PKMAS and Zeno Walkway
System
ProtoKinetics LLC
Michael Rowling
Kristen Larsen
www.protokinetics.com
Zeno Hardware
• Technical Specifications
16 levels of dynamic pressure
0.4’’ square sensors on 0.5’’ centers over sensing array
Dual control sensing elements avert false firing
•Three Layer Walkway (0.5’’ height)
Base Layer:
-Flexible linoleum with sloped rubber edging facilitates
smooth transitions onto walkway
Middle Layer:
-Protects sensing technology and circuitry
-Reduces curling of the edges
Top Cover:
-Carpet or flexible linoleum with a variety of patterns
-Velcro edge lining secures layers
•Customization: match your lab and research needs
Top cover Pattern
Size
8’
12’
2’
4’
x
x
14’
16’
20’
26’
x
x
x
x
x
Zeno Walkway Setup
•The 2x16 Zeno
mat ships in two
boxes.
•To setup, first roll
out the base layer.
Then, roll the
sensing carpet out
with its circuitry
fitting into the
base. Complete
the walkway by
securing the top
cover in place with
its Velcro edges.
• To record a walk,
use the Zeno box
to connect the
walkway to the
USB port of the
computer with
PKMAS software
installed.
Powered by PKMAS Software
•Data collection, processing, and analysis software for:
Zeno Walkway
GAITRite platinum series
•Encryption key for data security
•Multiple pass trials
•Minimum volume ellipse bounded footprints
•114 primary and computed gait parameters
 COP, COMe, step/stride length, foot area, Coefficient of Variation, Left/Right Ratio,
cadence, Toe In/Out angle, Path Efficiency
•Export gait measurements
•Develop Custom Protocols
Walking (with or without dual tasking), TUG, Figure 8’s, FSST, 360° turns, Fukuda Step
Test, side stepping, unilateral and bilateral stability
Syncing
•Push-button switch
User marks change of event during
recording for quick referencing
during analysis
Binary square pulse
•Zeno Interactive Module
Use with PKMAS for lights and
tones
Built-in random delay features
Ideal for gait initiation
•Wireless XBEE input
 Inclinometer Devices
Cup & Tray Dual Tasking
Track upper body movement( X, Y)
•Internal Metronome
40 BPM-208 BPM
•Sync Output (3.5mm Stereo Jack)
TTL Pulse
•Logitech Video Camera
1-2 cameras
Synchronized video and footfalls
PKMAS Angles
•Projection Angle of Stride
Vector from heel of one foot to consecutive heel of the same foot (degrees)
Useful in non-linear walking to describe movement direction at any point in time
 PKMAS step length considers direction of progression for optimal measurement accuracy
•Minimum Volume Bounding Ellipse
Computes ellipse with the smallest area that wholly encloses all sensors of a footfall
Ellipse’s major axis used to determine foot placement angle
Reliable over gait patterns with anomalies
Ellipse theory considers the shape of entire footfall
incomplete and asymmetric footfalls will display less error than competitive techniques
Center of Mass Estimated
• Exclusive COMe algorithm based on velocity and direction of pressure sensor activation
• Algorithm tested in varying conditions against state of the art motion capture systems at two
major US research institutions
COM data (red) plotted against PKMAS COMe calculation (green).
Gait Measurements
•Display Gait Measurements table in
PKMAS for statistical and step by step
quantitative values
•Easily navigate from any footfall
measure to the first or last contact
time on walkway
•Measures include:
Toe/Heel Location
Foot length, width, area
Step/stride time, length, width
Stance, swing, gait cycle
Stance, swing, single/double
support percent
Velocity, cadence
Foot angle, direction of
progression
Left to Right Ratios
Exporting to Excel
• Export directly from Gait Measurement table to effortlessly create plots
•Graphing the
Left/Right Ratio
provides a
meaningful
depiction of
asymmetrical
variables
The ProtoKinetics Advantage
•PKMAS Platform
Advanced and Accurate Measurements
Verified, Validated and Certified
Capable of processing many walk files that competitors cannot
User-friendly, Precise Documentation
Continuous software growth
Excellent Technical support
•Testing Protocols
Incorporate new measurements
Certifications
Multiple passes and turning trials
ISO 13485:2003
Zeno Interactive Module
CE Marked
•Zeno Walkway
16 levels of pressure
Protected sensing technology
Available in 2’ and 4’ widths
Verified, Validated and Certified