core technology behind the PAL family of products has been developed
and refined over a number of years using both patient groups and unimpaired
subjects. One of the key drivers for our clinical colleagues was
that, although they could easily measure in the laboratory the
walking skills and exercise tolerance of their patients, this
told them little about what activities they actually did when
they were at home or work. Self-report diaries have been shown
to be unreliable so simple and unobtrusive technologies were developed
to accurately describe posture allocation and free-living activity.
expertise in microsensors (MEMS) and miniaturised digital recording
technology combined with our proprietary technology platform has
resulted in products for medical and healthcare research
Long-term Ambulatory Monitor -
lightweight (15g) and only 7mm thick.
only 15 grams
- 53 x 35 x 7 mm
day recording period
proprietary algorithms, (Intelligent Activity Classification),
it classifies an individual's free-living activity into periods
spent sitting, standing and walking. This information can be used
to estimate daily energy expenditure and changes in the free-living
activity profile can be tracked against medication or treatment
activPAL is worn discretely on the thigh (see illustration).
PALstickies are the recommended attachment
method for waking day recordings. The
`stickies employ a patented dual layer hydrogel to
provide optimum skin adhesion on one surface and device adhesion
on the other. The dual layer gel allows the skin contact side to
conform to the skin surface and provides adhesion without requiring
the skin surface to be shaved or abraded. The
multi-stick property of the `stickies allows them to be removed and repositioned
on the skin on multiple occasions.
For continous wear the activPAL
be waterproofed by wrapping with a medical
grade adhesive covering (e.g. 3M Tegaderm or S&N Opsite flexifix) and then attached to the thigh using another sheet of dressing. This attachment, subject to daily review, can provide 3-7 days continuous wear, allowing the wearer to shower without removing the activPAL.
is capable of recording for in excess of seven days continuously.
The stored activity profile is retrieved and processed using a PC.
Some results from previous studies are given in the examples
section of this website.
sample screen shot is displayed below:
example profile is from a 65 year old woman:
4 and 5PM she takes a walk and then begins to prepare the evening
meal is served shortly after 6PM and she serves dessert around
7PM she clears the meal away and retires to the sitting room.
waking day recording for both her and her husband can be found on
the examples page.
activPAL has been designed for healthcare researchers and other professional
users who have a requirement to measure free-living activity.
specification sheet for the activPAL, activPAL3, activPAL3 VT can be downloaded from here.
further details of the activPAL family of products please contact us at firstname.lastname@example.org.
Long-term Ambulatory Monitor has been developed for lower-limb prosthetic
monitoring applications providing detailed information on prosthetic
use over extended periods (12+ months). It is avaliable exclusively
from Chas A Blatchford & Sons Ltd, www.blatchford.co.uk.
LAM example (graphical output):