A computer based diagnostic system for the assessment of strength capabilities consisting of strain gauge force plate (one-, or two-dimensional), electronics, 12-bit AD convertor, interface and software.

 

 Software consists of data aquisition and storage, calibration, and extensive analytic reporting (time zooming with integral a mean calculation from defined time segments for parameter assigned to Y1 and Y2 axes).

 

 Software also includes a special analytical module for calculation of acceleration, velocity, displacement and power from force-time curve (see below) during single squat or jump.

 

 

Calculation of additional biomechanical parameters from force-time curve: basic principle.

Verical force (F) applied to the plate consists of weight (product of body mass m and gravitational constant g) and inertia component (product of body mass m and vertical acceleration a)

 

 F =  (m  x  g) + (m  x  a)

 

 F =  m  x  (g + a)

 

          F

a  =  –––  –  g

         m

v =  integral of a   (a . t)

 

h =  integral of v   (v . t)

 

P =  F x  v

 

 

 

   

 

Maximal power: 3455 W and 43,2 W/kg,  resp.

Height of the jump:  36.7 cm

 

 

Testing Protocol

–       Squat jump

–       Counter movement jump

–       Drop jump

–       Jumps (squat, counter mobement and drop) with additional weight

 

 

Parameters

– Mean and maximal power during take off (W)

– Height of the jump (m/s)

 

 

Applications

–       assessment of strength capabilities of lower extremities

–       evaluation the effect of training

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