Influence of the psoas major and thigh muscularity on 100-m times in junior sprinters.
Med Sci Sports Exerc
; 38(12): 2138-43, 2006 Dec.
Article
em En
| MEDLINE
| ID: mdl-17146321
ABSTRACT
PURPOSE:
This study aimed to investigate how the cross-sectional areas (CSA) of the quadriceps femoris (QF)3, hamstrings (Ham), and psoas major (PM) in junior sprinters are related to mean running velocity (MV100m) calculated from official records of 100-m races.METHODS:
In 44 sprinters (22 boys and 22 girls) aged 14-17 yr, cross-sectional images were taken at the upper thigh and midthigh and midway between the fourth and fifth lumbar vertebrae using magnetic resonance imaging. CSA of the three muscles located in both sides were analyzed. For each muscle, the mean values of the CSA of the right and left sides were calculated and used for regression analyses of the relationships between CSA variables and MV100m.RESULTS:
Stepwise multiple-regression analyses produced prediction equations of MV100m with independent variables of QF CSA at the midthigh and PM-to-QF CSA ratio at the upper thigh for boys (R = 0.38) and PM-to-QF CSA ratio at the midthigh for girls (R = 0.33). In the regression model for boys, QF CSA at the midthigh had a negative regression coefficient.CONCLUSION:
For junior sprinters of both genders, the higher development of PM relative to QF, rather than absolute muscle size, is a factor in achieving a better performance in 100-m race performance.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Corrida
/
Músculo Esquelético
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Adolescent
/
Female
/
Humans
/
Male
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article