This coordinated motion occurs in much less time that it takes to describe. It is, nevertheless, a complex process in which many things can go wrong. If a structural problem is present, the foot can collapse under the body's weight. Runners in particular exert much greater forces on their feet than those generated by simple walking. This can lead to more severe injuries, such as sprained ankles, shin splints and even fractures.

Running Cycle

Runners are categorized as ‘Heel Strikers’, or ‘ Forefoot Strikers’, depending up which part of the foot first contact the ground.

Heel strikes   
Have two impact peaks which occur in the weight-bearing phase. At heel contact, the Heel striker has a straight knee, with the impact being reduced by subtalar joint pronation followed rapidly by knee flexion.

Forefoot Strikers   
Make the initial contact with the forefoot. Impact forces have been shown to decrease with forefoot runners, as the Achilles tendon and calf muscles act as shock absorbing system. The hips and knees are also flexed at contact, utilizing the quadriceps for shock absorption. This reduces the transference of shock waves from the foot to skull. However, this muscular effort requires an increase in oxygen uptake by as much as 50% and increase the tension taken by the Achilles tendon.

TOP First  1  2  3  Last