530 RESULTS: Before training, students achieved a mean MJC of 93+98 jumps, with a range of 2-459 jumps. A negative correlation was observed between MJC in before training and ST (r=-0.46, p<0.01). Additionally, positive correlations were observed between it and RJI (r=0.57, p<0.01), VJ (r=0.33, p<0.01) and GS (left-hand: r=0.31, p<0.01; right hand: r=0.34, p<0.01). Four weeks of training resulted in significant improvements in MJC (+43%, p<0.001), RJI (+7%, p<0.05), and VJ (+5%, p<0.01). However, jump rope exercise frequency did not result in any apparent differences in training effects. CONCLUSIONS: These results suggest that MJC was associated with a variety of physical abilities in elementary school students. However, it could not be clearly demonstrated that jump rope training improve performance indicators related to SSC ability in elementary school students. 2184 Board #20 June 1 9:30 AM - 11:00 AM A Comparison Of Health Related Fitness Variables Between The Youths Of Singapore And Bangkok Govindasamy Balasekaran, FACSM 1 , Stanley Sai-Chuen Hui, FACSM 2 , Kallaya Kijboonchoo 3 , Visvasuresh Victor Govindaswamy 4 , Jolene Lim 1 , Ng Yew Cheo 1 , Peggy Boey 1 . 1 Nanyang Technological University, Singapore, Singapore. 2 The Chinese University of Hong Kong, Shatin, Hong Kong. 3 Institute of Nutrition, Mahidol University, Salaya, Thailand. 4 Concordia University Chicago, Chicago, IL. (No relevant relationships reported) Obesity is identified as a worldwide issue and thus assessing health related components of physical fitness in youths may help in identifying risk factors associated with obesity. PURPOSE: To compare fitness variables between the youths of Singapore (SGP) and Bangkok (BKK). METHODS: A sample of 1559 (Age: 13.49 ± 1.21 yrs; Height: 159.76 ± 8.94 cm; Weight: 51.91 ± 13.38 kg) youths from SGP and 1098 (Age: 13.95 ± 0.85 yrs; Height: 158.88 ± 7.98 cm; Weight: 53.01 ± 14.13 kg) youths from BKK were recruited for this study. Body composition was measured using a bio-impedance analysis (BIA) machine. A one-legged sit-and- reach test for both legs (SRT), handgrip strength test for both hands (HST), sit-up test (SUT), and 15m youth Progressive Aerobic Cardiovascular Endurance Run (PACER) test was conducted to measure flexibility, arm strength, abdominal endurance, and cardiorespiratory endurance respectively. RESULTS: There was a significant difference in body composition between the youths in SGP and BKK, as indicated by their body mass index (SGP: 20.19 ± 4.21 kg.m -2 , BKK: 20.85 ± 4.64 kg.m -2 , p < 0.0005) and body fat percentage (SGP: 21.51 ± 10.25 %, BKK: 23.43 ± 11.23 %, p < 0.0005). Significant differences were found between the youths of both countries for SRT for both legs (SGP: 108.27 ± 20.31 cm, BKK: 103.59 ± 18.25 cm, p < 0.0005), HST for both hands (SGP: 50.32 ± 15.53 kg, BKK: 52.20 ± 12.72 kg, p = 0.001), SUT (SGP: 38.94 ± 11.92, BKK: 27.19 ± 9.72, p < 0.0005), and PACER (SGP: 40.93 ± 23.90 laps, BKK: 30.37 ± 16.26 laps, p < 0.0005). CONCLUSIONS: The youths of SGP had lower body composition, were more flexible, had higher abdominal endurance, and were more aerobically fit compared to the youths of BKK. This indicated a lower risk of obesity and cardiovascular risk in SGP youths as compared to BKK. More research is needed to identify the reasons for these differences which may help youths to continue participating in high levels of physical activity and exercise to reduce cardiovascular risks. 2185 Board #21 June 1 9:30 AM - 11:00 AM Assessment Of Quality Of Movement Patterns In Spanish Pediatric Population During Classes Of Physical Education Miguel García-Jaén 1 , Juan M. Cortell-Tormo 1 , Iván Chulvi-Medrano 1 , Sergio Selles 1 , Roberto Cejuela 1 , Tamara Rial 2 . 1 University of Alicante, Alicante, Spain. 2 International Hypopressive and Physical Therapy Institute, Vigo, Spain. (No relevant relationships reported) The Functional Movement Screen(FMS) test has become increasingly popular as a tool designed to evaluate the quality of fundamental whole-body movement patterns, for the assessment of the normal function and for identifying limitations and asymmetries in basic functional movements. Although there are already considerable data analyzing FMS outcomes in adults, this research is currently scarce in pediatric population. PURPOSE: This exploratory and descriptive study was undertaken to evaluate the physical functional capacity in school-aged pediatric population, in order to assess the prevalence of asymmetries and confirm feasibility of performing the FMS in a sample of children from Spanish primary school. METHODS: 136 elementary school children, 69 girls and 67 boys between 8-13 years old, took part in this investigation (age: 9.96 ± 1.22 years, weight: 39.21 ± 7.01 kg, height: 1.35 ± 0.097 m, BMI: 21.36 ± 2.69). Each participant performed the FMS during the classes of Physical Education in a primary school of Spain. Throughout data collection, information was digitally recorded for later data analysis. Statistical analysis was made using a two-way ANOVA with repeated measures. RESULTS: Obtained results showed that girls scored highest in all the FMS tests, compared with boys (14.38±3.078 vs. 11.91±2.58) and these outcomes indicate significant differences between both genders, throughout all studied age range (P = 0.000). The mean of total FMS score from all the study participants was 12.76±2.89. CONCLUSION: Girls presented higher quality of fundamental movement skills than boys, which indicates more optimal function, and boys scored lowest, which indicates lower quality of basic movement patterns and, therefore, higher prevalence of limitations and asymmetries. The low values of total FMS scores in both genders showed throughout all the age range studied indicate suboptimal physical functional capacity and high prevalence of asymmetries. Finally, the results of this study highlight that FMS can be a feasible screen test for evaluating functional movement skills and asymmetries in pediatric population, in order to reduce the risks of orthopaedic abnormality arising from suboptimal movement patterns in adult lifespan. 2186 Board #22 June 1 9:30 AM - 11:00 AM Impact of Flag Football Intervention on Fitness Outcomes among 9-11 Years Old Chinese Children Jie Zhuang 1 , XinZhao Cao 1 , Peijie Chen 1 , Yong Gao 2 . 1 Shanghai University of Sport, Shanghai, China. 2 Boise State University, Boise, ID. (Sponsor: Weimo Zhu, FACSM) (No relevant relationships reported) PURPOSE: To examine the impact of a 10-week flag football intervention on aerobic fitness, muscular strength and speed among 9-11 years old Chinese children. METHODS: A total of 122 9-11 years old Chinese children were randomly divided into intervention group (IG; n=62) and control group (CG; n=60). The IG received ten- week flag football (FF) lessons (60-90 mins per lesson, twice a week), including throwing and catching balls, positioning, attacks,defending, game rules and games while CG took conventional PE lessons (35 mins per lesson, 3 times a week). Participants took 20-m shuttle run (20-m SRT), jump rope (for muscular power) and 50-meter dash (for speed) tests before and after intervention. VO 2max was estimated from 20-m SRT using Pacer equation. Mixed model Repeated Measures ANOVAs were used for data analysis. RESULTS: A significant group-by-time interaction was observed for jump rope test (turns/min), p=0.03: no difference between IG and CG at baseline, but jump rope performance was significant improved among IG while no change among CG after intervention. There was also a significant group-by-time interaction for 50-meter dash (in sec), p=0.013: no difference at baseline between IG and CG, but 50-meter dash performance improved among IG while no change in CG after intervention. Although VO2max and 20-m SRT scores of both IG and CG participants increased from baseline to after intervention, there was no group difference in the improvement, p>0.05. Copyright © 2018 by the American College of Sports Medicine. Unauthorized reproduction of this article is prohibited.