Control Aspects of Prosthetics and Orthotics, 1983
This work reports the results obtained by analysing the reactive moments at the hip, knee and ank... more This work reports the results obtained by analysing the reactive moments at the hip, knee and ankle joints for healthy and prosthetized subjects. The aim of the work consists in two main points: to compare the motor coordination of amputated and normal subjects, to evaluate the efficiency of the prosthesis. Three amputated subjects have been tested during walking at their natural cadence with the videovectograms technique and the results have been compared with those of normal healthy subjects. The videovectograms technique allows to record and review, by a video tape recorder, the superimposed images of two TV cameras. The first camera, placed perpendicularly to the considered plane (in our case the sagittal), shoots the subject performing the stance phase of a stride on a piezoelectric force plate. Simultaneously the second camera shoots the evolution of the ground reaction force as it appears on a screen, after a particular on-line elaboration. This elaboration, elsewere described in details allows to represent the ground reaction force, sampled at fixed intervals of time, in amplitude inclination and point of application. The superimposition of the two TV images shows in each frame the position of the ground reaction force respect to the subject in that instant.The superimposition is realized by a spatial temporal syncronization. In this way it is possible to measure the reactive moments only multiplying the amplitude of the vector by its distance from the centers of rotation of the joints, evidencied by reflective markers. A semiautomatic method of acquisition allows to measure and to store on a computer memory, the coordinates of the markers and the amplitude and position of the vectors. A proper program corrects for perspective and optical errors, and compute the reactive moments. The results suggest these considerations: – normal subjects have typical patterns of moment time course; – amputated subjects posses different patterns of the moments depending on the kind of the prosthesis and the degree of familiarization with the device. – the videovectograms are useful to evaluate the efficiency of a prosthesis and to help the technicians for an optimal adaptation to the subjects.
In recent years the more advanced gait analysis laboratories have been involved in developing ins... more In recent years the more advanced gait analysis laboratories have been involved in developing instrumentation and methods for the assessment of walking performances.
2017 E-Health and Bioengineering Conference (EHB), 2017
This study aims at evaluating the regularity of periodic human movements through the analysis of ... more This study aims at evaluating the regularity of periodic human movements through the analysis of the autocorrelation function of accelerometric signals obtained from wearable sensors. For this purpose a method has been implemented which can run also in real-time, and it has been tested in several experimental conditions and in various motor gestures including gait. Relevant for clinical and sport applications is the fact that the autocorrelation parameters are calculated on the acceleration module, and not on the individual axial components. This allowed us to assess the regularity of periodic movements without the need of aligning the sensor axes to the anatomical axes. Finally a multi-sensor approach has been developed that can be used to simultaneously assess the regularity on different anatomical landmarks.
Control Aspects of Prosthetics and Orthotics, 1983
This work reports the results obtained by analysing the reactive moments at the hip, knee and ank... more This work reports the results obtained by analysing the reactive moments at the hip, knee and ankle joints for healthy and prosthetized subjects. The aim of the work consists in two main points: to compare the motor coordination of amputated and normal subjects, to evaluate the efficiency of the prosthesis. Three amputated subjects have been tested during walking at their natural cadence with the videovectograms technique and the results have been compared with those of normal healthy subjects. The videovectograms technique allows to record and review, by a video tape recorder, the superimposed images of two TV cameras. The first camera, placed perpendicularly to the considered plane (in our case the sagittal), shoots the subject performing the stance phase of a stride on a piezoelectric force plate. Simultaneously the second camera shoots the evolution of the ground reaction force as it appears on a screen, after a particular on-line elaboration. This elaboration, elsewere described in details allows to represent the ground reaction force, sampled at fixed intervals of time, in amplitude inclination and point of application. The superimposition of the two TV images shows in each frame the position of the ground reaction force respect to the subject in that instant.The superimposition is realized by a spatial temporal syncronization. In this way it is possible to measure the reactive moments only multiplying the amplitude of the vector by its distance from the centers of rotation of the joints, evidencied by reflective markers. A semiautomatic method of acquisition allows to measure and to store on a computer memory, the coordinates of the markers and the amplitude and position of the vectors. A proper program corrects for perspective and optical errors, and compute the reactive moments. The results suggest these considerations: – normal subjects have typical patterns of moment time course; – amputated subjects posses different patterns of the moments depending on the kind of the prosthesis and the degree of familiarization with the device. – the videovectograms are useful to evaluate the efficiency of a prosthesis and to help the technicians for an optimal adaptation to the subjects.
In recent years the more advanced gait analysis laboratories have been involved in developing ins... more In recent years the more advanced gait analysis laboratories have been involved in developing instrumentation and methods for the assessment of walking performances.
2017 E-Health and Bioengineering Conference (EHB), 2017
This study aims at evaluating the regularity of periodic human movements through the analysis of ... more This study aims at evaluating the regularity of periodic human movements through the analysis of the autocorrelation function of accelerometric signals obtained from wearable sensors. For this purpose a method has been implemented which can run also in real-time, and it has been tested in several experimental conditions and in various motor gestures including gait. Relevant for clinical and sport applications is the fact that the autocorrelation parameters are calculated on the acceleration module, and not on the individual axial components. This allowed us to assess the regularity of periodic movements without the need of aligning the sensor axes to the anatomical axes. Finally a multi-sensor approach has been developed that can be used to simultaneously assess the regularity on different anatomical landmarks.
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Papers by C. Frigo