title: Contribution of trunk muscularity on sprint run.
abstract: This study aimed to investigate how the trunk muscularity is related to sprint running performance. In 23 youth soccer players, the cross-sectional images at the mid level of each of L1-L2, L2-L3, L3-L4, L4-L5, and L5-S1 were obtained using magnetic resonance imaging to determine the cross-sectional areas (CSAs) of rectus abdominis, oblique, psoas major, quadratus lumborum and erector spinae muscles. The times taken to sprint over 20 m were measured, and the mean velocity of running was calculated for each of the 2 distances (V (10 m) and V (20 m)) and for the distance from 10 m to 20 m (V (10-20 m)). The CSA values of the 5 slice levels for all muscles except for the quadratus lumborum and those of the 3 slice levels (L1-L2, L2-L3 and L3-L4) for the quadratus lumborum were averaged and expressed relative to the two-third power of body mass (CSA/BM (2/3)). The CSA/BM (2/3) values of the erector spinae and quadratus lumborum were selected as significant contributors to predict V (10 m) ( R(2)=0.450), V (20 m) ( R(2)=0.504) and V (10-20 m) ( R(2)=0.420). The current results indicate that the muscularity of the erector spinae and quadratus lumborum contributes to achieving a high performance in sprint running over distances of less than 20 m.
authors.affiliation: University of Tokyo, Life Sciences (Sports Sciences), Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kubo
authors.forename: Y
authors.initials: Y
authors.lastname: Hoshikawa
authors.forename: M
authors.initials: M
authors.lastname: Muramatsu
authors.forename: T
authors.initials: T
authors.lastname: Iida
authors.forename: S
authors.initials: S
authors.lastname: Komori
authors.forename: K
authors.initials: K
authors.lastname: Shibukawa
authors.forename: H
authors.initials: H
authors.lastname: Kanehisa
mesh_terms: D000005:Abdomen / Q000502:physiology; D000293:Adolescent; D001415:Back / Q000033:anatomy & histology* / Q000502:physiology*; D001823:Body Composition / Q000502:physiology; D017079:Exercise Tolerance / Q000502:physiology; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D012420:Running / Q000502:physiology*; D012916:Soccer / Q000502:physiology; D013223:Statistics as Topic; D013647:Task Performance and Analysis