The document discusses using a GENEActiv accelerometer to monitor trail runners. It describes how the accelerometer was worn on the non-dominant wrist of participants for 48 hours at a frequency of 85.70 Hz. The accelerometer was used to measure four intensities of physical activity - sedentary, light, moderate, and vigorous - based on metabolic equivalents (METs). The results from the accelerometer were downloaded to a spreadsheet file and the percentage of time spent in each intensity range was calculated and plotted for 8 hour intervals throughout the day. Conclusions drew relationships between the plot shape and physical activity levels, estimated energy expenditure, and more.

1. GENEActiv accelerometers
Objective: To use a triaxial accelerometer to monitor
trail runners
eTwinning Project “Jump for Knowledge”
INS La Sénia (Spain) - II LO im Jana Śniadeckiego w Kielcach, Kielce (Poland)
Servei Esports
Universitat Jaume I Castelló (Spain)

2. How do smartphones rotate the screen?
https://developer.tizen.org/development/guides/native-application/location-and-sensors/device-sensors
[08/04/2018]
They have got an
accelerometer
inside

3. How do accelerometers work?
MICROCHIPS
We're talking about amazingly
tiny distances here of a few
millionths of a meter (µm,
microns)
http://www.explainthatstuff.com/accelerometers.html [08/04/2018]

4. How do accelerometers work?
https://youtu.be/KZVgKu6v808 How a Smartphone Knows Up from Down

5. Accelerometer Apps on Smartphones
Physics Apps use it to measure gravity ACCELEROMETER ANALYZER
WATCH IT LIVE!!!

6. If Gravity is subtracted, then we measure the Signal Magnitude Vector (user
driven acceleration)
Accelerometer Apps on Smartphones

7. GENEActiv accelerometer
(Activinsights Ltd., Kimbolton,
Cambridgeshire, United Kingdom)
GENEA accelerometers and pupils

8. Method
• The acelerometer was worn 48 hours (Monday 9th, Tuesday 9th)
• Frecuency: 85.70 Hz
• Time: average each minute (SVMgs/min)
• Non dominant wrist, as a watch
• Four intensities effort (Esliger et al. 2011):
Sedentary (i.e. resting, <1.5Mets)
Light (i.e. walking, 1.5Mets-4Mets)
Moderate (i.e. jogging, 4Mets-7Mets)
Vigorous (i.e. running, >7Mets)
WHAT IS A MET? Metabolic Equivalent of Task

9. Method
• Four intensities effort
(Esliger et al. 2011):
Sedentary (i.e. resting, <1.5Mets)
Light (i.e. walking, 1.5Mets-4Mets)
Moderate (i.e. jogging, 4Mets-7Mets)
Vigorous (i.e. running, >7Mets)
WHAT IS A MET? Metabolic Equivalent of Task

10. Method
• Download the accelerometer results on an spreadsheet file (Excel, Open Office)

11. Results
• Workout the percentage of each range dividing the day in 8 hours intervals and
plot them

12. Conclusions
• Draw out the conclusions.
- Relate the plot’s shape with the physical activity done during each period
- Estimate the energy spent in each interval
- ….