イシムラ　カズヒロ   ISHIMURA, Kazuhiro   石村　和博 スポーツ科学部 スポーツ科学科 講師
言語種別	英語
発行・発表の年月	2016/08
形態種別	学術雑誌
査読	査読あり
標題	Asymmetry in Determinants of Running Speed During Curved Sprinting
執筆形態	共同
掲載誌名	JOURNAL OF APPLIED BIOMECHANICS
掲載区分	国外
出版社・発行元	HUMAN KINETICS PUBL INC
巻・号・頁	32(4),pp.394-400
担当区分	筆頭著者
著者・共著者	◎Kazuhiro Ishimura,Shinji Sakurai
概要	This study investigates the potential asymmetries between inside and outside legs in determinants of curved running speed. To test these asymmetries, a deterministic model of curved running speed was constructed based on components of step length and frequency, including the distances and times of different step phases, takeoff speed and angle, velocities in different directions, and relative height of the runner's center of gravity. Eighteen athletes sprinted 60 m on the curved path of a 400-m track; trials were recorded using a motion-capture system. The variables were calculated following the deterministic model. The average speeds were identical between the 2 sides; however, the step length and frequency were asymmetric. In straight sprinting, there is a trade-off relationship between the step length and frequency; however, such a trade-off relationship was not observed in each step of curved sprinting in this study. Asymmetric vertical velocity at takeoff resulted in an asymmetric flight distance and time. The runners changed the running direction significantly during the outside foot stance because of the asymmetric centripetal force. Moreover, the outside leg had a larger tangential force and shorter stance time. These asymmetries between legs indicated the outside leg plays an important role in curved sprinting.
DOI	10.1123/jab.2015-0127
ISSN	1065-8483/1543-2688
PMID	27046932