Static hip flexion and abduction as well as leg vector spreading angles (VSA) at different nodes of the kick were selected to determine adaptions of active and passive flexibility. Tests were recorded by a ViconĀ® motion capturing system. Static hip flexion and abduction as well as kinematics of double side kicks were analysed on 15 participants before and after training (or rest for controls) to assess general flexibility and sport-specific movement range. The device is designed to trigger residual muscle tone decreases of the hip-joint muscles by providing (nearly) isokinetic resistance during a full range of motion strength training in adduction/abduction and flexion/extension direction. The study objective is to test general- and sport-specific adaption during a single training on the Flexibility Trainer. A model for hip-joint moment calculation based on force sensor and motion capturing data is proposed. It is hypothesised that the leg-spread movement activates the reciprocal-inhibition reflex and increases antagonistic strength, whereas the leg-closing movement activates the autogenic-inhibition reflex and leads to serial hypertrophy. Its main components are a rail system with 2 slides and foot mounts (tiltable and turnable), a hydraulic braking system for force independent constant velocity slide (nearly isokinetic), a force sensor and a holding device. The FT aims to utilise the athletes body weight while performing controlled leg spread. The device provisionally called Flexibility Trainer (FT) is equipped with sensors to measure and estimate the athletes' hip joint moments during training. Therefore, the aim of the study was to develop a model prototype of a device utilising flexibility-enhancement reflexes and appropriate strength training methods for hip joint range-of-motion (ROM) increase. Latest research suggests that flexibility and antagonistic strength are strongly related and require agonistic strength training. Martial Arts, dancing, and gymnastics are among the sports that directly depend on outstanding hip-joint flexibility and strength to successfully perform high level techniques.
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March 2023
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