Abstract Summary
Butterfly pull-up is a popular Crossfit exercise that requires unique biomechanical strategies to maximize performance. However, little is known regarding changes in butterfly pull-up biomechanics when performed until failure. In this study, the elbow, shank and thigh kinematics during butterfly pull-ups were recorded from Crossfit athletes using an inertial motion capture system. Kinematic changes were assessed between the first and last five repetitions during a single bout performed until failure. The results showed increased shank and thigh vertical velocity, as well as increased elbow flexion angular velocity, towards the end of the exhausting bout. In conclusion, Crossfit athletes change movement strategies towards increasing the vertical velocity of lower limb segments and increasing upper limb contribution to raise the center-of-mass when close to failure.
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