A biomechanical analysis of the long-jump technique of elite female amputee athletes

• Published in: Medicine and science in sports and exercise Vol. 38; no. 10; p. 1829
• Main Authors: Nolan, Lee, Patritti, Benjamin L, Simpson, Kathy J
• Format: Journal Article
• Language: English
• Published: United States 01.10.2006
• Subjects: Amputees; Artificial Limbs; Biomechanical Phenomena; Female; Gait; Humans; Knee Joint - physiology; Postural Balance; Range of Motion, Articular; Sports - physiology; Tibia - surgery; Torque; Track and Field - physiology
• ISSN: 0195-9131
• DOI: 10.1249/01.mss.0000230211.60957.2e

The purpose of this study was to investigate whether female lower-limb amputees conform to the established long-jump model and to compare the kinematics of the approach and take-off phases for elite female transfemoral and transtibial amputee long jumpers. Eight female transfemoral and nine female transtibial amputee athletes were videotaped (sagittal plane movements at 50 Hz) from third-to-last step to take-off during the 2004 Paralympic Games long-jump finals. After digitizing and reconstruction of 2D coordinates, key variables were calculated at each stride and during contact with the take-off board. Additionally, approach speed during the run-up of each jump was recorded (100 Hz) using a laser Doppler device (LDM 300 C Sport, Jenoptik Laser, Jena, Germany). The transfemoral amputees had a consistently higher center of mass height on the last three steps before take-off than the transtibial amputees. However, at touch-down onto the take-off board, they lowered their center of mass excessively so that from touch-down to take-off, they were actually lower than the transtibial amputees. This resulted in a greater negative vertical velocity at touch-down and may have inversely affected their jump performance. Female transtibial athletes conformed to the long-jump model, although adaptations to this technique were displayed. Female transfemoral athletes, however, exhibited no relationship between take-off speed and distance jumped, which may be attributable to their excessive lowering of their center-of-mass height at touch-down onto the take-off board. It is recommended that coaches and athletes proceed with caution when trying to replicate techniques used by able-bodied athletes because adaptations to the constraints of a prosthesis should be considered.