Kineziologija, Vol. 31 No. 1, 1999.
Izvorni znanstveni članak
The posture steadiness of running target shooters of different skill levels
J. T. Viitasalo
; Istraživački institut za olimpijske sportove, Jyväsylä, Finska
P. Era
; Metitur Ltd, Jyväsylä, Finska
N. Konttinen
H. Mononen
; Istraživački institut za olimpijske sportove, Jyväsylä, Finska
K. Mononen
; Istraživački institut za olimpijske sportove, Jyväsylä, Finska
K. Norvapalo
; Istraživački institut za olimpijske sportove, Jyväsylä, Finska
E. Rintakoski
; Finska streljačka udruga, Helsinki, Finska
Sažetak
The present study was designed to investigate the interrelationships between 1) the movement of the centre point of forces in a supporting surface while standing with the eyes open, closed and during aiming, 2) the oscillation of the aiming point and 3) the shooting score among running target shooters with heterogeneous a shooting training background. Running target shooting is an Olympic event in which a moving target runs at a distance of 10 m through a 2 m-wide shooting area in 5 seconds (slow run). Twenty male subjects volunteered for the study: 6 were national and international level running target shooters, 6 regional level running target shooters and 8 hunters with no systematic shooting training background. The testing protocol consisted of measurements of oscillations of the centre point of forces (OCPF) in laboratory conditions on a force platform while the subjects stood with eyes open and closed, and during shooting. The (CPF) was defined as the result of all of the reaction forces applied to the supporting surface by a standing subject trough his or her feet. An optoelectronic device (Noptel ST-2000) was used to register the shooting score and oscillation of the aiming point around the target.
The running target score was found to be better, the oscillation of aiming smaller and OCPF less among the trained shooters than among the less trained hunters. In the normal upright standing position with eyes open and closed the trained shooters also produced smaller OCPF. The increase in OCPF from standing with the eyes open to the aiming condition was smaller for the trained shooters than for the hunters. When all the subjects were treated as a single group the score was strongly explained (74.8%) by the vertical oscillation of aiming, OCPF during aiming, the difference in OCPF between standing with the eyes open and during aiming, and stature. It was concluded that the movements of the rifle during aiming (oscillation of aiming, visual feedback) and the control of the body's upright position during aiming (OCPF, proprioceptive and vestibular feedback) are relatively independent factors explaining well the shooting score among shooters with heterogeneous shooting training backgrounds.
Ključne riječi
balance, postural stability, postural sway, standing stability
Hrčak ID:
256643
URI
Datum izdavanja:
28.4.1999.
Posjeta: 344 *