The reproducibility of signals from skin-mounted accelerometers following removal and replacement

Decker, Colleen; Prasad, Narasimha; Kawchuk, Gregory N.

doi:10.1016/j.gaitpost.2011.05.024

Cited by 12 publications

(11 citation statements)

References 9 publications

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“…To the best of our knowledge, such t i has not yet been obtained. ANSYS software was also used to analyse the problem; the amplitude of u(l,t) is 24 mm (equivalent to 1.2a), which is similar to the result presented in equation (14).…”

Section: Theoretical Resultssupporting

confidence: 60%

Use of wavelet energy for spinal cord vibration analysis during spinal surgery

Dai

Zhang

Xue

2012

Int J Med Robotics Comput Assist Surg

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Section: Theoretical Resultssupporting

confidence: 60%

Use of wavelet energy for spinal cord vibration analysis during spinal surgery

Dai

Zhang

Xue

2012

Int J Med Robotics Comput Assist Surg

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“…The five measures were composed by one minute of running at the selected speed followed by a two-minute rest. No removal or replacement of the accelerometers was performed to preclude the influence of the location [ 32 ]. Figure 4 depicts an example of measurement.…”

Section: Methodsmentioning

confidence: 99%

Validation of a High Sampling Rate Inertial Measurement Unit for Acceleration During Running

Provot

Chiementin

Oudin³

et al. 2017

Sensors

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The musculo-skeletal response of athletes to various activities during training exercises has become a critical issue in order to optimize their performance and minimize injuries. However, dynamic and kinematic measures of an athlete’s activity are generally limited by constraints in data collection and technology. Thus, the choice of reliable and accurate sensors is crucial for gathering data in indoor and outdoor conditions. The aim of this study is to validate the use of the accelerometer of a high sampling rate (13440.277778emHz) Inertial Measurement Unit (IMU) in the frame of running activities. To this end, two validation protocols are imposed: a classical one on a shaker, followed by another one during running, the IMU being attached to a test subject. For each protocol, the response of the IMU Accelerometer (IMUA) is compared to a calibrated industrial accelerometer, considered as the gold standard for dynamic and kinematic data collection. The repeatability, impact of signal frequency and amplitude (on shaker) as well as the influence of speed (while running) are investigated. Results reveal that the IMUA exhibits good repeatability. Coefficient of Variation CV is 1%()8.58±0.06m/normals2 on the shaker and 3%()26.65±0.69m/normals2 while running. However, the shaker test shows that the IMUA is affected by the signal frequency (error exceeds 10% beyond 800.277778emHz), an observation confirmed by the running test. Nevertheless, the IMUA provides a reliable measure in the range 0–100 Hz, i.e., the most relevant part in the energy spectrum over the range 0–150 Hz during running. In our view, these findings emphasize the validity of IMUs for the measurement of acceleration during running.

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“…This means that in the future, additional means of vibration response validation may be needed. Second, this study employed skin-based accelerometers that if removed (sensors were never removed during data collection), are difficult to replace in the same subject in a repeatable manner 21 . Depending on the effect size of the response, this circumstance may limit accelerometer-driven SHM from being used to monitor the spine at successive time points.…”

Section: Discussionmentioning

confidence: 99%

“…frequency response function (FRF)) 20 . This approach has been shown to be reliable when sensor positions are not altered 21 .…”

Section: Methodsmentioning

confidence: 99%

Structural health monitoring (vibration) as a tool for identifying structural alterations of the lumbar spine: a twin control study

Kawchuk

Hartvigsen

Edgecombe

et al. 2016

Sci Rep

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Structural health monitoring (SHM) is an engineering technique used to identify mechanical abnormalities not readily apparent through other means. Recently, SHM has been adapted for use in biological systems, but its invasive nature limits its clinical application. As such, the purpose of this project was to determine if a non-invasive form of SHM could identify structural alterations in the spines of living human subjects. Lumbar spines of 10 twin pairs were visualized by magnetic resonance imaging then assessed by a blinded radiologist to determine whether twin pairs were structurally concordant or discordant. Vibration was then applied to each subject’s spine and the resulting response recorded from sensors overlying lumbar spinous processes. The peak frequency, area under the curve and the root mean square were computed from the frequency response function of each sensor. Statistical analysis demonstrated that in twins whose structural appearance was discordant, peak frequency was significantly different between twin pairs while in concordant twins, no outcomes were significantly different. From these results, we conclude that structural changes within the spine can alter its vibration response. As such, further investigation of SHM to identify spinal abnormalities in larger human populations is warranted.

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The reproducibility of signals from skin-mounted accelerometers following removal and replacement

Cited by 12 publications

References 9 publications

Use of wavelet energy for spinal cord vibration analysis during spinal surgery

Use of wavelet energy for spinal cord vibration analysis during spinal surgery

Validation of a High Sampling Rate Inertial Measurement Unit for Acceleration During Running

Structural health monitoring (vibration) as a tool for identifying structural alterations of the lumbar spine: a twin control study

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