comparison the effects of short and long-term static warm up on balance indices and motor performance in gymnast athletes

methods in this study, 16 skilled female gymnasts (mean age of 9.62 ± 1.45 years) were randomly categorized to two general warm-up with no stretching (ns, n=8) and general warm-up plus static stretching (ss, n=8) groups. the warm-up protocol included a 10-minute jogging, and the static stretch (ss) protocol included stretching programs on the different parts of body during four weeks, three times a week. the stretched body parts were the hamstrings, the gluteus, the quadriceps and hip flexors, and the lower back and shoulder. each body part was stretched two times to the point of slightly painful yet tolerable muscle discomfort, for the duration of 15 seconds. before and after acute protocol and also after four weeks, the indicators of the equilibrium of anterior-posterior and internal-external pressure fluctuations range, and track length of the anterior-posterior and internal-external pressure center were evaluated by a force plate in four static and dynamic unilateral and bilateral standing positions. results results of this study showed that static stretching has a significant effect on decreasing in the performance of balance during vault activity in the chronic compared to acute phase (p = 0.001). the results also revealed that there was no significant difference in static and dynamic balance with bilateral standing in the ns group in the acute phase compared to the chronic phase (p ≥ 0.05). however, dynamic balance during unilateral standing in the sw group was significantly decreased after four weeks (p = 0.001). conclusions the results may indicate that long duration static stretch exercises can improve static balance during bilateral and unilateral standing in gymnast athletes, yet on the other hand, long duration static stretch exercises may disturb the function of the dynamic balance and so may cause sport injuries in athletics. objectives the aim of this study was to investigate the effects of short and long-term static warm up protocol on static and dynamic balance and motor performance in gymnast athletes.