COACHING & SPORT SCIENCE REVIEW The Offcial Tennis Coaching and Sport Science Publication of the International Tennis Federation 27th Year, Issue 78, August 2019 www.itftennis.com/coaching/sportsscience ISSN: 2225-4757 CONTENTS ISSUE 78 Pg. Title / Author 2 Editorial 3 Other oriented perfectionism in tennis coaching John Hollowell, Richard Buscombe and Andy Preston (GBR) 6 Characteristics of the return in professional women's clay court tennis Rafael Martínez-Gallego and Arnau Giner (ESP) 10 The hidden injury. Updating awareness of the latest research of concussion in tennis Alan Pearce and Janet Young (AUS) 13 Developing shoulder-over-shoulder rotation in the serve Elson Longo and Lucas Peres Rodrigues (BRA) 16 ITF Report: the state of the game 2018 Jamie Capel-Davies and James Spurr (ITF) 21 The effect of tactical periodization and traditional periodisation on the technical effectiveness and intermittent recovery of university tennis players Diego Polanco Bustos and Nelson Mariño Landazábal (COL) 25 Mini-Ballschool for children 3 to 6 years old Michael Ebert (AUT) 28 Plantar pressures differences between fat, slice and topspin serves Christos Mourtzios, Eleftherios Kellis and Konstantinos Salonikidis (GRE) 31 Energy expenditure differences between the 5 types of modern tennis players Fabrizio Senatore and Roberto Cannataro (ITA) 35 A practical proposal for the development of rhythm in tennis players Santiago Micó and Rafael Martínez-Gallego (ESP) 38 Recommended e-books Editors 39 Recommended web links Editors 40 General guidelines for submitting articles to ITF Coaching & Sport Science Review Editors