Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2011) 10, 112 - 118

Research article
The Relationship between Performance and Trunk Movement During Change of Direction
Shogo Sasaki1,2, , Yasuharu Nagano3, Satoshi Kaneko3, Takakuni Sakurai2, Toru Fukubayashi3
Author Information
1 Graduate School of Sport Sciences, Waseda University, Saitama, Japan
2 Faculty of Health Sciences, Tokyo Ariake University of Medical and Health Sciences, Tokyo, Japan
3 Faculty of Sport Sciences, Waseda University, Saitama, Japan

Shogo Sasaki
✉ Graduate School of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192 Japan
Email: sasaki@tau.ac.jp
Publish Date
Received: 30-09-2010
Accepted: 17-11-2010
Published (online): 01-03-2011
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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


           Key Points
  • Small forward angular displacement of the trunk during a direction change is related to the change-of-direction performance.
  • Trunk stability during a change of direction is an important factor in the change-of-direction performance.
  • There might be a range of optimal angles of trunk inclination during a change of direction.
  • Coaches in field sports should check the body posture and trunk movement of players when they require a change of direction or when they participate in sport-specific change-of-direction training.
 
 
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