cutting time (r =
0.61, p < 0.05) and ground contact time (r = 0.65, p < 0.05). These
findings suggest that the change-of-direction performance could be related
to the small angular displacement of the trunk during a change of direction.
Moreover, it was considered that there might be optimal inclination angles
related to change-of-direction performance. Therefore, coaches in field
sports should check body posture and trunk movements during changes of direction.
Key words: Kinematics, angular displacement, posture, stability, field sports. |
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