1. Purpose: The purpose of this experiment was to compare the strength of the right quadriceps and hamstring muscles of soccer players in the forward (F) and defense (D) positions. Methods: The Biodex machine was used to test the strength of the soccer players’ right legs. Age, height and weight and heart rate were recorded. Body fat was measured at three sites on each subject using skinfold calipers (chest, abdomen, thigh). Prior to the testing on the Biodex, each subject was fitted with a heart rate monitor. Subjects then took a seat on the Biodex. The machine was adjusted according to the subject’s height and length of their right leg which was then strapped into position, then two straps were placed across the chest and one strap placed across the waist. The Biodex was set to allow extension and flexion at three speeds (90°/sec, 180°/sec, and 360°/sec) with four repetitions each. Between each speed there was a rest period of 60 seconds. SPSS was used to analyze potential differences between the variables. The alpha levels was set at p 0.05). Conclusion: There were no statistically significant differences in the leg strength between the forward position soccer players and the defensive position soccer players. However, the male subjects tested were recreational soccer players and these findings may be different in elite players. Brian Brunet, Dr. J. Wilson & Dr. M. Ricard Department of Kinesiology, University of Texas Arlington, Arlington, TX 76019 Soccer is a sport that is well known and played around the world. In the sport of soccer there are different positions such as forward, mid field, defense, and the goalie. The forward position soccer player’s main task is to kick the soccer ball into the opponent’s goal. The defense position soccer player’s role is to assist the goalie in not allowing the opposing players to score a goal. The mid fielders assist both the forward and defensive positions.. Right Leg Strength of Soccer Players With In Comparison of Forward And Defense Position ABSTRACTINTRODUCTION Methods Results Figure 2 Purpose 12 males who have played soccer within the past 2 years, volunteered to be subjects. The subjects were divided according to positions played: forward position (n=7, age = 23±2 yr, ht = 70 ± 4 in, wt = 173.8 ± 14.9 lbs, %bf = 19.3 ± 3.3) and defensive position (n=5, age = 23±3 yr, ht = 67 ± 2.5 in, wt = 153.3 ± 20.6, %bf = 18.9 ± 4.1). The variables that were analyzed which included peak power, average power, agonist/antagonist, and time to peak torque. Analysis included flexion/extension at each of the three speeds. None of the relationships were significant (p > 0.05). Conclusions There were no statistically significant differences in the leg strength between the forward position soccer players and the defensive position soccer players. However, the male subjects tested were recreational soccer players and these findings may be different in elite players. The purpose of this experiment was to compare the strength of the right quadriceps and hamstring muscles of soccer players in the forward (F) and defense (D) positions. The Biodex machine was used to test the strength of the soccer players’ right legs. Age, height and weight and heart rate were recorded. Body fat was measured at three sites on each subject using skinfold calipers (chest, abdomen, thigh). Prior to the testing on the Biodex, each subject was fitted with a heart rate monitor. Subjects then took a seat on the Biodex. The machine was adjusted according to the subject’s height and length of their right leg which was then strapped into position, then two straps were placed across the chest and one strap placed across the waist. The Biodex was set to allow extension and flexion at three speeds (90°/sec, 180°/sec, and 360°/sec) with four repetitions each. Between each speed there was a rest period of 60 seconds. SPSS was used to analyze potential differences between the variables. The alpha levels was set at p < 0.05. Subject #40009 Table 1 Figure 1 DemographicsMeanSDMinMax Age (yrs)23.711.972128 Height (in)70.424.426780 Weight (lbs)175.9015.12139.92200.86 Body Fat (%)19.333.3914.0124.75 Table 2 Agonist/AntagonistForwardDefensivep-Value 90°/sec63.57±26.761.64±8.00.88 180°/sec78.54±25.368.74±11.10.44 360°/sec82.91±25.791.1±10.40.52 Table 3 Peak Torque(F) Mean ± SD(D) Mean ± SDp-Value 90°/sec (ext)112.23±36.7599.18±31.730.54 180°/sec (ext)84.83±28.1678.94±19.850.69 360°/sec (ext)70.57±28.6454.6±11.690.27 90°/sec (flx)69.68±26.8959.54±16.460.47 180°/sec (flx)60.98±10.7252.82±8.590.19 360°/sec (flx)54.57±12.5149.14±6.830.40