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• Nan yon etid sou 13-14 ane fin vye granmoun foutboleur spanish, rezilta tès Yo-Yo alan soti nan 13.1 pou yon sant fullbacks 14.46 pou milyeu lajè (Evalyasyon nan aspè antropometrik ak fizyolojik nan 13-14 ane fin vye granmoun foutboleur Panyòl, pa Juan Bautista Castilla Arroyo)
eng
• In a study of 13-14 year old spanish footballers, yo-yo test results ranged from 13.1 for centre fullbacks to 14.46 for wide midfielders (Assessment of anthropometric and physiological aspects of 13-14 years old Spanish footballers, by Juan Bautista Castilla Arroyo)