Biomechanical Analysis Of Athletes' Ankle Movement In Compound Movement Mode

Ankle is the largest garrison joint flexion, the three lower limb joints as the most distal portion of the body balance its stability plays an important role. Tennis belongs to the dominant class skills in Net type event group athletes in a non-stop run, move, start and stop and other complex motion with the lower limbs, tennis athletes have an important impact.The research project combining features tennis select a representative compound action: stop running and start running forward(action A), then stop running laterally start running(Action B) and stop running and then turned 180 ° start running(action C), carried out a biomechanical study ankle motion characteristics. Provides a comprehensive understanding of the relevant muscle Tennis Players ankle participatory mechanisms theoretical basis, in order to reduce the incidence of Ankle Injury Prevention and avoid injury propose methods to provide a reference for the ankle joint in daily training and competitions ways and means.Experiments of this study in Tianjin Institute of Physical biomechanics laboratory, using Vicon motion capture system, Kistler force platform 9281 B and US Noraxon company’s 8-channel telemetry surface EMG(model SEMG10-1000-8), three synchronizing means test. Vicon synchronization triggered by the data acquisition system to collect biomechanical data tennis players ankle. Tennis Players ankle biomechanical features frontal, sagittal, horizontal torque, EMG, etc. in the complex movement patterns. The following conclusions:1. Action A, B, and action action three movements are experienced C stop time, buffer time period and kicking. Dorsiflexion torque generated during an emergency stop, kicking generated during plantar flexion torque. Maximum plantar flexion torque three actions is 2.5-5.5 times the maximum dorsiflexion torque value.Torque maximum external rotation direction of the horizontal movement 2. B is 2.5-7.4 times that of other actions, the maximum torque of dorsiflexion action C sagittal plane is 1.8-2.7 times the other two actions.3. Action A, B and muscle action are mainly involved in the operation C gastrocnemius, tibialis anterior muscle and the peroneus longus. A stop action is the tibialis anterior muscle during participation in sports, buffer period and kicking during the peroneus longus and gastrocnemius muscles involved in the movement; stop stage action B is the supporting leg tibialis anterior and peroneus longus participate in sports, buffer period gastrocnemius When the action C in gastrocnemius and peroneus longus involved throughout the campaign; peroneus longus and participate in sports, to leave the leg that is swinging leg, stop stage gastrocnemius and tibialis anterior muscle to participate in sports, the buffer stage is peroneus longus muscle gastrocnemius participate in sports phase, tibialis anterior muscle primarily involved in the stop period.4. Action A muscle activation order is tibialis anterior, gastrocnemius, peroneus longus; Action B activation order is the gastrocnemius, tibialis anterior muscle, peroneus longus; Action C activation order gastrocnemius, peroneus longus, tibialis anterior muscle.5. Action C gastrocnemius and peroneus longus duration is more than twice the action A gastrocnemius and gastrocnemius duration; tibialis anterior muscle in three actions in duration or less.