The Running Cycle :: Sport Run Running Athletics

There are two main phases to the trial cycle Support and precedent Recovery Support Phase This is the phase when the runner is touching the ground, and makes up about 30%-40% of the running cycle. Foot-strike The alkali touches the ground slightly ahead of the center of mass. When the foot contact occurs, some(prenominal) actions take place the stifle flexes, the tibia internally rotates, the ankle plantar flexes, and the subtalar joint pronates (Miliron & Cavanagh, 1990). It is necessary to have a certain amount of pronation to interpenetrate the energy of the foot-strike. The foot during the foot-strike should be straight and in line with the style of linear motion. If the feet are turned outward it reduces the distance covered, and puts more underscore on the knees and lower extremities (Williams, 1990).Mid-support The foot transforms from a mobile structure into a rigid lever that supports several times the body weight of the runner. The limit of the bones and the te nsion on the ligaments, allows for the foot to remain rigid. The supination of the subtalor joint forms a rigid lever for forward propulsion. This occurs through a series of events including the knee joint extending, the lower extremity rotates externally, the calcaneus inverts, the midtarsal joint locks, and the foot becomes a rigid lever.What is Supination? This is the opposite motion of pronation. This occurs when the ankle appears to be tipped to the outside so the weight is on the outside border of the foot. Supination allows the foot to be a more stable, rigid structure for pushing off of. The foot naturally supinates during the toe-off stage (when the heel first lifts off the ground until the end of the step) to render more leverage and to help roll off the toes. Take-Off The the mid-support period ends with an uprising heel, and is called the take-off period.100 World Record Holder Florence Griffith Joyner in take-off periodForward Recovery Phase This is the phase when t he runner is airborne and spends most of the time.