Kettler TRACK-9 Manual Del Usuario página 22

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Biomechanics
On the treadmill the most different forms of training can be exe-
cuted, from walking to running to sprinting. The execution of mo-
vement of walking, running and sprinting is divided into four
phases:
The motion sequences while running cannot be standardised and
therefore the choice of the economic running style is very indivi-
dual and significantly depends on the running speed and the
physical constitution. One distinguishes between different types
of touchdown of the heel.
• Touchdown of the front foot: Initial floor contact starts with the
front foot. The knee is slightly bended when the foot hits the
ground and therefore a major part of the arising forces is cus-
hioned via the muscular system.
• Touchdown of the rear foot: Initial floor contact starts with the
heel. The knee is almost stretched when the heel hits the
ground and the movement is cushioned by the passive loco-
motor system and the shoes.
• Touchdown of the midfoot: Initial contact with the ground via
the midfoot Combination from touchdown of front and rear
foot.
It is a fact that an economisation of the running technique pre-
vents early fatigue and injuries and that the biomechanical requi-
rements during running and the occurring forces depend on the
following points:
• Running speed
• Floor conditions / route profile
• Physical constitution
• Running technique
• Shoes
• Statics of the lower extremities
Here the knee is maximally lif-
ted and the leg is mainly
swung forwards. When tou-
ching the ground with the foot
the lower extremities will be
cushioned within a period of
10 - 20ms by a passive dece-
leration movement.
Touching the ground with the
foot causes forces which are 2
to 3 times higher than the
body weight. Therefore you
should make sure to wear the
suitable shoes in order to ade-
quately absorb the arising for-
ces and guarantee a healthy
pronation of the foot.
In the final phase the foot is
straight and pushed off from
the ground via the first toe