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AMTI Biomechanical Fore Platform

AMTI's six-axis biomechanics products represent the culmination of more than 30 years of research and refinement. Their excellent performance and long-term durability have made them the worldwide standard in gait and biomechanics laboratories. We provide researchers with the highest quality force measurement and analysis tools available. All of their force plates, force sensors, and instrumented equipment have been specifically engineered for biomechanical applications and carefully manufactured under the ISO 13485 medical-grade quality system.

AMTI biomechanics force platforms may be used either free-standing or mounted in place with appropriate mounting hardware.  When deciding what your mounting requirements are the following things should be considered

Free standing platforms may work well for activities with relatively low frequency dynamic content, low impulse loading and low side loads such as balance and gait activities.  Yet even for these activities care must be used to place the platform on a flat surface so that it does not rock or shake when loads are applied.  If the platform rocks against a hard flooring surface, noise artifacts may be introduced into the data.  Carpeted floors will generally work reasonably well as the compliance of the carpet distributes the load evenly between the platform and the floor.  On hard surface floors, such as asphalt tile flooring, it is best to shim the platform under the mounting pads until no rocking is evident.  This can be done using paper or scotch tape shims. 

AMTI biomechanics force platforms are designed to measure forces and moments applied to their top surface and as a direct result these instruments are sensitive to accelerations as well.  Building vibration and ground vibration can be transmitted to the platform and can result in unwanted signal noise.  Heavy concrete construction or ground laid concrete slabs provide the best flooring situations.

For the highest accuracy measurements the force platform should be mounted in a manner that minimises vibration of the entire force platform system including the base structure. This is best accomplished by bolting the force platform to a flat plate that is bonded to a solid structural foundation.  AMTI mounting plates are available for each force platform model.

The diagram below shows the three force and the three moment components that are measured as a subject is in contact with the platform.

Three force and Three moment components

Fx, Fy, and Fz are the force components and act along the axes of an orthogonal x, y, z-coordinate system. In the diagram, the arrows point in the direction of positive force along each of the axes, following the right-hand rule. Fx and Fy are the horizontal or shear force components, and Fz is the vertical force component.

Mx, My and Mz are the three moment components. Moments are rotations around the corresponding x, y and z axes. Positive moments are determined according to the right hand rule. When looking down an axis (in its positive direction) positive moments have a
clockwise rotation.

Force plates can be used individually or arranged in a walkway format to collect multiple footfalls. A complete standard system typically consists of an Optima HPS-, BP- or OR-series force plate, an amplifier, a computer or data acquisition system, mounting hardware, and interconnecting cables. A complete portable system typically consists of a portable force plate, a computer or data acquisition system, and interconnecting cables.
Force Plates can be used for: Gait, Sport and Balance

AMTI Force-Sensing Tandem Treadmill

AMTI Force-Sensing Tandem Treadmill

AMTI Force-Sensing Tandem Treadmill

With an AMTI tandem treadmill, subjects can walk naturally with no need to maintain their positions medial-laterally or straddle the belt split that runs down the center of the treadmill. With only a 1 mm clearance between the two belts, they function as one continuous belt.

A six-axis AMTI force plate is located under each belt to record the ground reaction forces (Fx, Fy, Fz) and moments (Mx, My, Mz) generated by the subject. High-performance motor controllers and included software provide users with an intuitive interface for control of treadmill inclination, belt travel direction, and belt speed up to 20 kph. The extensive capabilities of the Tandem Treadmill make it an ideal method of studying both walking and running under level, uphill and downhill conditions.