fa آسیب شناسی ورزشی و حرکات اصلاحی Sport injury and corrective exercises پژوهشي Research The purpose of this study was examined effect of neck muscles fatigue on dynamic balance control in athlete and non-athletes females. 48 healthy females (24 athletes and 24 non-athletes) in 4 athlete and non-athlete control and experimental groups for 3 easy and 3 difficult directions of SEBT ( with age:22/33±1/54 years, weight:57/15±6/52 km, height: 162/37± 5/04cm) participated in this study. We measured dynamic balance control by star excursion balance test (SEBT). For produce fatigue in neck muscles, subject repeated to elevate her shoulders (until Borg scale=15) while hold a dumbbell with 30% of her 1RM. We used ANOVA and Tukey for data analysis (P≤0.05). The results showed a significant different between balance of 4 groups after the neck muscle fatigue in difficult directions (P꞊0/0001, F=12/51,) and easy directions (P꞊0/0001, F=10/13)and the reach distances decreased after the fatigue protocol in experimental groups. Therefore we suggest to coaches that note for increase the neck muscles endurance. Balance, fatigue, Star excursion balance test, ratings of perceived exertio 40 45 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-133-1&slc_lang=fa&sid=1 ali asghar norasteh علی اصغر نورسته asgharnorasteh@yahoo.com No دانشگاه گیلان najmeh barati نجمه براتی No nader rahnama نادر رهنما No دانشگا اصفهان sareh shahheidari ساره شاه حیدری s_shahheidary@yahoo.com Yes دانشگاه گیلان