Soccer balls such as the Adidas Roteiro that have been used in soccer tournaments thus far had 32 pentagonal and hexagonal panels. Recently, the Adidas Teamgeist II and Adidas Jabulani, respectively having 14 and 8 panels, have been used at tournaments; the aerodynamic characteristics of these balls have not yet been verified. Now, the Adidas Tango 12, having 32 panels, has been developed for u...

The coaching carousel or turnover is an extreme but frequently occurring phenomenon in soccer. Among the reasons for firing a coach, the most common is the existence of a shock-effect: a new coach would be able to motivate the players better and therefore to improve results. Using data from the Spanish Soccer League during the seasons from 1997-1998 to 2006-2007, this paper investigates the rel...

The present study aimed to examine the independent and interactive effects of match location, match status, and quality of opposition on regaining possession, analysed by the type and zone of ball recovery, in matches played in the 2011-2012 UEFA Champions League. Twenty-eight matches of the knockout phase were evaluated post-event using a computerized notational analysis system. Multinomial lo...

The purpose of this study was to determine whether male and female soccer (football) referees would execute the Laws of the Game despite players' verbal abuse. Law 12 (Fouls and misconduct) instructs the referees as to how they should react when a player, substitute or substituted player expresses a swear word. The player should be issued a red card. Referees (n = 113) were presented with 28 sw...

conclusions there was a higher incidence of genu varum in soccer players than in control adolescents; the stress and load imposed on the knee joint led to more severe genu varum. results both soccer players and controls had genu varum. however, the incidence of genu varum was higher in the soccer players (p = 0.0001) and it was more prevalent in the 16-18 year age group (p = 0.0001). the result...

Introduction: Dynamic knee valgus and poor technique during landing are not only key risk factors for lower extremity injuries especially knee injury, it also can reduce performance. Sportsmetrics soccer training is one of the successful knee injury prevention and enhancement performance protocols in female soccer players. But, the effect of Sportsmetrics soccer training has not been investigat...

this study represents an attempt to determine the prevalence of exercise-induced bronchospasm among soccer player children. a total of 234 soccer player boys of all soccer schools from shahr-rey enrolled in this study. they did not have any history of a recent or chronic respiratory tract disease, a history of allergic diseases, and history of bronchodilator drugs consumption during the 24 hour...