Amiri-Khorasani, M, Abu Osman, NA, and Yusof, A. Acute effect of static and dynamic stretching on hip dynamic range of motion during instep kicking in professional soccer players. J Strength Cond Res 25(6): 1647–1652, 2011—The purpose of this study was to examine the effects of static and dynamic stretching within a pre-exercise warm-up on hip dynamic range of motion (DROM) during instep kickin...

BACKGROUND No study has investigated whether newcomers to professional soccer have a different injury rate than established players. PURPOSE The primary objective was to investigate whether being a newcomer to professional soccer influences injury rates. The secondary objective was to evaluate whether playing position and player age influence injury rates. STUDY DESIGN Cohort study; Level o...

OBJECTIVE To evaluate the social, economic and health aspects related to former professional soccer players in Brazil. METHODS This was a cross-sectional study with the participation of 100 male Brazilian former professional soccer players. For characterization of the sample variables such as age, current and past weight, height, BMI (Body Mass Index) and player position were evaluated. In al...

OBJECTIVE The objective of this study was to conduct a comparative analysis on isokinetic strength assessments between field and indoor male professional soccer players and correlate the findings with the higher levels of injury risk described in the literature. METHODS We analyzed 16 field soccer players and 15 indoor soccer players. All these professionals were male. Isokinetic muscle stren...

OBJECTIVES To identify the intrinsic risk factors of non-contact strains in the hamstrings and quadriceps muscles of professional soccer players via a cohort prospective design. METHODS A total of 100 professional soccer players (aged 19.4-27.8 years) from four professional teams underwent a composite musculoskeletal assessment at preseason. Intrinsic risk factors included dichotomies of asym...

Heart rate variability (HRV) has been increasingly used to monitor team sports athletes. Besides the traditional time domain indices (i.e., the SD of successive RR intervals [SDNN] and the root mean square difference of successive normal RR intervals [RMSSD]), recently the use of the stress score (SS), which is an inverse function of the SD2 index derived from the Poincaré plot, and the sympath...

This prospective study was designed to identify psychological factors that predict career success in professional adult soccer. Post hoc, two groups were distinguished: (1) Male soccer players who successfully progressed into professional adult soccer (n = 18) and (2) Male soccer players who did not reach this level (n = 47). Differences between the two groups were examined on the basis of data...

The aim of this study was to test the hypothesis that high levels of testosterone during prenatal life, testified by a low second-to-fourth digit ratio (2D:4D), as well as in adulthood affect the aggressive behavior of professional soccer players. Using 18 male professional players from a first level Italian Soccer Team we calculated: i) the 2D:4D ratio of the right hand, ii) the number of yell...

OBJECTIVE To compare the magnetic resonance imaging findings from the pubis of professional soccer players without any history or clinical findings of groin pain, and from sedentary individuals, also without symptoms, and to determine the prevalence of changes compatible with pubic overload. METHODS Nineteen professional soccer players without complaints of groin pain and seventeen sedentary ...