Abstract

Korean teeterboard is one of the most physically and technically demanding circus disciplines. Two performers take turns jumping vertically and land with high impact. The aims of this study were to (1) compare the stiffness across three different teeterboards, and (2) compare Peak Landing Force (PLF) and Maximal Loading Rate (MLR) of four acrobats performing jumps from three teeterboards using four landing techniques (normal, smooth, straight legs, and empty board). Pressure sensors were used to determine recorded forces under the feet, while Boosted Regression Trees (BRT) was used to analyze factors contributing to PLF and MLR. Standard static loading protocol was used to estimate teeterboard stiffness. PLF and MLR increased with jump height. PLF and MLR were reached when landing on the teeterboard with the highest stiffness. The “normal” and “straight legs” landing techniques were associated with higher PLF and MLR. The BRT model was able to associate both PLF and MLR with jump height, participant, teeterboard, and landing technique factors. PLF reached 13.5 times the body weight when landing on the stiffer teeterboard using the straight legs technique. Trainers should be aware of the injury risk to teeterboard acrobats during landing.

Highlights

  • Korean teeterboard is part of the circus disciplines involving a piece of equipment and is an extremely physically and technically demanding circus act (Figure 1)

  • The results showed that Peak Landing Force (PLF) and Maximal Loading Rate (MLR) increased with jump height

  • Maximum PLF and MLR were reached when landing on the Machine de Cirque (MDC) teeterboard with the highest stiffness

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Summary

Introduction

Korean teeterboard is part of the circus disciplines involving a piece of equipment and is an extremely physically and technically demanding circus act (Figure 1). Two performers take turns jumping vertically, performing complex acrobatic figures, and landing back on the apparatus. The sequence of movements requires the first acrobat to land on one extremity of the apparatus, causing the teeterboard to rotate at the pivot point. The other acrobat is propelled vertically as the teeterboard rotates. After take-off, the performer has to reach a position high enough to safely execute complex acrobatic figures and land back with precision on the teeterboard. A body translation at take-off can lead to a non-vertical trajectory, inaccurate landing, and potential injuries.[1]

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