Abstract
The 180º cutting maneuver (also known as the 505 drill) is commonly seen in field and court sports, and it consists of a 15 m run up to a turning point, followed by a timed stop and 180º change of direction for 5 m. The purpose of this study was to determine the most effective joint movements, limb velocities and body positions to perform the 180º cutting maneuver. Additionally, the study compared the kinematics of the 505 drill performed indoors while wearing running shoes and outdoors while wearing cleats. For this study, twelve athletes executed the 505 drill indoors while wearing running shoes, and twelve executed the 505 drill outdoors while wearing cleats. Fifty nine independent variables were measured for each athlete and compared to the athlete’s time to complete the test. Mean test time was 2.27 seconds for the indoor group and a significantly lower 2.47 s for the outdoor group. Correlation analysis and forward stepwise multiple regression analysis was performed on both groups to determine which variables were significantly related to test time. Trunk forward lean at push off of the jab leg was most highly correlated to test time for the indoor athletes (r= -0.887), however, flexion at maximum flexion of the jab knee was most highly correlated to test time for the outdoor group (r= -0.748). Outdoor athletes could benefit from assuming a lower and more flexed body position similar to the indoor athletes and attain a greater degree of trunk lean at jab leg touchdown.
Highlights
The ability to perform the perfect cut at exactly the right time in sports often leads to substantial rewards
Following the measurement of variables, statistical analysis was performed in order to determine which variables differed between the two groups, which variables were strongly correlated to the athlete's test time for the two groups separately, and which variables were determined to be the best predictors of test time for each of the two groups separately
The fact that the indoor athletes were able to keep their centre of gravity further from the tumaround point, could account for this non significance
Summary
The ability to perform the perfect cut at exactly the right time in sports often leads to substantial rewards. It can allow a football player to evade his defender in order to catch the winning touchdown of the Super Bowl. The 180" cutting maneuver is different from all other changes in direction as it involves a complete deceleration of the athlete's velocity to zero meters per second before tuming and accelerating again. This study analyzed the last step before the jab step, touchdown of the jab step, maximum knee flexion of the jab step, push off of the jab step and the first step in the new direction Additional variables such as the linear velocity of the athlete at different points during the test as well as angular velocities of the athlete's hip and knee extension were analyzed through the use of Dartfish 4.5.2 video analysis software. Following the measurement of variables, statistical analysis was performed in order to determine which variables differed between the two groups, which variables were strongly correlated to the athlete's test time for the two groups separately, and which variables were determined to be the best predictors of test time for each of the two groups separately
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