Are uniaxial accelerometric signals currently being used in any ongoing physical-activity research? Or does it all use triaxial signals?
Semi-related: does any wearable device used to assess activity, capture only the vertical axis? I know the iPhone accelerometer is triaxial, but how about other devices like the Apple Watch or the Spire stone?
Hi,
Kindly elaborate the question. Based on the above posted query, though there are single axis accelerometer sensors available, 3 axis chips have greater advantage over single axis in terms of functionality.
For the second part, as far as i know, most of the smart phones come equipped with 3 axis accelerometer chips.
Regards
Hello Maia,
About your first question:
- I think that it depends of your research topic and on the physical activity that you want to measure. In any case, the accuracy of uniaxial is lower than triaxial accelerometers.
The second question:
- Reliability and Validity of these activity trackers depend on walking speed and yes, they have triaxial accelerometers.
Have a look at this article:
Chowdhury, E. A., Western, M. J., Nightingale, T. E., Peacock, O. J., & Thompson, D. (2017). Assessment of laboratory and daily energy expenditure estimates from consumer multi-sensor physical activity monitors. PLoS ONE, 12(2), e0171720. http://doi.org/10.1371/journal.pone.0171720
Best regards,
Accelerometers have been triaxial for over 16 years. I believe that most devices will be triaxial today. Monitoring a physical activity with less than 3 axis of motion will result in an underestimation of the workload since the movement is done vertically, laterally and horizontally. The "one " vector motion used in the equation used by the accelerometer software for measuring the energy expenditure is in fact the sum of three vectors (Vertical, horizontal and lateral) . A one axis accelerometer for example will be used for detecting movement for vertical jumps (lower limbs power) or lateral jumps only but if we are looking at walking or running, then we must have movement detection over three axis.
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