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스포츠심리학 : 골프 칩샷 기술의 제어 특성: Normalized jerk의 적합성
Movement control of chip shot in golf: The validation of normalized jerk
박승하(SeungHaPark) , 이승민(SeungMinLee)
UCI I410-ECN-0102-2021-600-000138510

The normalized jerk, absolute jerk standardized relative to movement time and distance, have been accepted as the index of smoothness for evaluating the quality of movement in single- and/or planar two-joint movement. The purpose of this study was to determine if the variable of normalized jerk is appropriate as index of the movement smoothness in performing complex sport task such as chip shot in golf. We calculated the normalized jerk value of two end-points, the left wrist and the toe of club's head, and examined it's difference as function of skill level and hits/misses. Eighteen golfers, 9 experts and 9 non-experts, participated in the study. Each participant performed the chip shot at 8m distant from the hole until getting at least three hits and three misses. The results indicated the downswing of expert golfers was faster than that of non-expert golfers, but there were no differences in the swing duration between two skill levels in backswing and follow through. The normalized jerk value of left wrist was lower than that of club's head, regardless of swing phases. From the results of normalized jerk across swing phases, we confirmed expert golfers characterized the smoothness of movement in downswing among swing phases, and that the smoothness of swing in y- and z-direction was important for successful chip shot. In conclusion, we suggest that the variable of normalized jerk can be used as the index of smoothness in complex sport skill, but we should to step the process for identifying the validity of normalized jerk by the further studies.

Ⅰ. 서론
Ⅱ. 연구방법
Ⅲ. 연구결과
Ⅳ. 논의
Ⅴ. 결론 및 제언
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