Accelerometer Artefacts from Body Worn Sensors
Author(s)
McDonough, Elle
Hinton-Lewis, Chris
Espinosa, Hugo
Thiel, David
Griffith University Author(s)
Year published
2018
Metadata
Show full item recordAbstract
Inertial sensors are commonly found in commercial products such as smart phones
and sports bands. When these sensors are stationary, the variation in the recorded signal (noise
level) is very small (approaching 0.1% of the gravitational acceleration). In many sports applications
the recorded acceleration has noise spikes related to the sensor itself and impulsive body
movements. The wrist acceleration (100 samples/s) from a boxing jab (posterior anterior) to a
stationary bag using 5 subjects demonstrated that following the impact, the sensor oscillated in
a manner dependent on the sensor weight. Mathematically the integrated ...
View more >Inertial sensors are commonly found in commercial products such as smart phones and sports bands. When these sensors are stationary, the variation in the recorded signal (noise level) is very small (approaching 0.1% of the gravitational acceleration). In many sports applications the recorded acceleration has noise spikes related to the sensor itself and impulsive body movements. The wrist acceleration (100 samples/s) from a boxing jab (posterior anterior) to a stationary bag using 5 subjects demonstrated that following the impact, the sensor oscillated in a manner dependent on the sensor weight. Mathematically the integrated acceleration at the end point of the jab should be zero. This was used to remove the vibration artifacts and verified using a high speed camera (2014 fps). A male participant with a rotator cuff shoulder reconstruction was asked to raise his arms (front lateral raise) individually from rest (vertical) to above the horizontal position carrying several different weights. The shoulder instability of the participant was evident in the accelerometer record as significantly larger anterior posterior vibration at 9 Hz. This was not evident in the opposite shoulder which had no reported injury. This technique might prove a useful tool in quantifying shoulder instability over long periods of time.
View less >
View more >Inertial sensors are commonly found in commercial products such as smart phones and sports bands. When these sensors are stationary, the variation in the recorded signal (noise level) is very small (approaching 0.1% of the gravitational acceleration). In many sports applications the recorded acceleration has noise spikes related to the sensor itself and impulsive body movements. The wrist acceleration (100 samples/s) from a boxing jab (posterior anterior) to a stationary bag using 5 subjects demonstrated that following the impact, the sensor oscillated in a manner dependent on the sensor weight. Mathematically the integrated acceleration at the end point of the jab should be zero. This was used to remove the vibration artifacts and verified using a high speed camera (2014 fps). A male participant with a rotator cuff shoulder reconstruction was asked to raise his arms (front lateral raise) individually from rest (vertical) to above the horizontal position carrying several different weights. The shoulder instability of the participant was evident in the accelerometer record as significantly larger anterior posterior vibration at 9 Hz. This was not evident in the opposite shoulder which had no reported injury. This technique might prove a useful tool in quantifying shoulder instability over long periods of time.
View less >
Conference Title
Proceedings of the 3rd International Colloquium on Sports Science, Exercise, Engineering and Technology 2016 (ICoSSEET 2016)
Publisher URI
Subject
Electrical and Electronic Engineering not elsewhere classified