Natural sensory feedback for control of standing

Andreasen, L.N.S.; Jensen, Winnie; Veltink, Petrus H.; Struijk, Johannes

doi:10.1109/iembs.1996.657033

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…• Baratto et al [14]: 2nd order, cutoff frequency of 10 Hz • Prieto et al [13] and Betker et al [15]: 4th order, cutoff frequency of 5 Hz • Andreasen et al [16]: 3rd order, cutoff frequency of 5 Hz • Adkin et al [17]: 2nd order, cutoff frequency of 5 Hz • Gage et al [18]: 4th order, cutoff frequency of 3 Hz Summarizing the mentioned literature, the order of the Butterworth filter should be between 2 and 4, the cutoff frequency between 3 and 10 Hz. Considering the recorded data, even lower cutoff frequencies seemed relevant.…”

Section: Filter Optimizationmentioning

confidence: 97%

Wearable static posturography solution using a novel pressure sensor sole

Reinfelder

Durlak

Barth³

et al. 2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Static posturography is an important measurement in the diagnostic workup for patients with postural instability. New wearable sensor technologies enable researchers to use in-shoe pressure soles in the home environment and outdoor applications. In this study a newly developed in-shoe pressure sole was used for calculating the sway path and 95% confidence ellipse area as the standard parameters of typical static posturography. Insole posturography was validated on 24 subjects by a state of the art pressure plate assessment during three static posturography conditions (eyes open, eyes closed and barefoot). The adaptive low pass filtered data resulted in an overall correlation of 0.63 to 0.78 for the sway path and 0.66 to 0.79 for the 95% confidence ellipse area. Individual correlations of up to 0.97 for the sway path and 0.99 for the 95% confidence ellipse area could be obtained. Future applications could utilize the mobile advantage of in-shoe pressure soles and measure static and dynamic posturography in clinical and home environments.

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Section: Filter Optimizationmentioning

confidence: 97%

Wearable static posturography solution using a novel pressure sensor sole

Reinfelder

Durlak

Barth³

et al. 2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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“…An investigation of the feasibility of obtaining natural sensory feedback from the cutaneous nerves innervating the foot sole is in progress. Preliminary results are very encouraging suggesting the possibility to derive GRF and COP signals from combinations of cuff electrode recordings obtained from branches of the tibial and sural nerves [17] . By making use of subdermal electrodes and natural sensing techniques the prospective ECF syste m would be fully implantable, which should increase its reliability and user acceptability.…”

Section: A Perspective On Future Developmentmentioning

confidence: 97%

Development and evaluation of a two-dimensional electrocutaneous cognitive feedback system for use in paraplegic standing

Matjačić

Jensen

Riso³

et al. 2000

Journal of Medical Engineering & Technology

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Fatigue of electrically activated paralysed muscles is a major factor limiting the duration of functional electrical stimulation (FES) supported paraplegic standing. Fatigue can be significantly delayed by changing the posture. Since paralysed individuals are deprived of proprio- and exteroception from the lower limbs they are not aware of the posture and loading of their paralysed legs. If suitable cognitive feedback (CF) information about posture in the sagittal and frontal planes is provided, they might be able to successfully exercise posture switching. A two-dimensional electrocutaneous CF system was developed. Relative limb loading and the location of the weighted centre of pressure were selected as informational variables. Discrete encoding schemes in the form of spatial and frequency codes were employed and the informational signals were divided into three sub-regions. The ability to correctly interpret the CF was investigated using one- and two-dimension tracking tests in three paralysed subjects, each of whom were studied over five consecutive days. All three subjects were able to use the CF in one-dimension tests. Two subjects could do the same also in two-dimension tests. The encoding scheme which was developed to communicate the selected biomechanical variables proved to be easily understood and thus appropriate for use in paraplegic standing.

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“…J. Struijk and L. Andreasen showed that an optimized confi guration and closure of the cuff electrode contributes to the neural signal acquisition. [ 34,35 ] T. Stieglitz et al developed processing technology for fl exible, light-weight, micromachined, multichannel cuff electrodes. [ 36 ] With this device, X. Navarro et al were able to selectively stimulate the fascicular of a rat's sciatic nerve.…”

Section: Doi: 101002/adma201503423mentioning

confidence: 99%