Design and Development of a Personal Trainer System

1
Design and Development of a Personal Trainer
System

• Progress Presentation
• by
• Emer Bussmann

2
Introduction

• Exercise is the key to a healthy life
• importance of personal limits
• regulate and progress
• ability to measure, store and track the progress

3
The Design of the Proposed System

• maximum benefit out of training sessions
• effective motion sensors for physical activity
  assessment
• Bluetooth-based ECG circuitry
• low cost portable acquisition system
• software for monitoring and processing human body
  movement

4
SparkFun Board Bluetooth ECG sensors

Worn by User Bluetooth
LabVIEW8
PDA equipped with LabVIEW for data processing
File Transfer
PC-based Database
Fig 3 Block Diagram of system
5
Accelerometer System

• micro-electromechanical device
• measure acceleration forces (static, dynamic)
• change in capacitance
• antero-posterior, medio-lateral, or vertical

6
Solution

• WiTilt v2.5 Board from SparkFun Electronics
• Freescale MMA7260Q triple-axis accelerometer and
  a class I Bluetooth link
• Internal antennae for range

7
Data acquisition Unit

• Acquire and process the signals
• LabVIEW software to filter, amplify, rectify and
  integrate to create clean noiseless output data
• Send data to a PC-based database

8
Solution

• Packard iPAQ hw6910/hw6915
• Bluetooth type 1.2 and WiFi 802.11b
• Expansion mini SD card

9
Mathematical Basis of the Parameters of Interest

• Stride Time
• Distance
• Speed
• Energy expenditure

10
Stride Time, Distance and hence Speed

• vertical bounce (of the hip) in an individuals
  step is directly related to the persons stride
  length

11
Step finding algorithm (zero crossing algorithm)

• An 8 point moving average is used to search for a
  maximum peak followed by a minimum

12
Determine the distance walked

• d distance walked
• k constant multiplier
• max maximum acceleration value measured in this
  step
• min minimum acceleration value measured in this
  step
• avg average acceleration value for this step
• accel represents all measured acceleration
  values for the step
• completed for each step

13
Energy expenditure

• 1) A low pass filter removes the shock noise of
  moving artefacts,
• 2) Activity x(t) at each axis is determined by
  integrating the accelerometer signal
• where tau is set to 1s
• Total activity level is the Vector Magnitude
  (VM) of the signals
• VM x(t) y(t) z(t)
• 3) Every 10s the activity signals were summed

14
Vertical acceleration the predominant source of
signal power

• 1) Step frequency is estimated using a count of
  samples between successive zero crossings in the
  vertical acceleration
• 2) Another filter is used to remove signals
  above twice the step frequency
• 3) VM is averaged at each speed and
• 4) Gait cycle is normalised to compare signals
  from different step frequencies

15
ECG System

• maintain a heart rate level that will optimise
  the effect of physical exercise
• use the design of a project from Sweden that is
  available in the public domain
• battery powered
• measuring up to 3 analogue channels of ECG on an
  exercising subject

16
Body Attached Sensors
Amp
Analogue Signal UART Serial
Microcontroller
Connection Digital Signal
Bluetooth Module
Wireless Fig 7 ECG System
PDA With LabView
17
Schematic of ECG system
18
Progress to date

• All of the equipment has been ordered
• Extensive research
• Labview8 has been installed on laptop and
  currently testing signals from accelerometer

19
Future work

• January
• Construct an ECG monitor
• February
• Write software to process the accelerometer data
  
• March
• Create a working system

20
Acknowledgements

• I would like to thank my supervisor Professor
  Gearóid Ó Laighin and PhD researcher Anthony
  Dalton for all their help and support.

21
References

• http//www.ncbi.nlm.nih.gov/sites/entrez?cmdretri
  evedbpubmeddoptabstractlist_uids9216127
  TA accelerometer
• http//www.analog.com/UploadedFiles/Application_No
  tes/47076299220991AN_900.pdf pedometers using
  accelerometers
• http//ieeexplore.ieee.org/Xplore/login.jsp?url/i
  el5/10755/33900/01615295.pdf energy expenditure
  and accelerometers
• http//ieeexplore.ieee.org/Xplore/login.jsp?url/i
  el5/10646/33608/01597820.pdf?arnumber1597820
  energy expenditure and accelerometers
• http//www.brightcity.co.uk/hp_ipaq_6915_pda.htm
  PDA
• http//www.mobiletechreview.com/HP-iPAQ-hw6915.ht
  m PDA
• http//digital.ni.com/public.nsf/allkb/15987C8CB75
  2EAD786256DC20070B433?OpenDocument NI for
  LabVIEW
• http//zone.ni.com/devzone/cda/tut/p/id/3260.
  NI for LabVIEW
• http//www.sparkfun.com/commerce/product_info.php?
  products_id254 Sparkfunhttp//forum.sparkfun.
  com/search.php?moderesults Sparkfun