Robert Pierce, Dave Heller, and Nicole Moodie; Rockhurst University; email: piercer@hawks.rockhurst.edu

A previous study conducted in our lab revealed a significant difference in vertical jump measures obtained by using a standard jump station and markerless motion capture. PURPOSE: The purpose of this study was to determine if kinematic and kinetic variables contributed to differences in vertical jump height. METHODS: Seventeen recreationally active college subjects (9 male, 9 female) volunteered to participate in this study. Subjects reported to a motion capture facility for one testing session. Following a five minute jog warm-up, subjects completed three randomized trials of three different jumps. One jump required the subject to focus on a target they had to reach for on the jump station, another required the subject to look forward as they jumped to the target on jump station, while one jump did not use the jump station. One minute of rest was taken between jumps; five minutes rest was taken between jumping trials. All jumps were initiated from a standard two-legged stance with a countermovement. Each jump was filmed using a 14-camera marker-less motion capture system. RESULTS: Repeated measures analysis of variance (ANOVA) tests revealed significant differences in right hip and both right and left ankle joint torque measures across trials, as well as significant differences in the minimum hip, knee, and ankle joints across trials. These differences were observed specifically between the jumps performed with the markerless motion capture system as subject jumped freely and not for a specific target, and when they jumped at the jump station.

Joint Torque

Right Hip

F(2,32)=3.311, p<0.05

Right Ankle

F(2,32)=8.569, p<0.05

Left Ankle

F(2,32)=3.881, p<0.05

Joint Angle

Right Hip

F(2,32)=73.90, p<0.05

Left Hip

F(2,32)=20.12, p<0.05

Right Knee

F(2,32)=65.61, p<0.05

Left Knee

F(2,32)=73.16, p<0.05

Right Ankle

F(2,32)=6757, p<0.05

Left Ankle

F(2,32)=2590, p<0.05

CONCLUSIONS: Understanding lower body kinematics that may influence kinetic variables such as joint torque, and how these variables could change determining on the type of jump testing used could provide critical information for proper vertical jump assessment.



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