A Comparison of vertical force and temporal parameters produced by an in-shoe pressure measuring system and a force platform

Barnett, Sue; Cunningham, J L; West, Steven

doi:10.1016/s0268-0033(01)00026-2

Cited by 105 publications

(34 citation statements)

References 9 publications

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“…Vert GRF simulation in the literature has error values ranging from 6.6%BW to 13.8%BW; the relative error ranging from 7.3% to 10.1%, while the present study showed values of 4.5%BW and 4.0%. The correlation coefficient of all studies is close, ranging from 0.97 to 0.99, similar to the neural network simulation (Barnett et al, 2001;Fong et al, 2008;Forner-Cordero et al, 2004;Jung et al, 2014;Liedtke et al, 2007;Oh et al, 2013;Rouhani et al, 2010).…”

Section: Discussionsupporting

confidence: 74%

Prediction of 3D ground reaction forces during gait based on accelerometer data

2018

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Introduction: The aim of this study was to predict 3D ground reaction force signals based on accelerometer data during gait, using a feed-forward neural network (MLP). Methods: Seventeen healthy subjects were instructed to walk at a self-selected speed with a 3D accelerometer attached to the distal and anterior part of the shank. A force plate was embedded into the middle of the walkway. MLP neural networks with one hidden layer and three output layers were selected to simulate the anteroposterior (AP), vertical (Vert) and mediolateral (ML) ground reaction forces (GRF). The input layer was composed of fourteen inputs obtained from accelerometer signals, selected based on previous studies. Principal component analysis (PCA) was used to compare the simulated and collected curves. The Pearson correlation coefficient and the mean absolute deviation (MAD) between signals were calculated. Results: PCA identified small, but significant differences between collected and simulated signals in the loading response phases of AP and ML GRF, while Vert did not show differences. The correlation between the simulated and collected signals was high (AP: 0.97; Vert: 0.98; ML: 0.80). MAD was 1.8%BW for AP, 4.5%BW for Vert and 1.4%BW for ML. Conclusion: This study confirmed that multilayer perceptron neural network can predict the highly non-linear relationship of shank acceleration parameters and ground reaction forces, as well as other studies have done using plantar pressure devices. The greater advantages of this device are the low cost and the possibility of use outside the laboratory environment.

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Section: Discussionsupporting

confidence: 74%

Prediction of 3D ground reaction forces during gait based on accelerometer data

2018

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“…Velocity was not obtained because the walking distance was not routinely measured. Validity testing has demonstrated that the vertical ground reaction force measured by the Pedar‐X system has repeatability, accuracy, and reliability and is not significantly different from measurements made with traditional force plates [19,20].…”

Section: Methodsmentioning

confidence: 99%

Immediate Effects of Contralateral and Ipsilateral Cane Use On Normal Adult Gait

Aragaki

Nasmyth

Schultz

et al. 2008

PM&R

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Both ipsilateral and contralateral cane use reduced cadence and mean peak vertical plantar force on the limb advanced with the cane in healthy young adults. Double limb support increased with cane use likely due to the reduced cadence and initial unfamiliarity with using an assistive device. A clinical implication of these findings is that prescription of canes for either ipsilateral or contralateral use effectively offloads a designated lower limb.

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“…To be able to use the measurements as plant feedback, online and real-time access to the output signals are crucial. Barnett et al [29] compared the Pedar system with the Kistler force platform and concluded that the accuracy of the Pedar system supports its use in clinical applications. In general, capacitive transducers have a fairly stable and linear response, but are relatively thick and less flexible compared to FSRs.…”

Section: Advantages and Disadvantages Of The Fsr Technologymentioning

confidence: 99%

Withdrawal reflexes examined during human gait by ground reaction forces: site and gait phase dependency

Emborg

Spaich

Andersen

2008

Med Biol Eng Comput

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The objective of this study was to investigate the modulation of the nociceptive withdrawal reflex during gait measured using Force Sensitive Resistors (FSR). Electrical stimulation was delivered to four locations on the sole of the foot at three different time points between heel-off and toe-off. Peak force changes were measured by FSRs attached to the big toe, distal to the first and fourth metatarsophalangeal joints, and the medial process of the calcaneus on both feet. Force changes were assessed in five gait sub-phases. The painful stimulation led to increased ipsilateral unloading (10 +/- 1 N) and contralateral loading (12 +/- 1 N), which were dependent on stimulation site and phase. In contrast, the hallux of the ipsilateral foot plantar flexed, thus facilitating the push-off. The highest degree of plantar flexion (23 +/- 10 N; range, 8-44 N) was seen in the second double support phase following the stimulation. Site and phase modulation of the reflex were detected in the force signals from all selected anatomical landmarks. In the kinematic responses, both site and phase modulation were observed. For stimulations near toe-off, withdrawal was primarily accomplished by ankle dorsiflexion, while the strategy for stimulations at heel-off was flexion of the knee and hip joints.

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A Comparison of vertical force and temporal parameters produced by an in-shoe pressure measuring system and a force platform

Cited by 105 publications

References 9 publications

Prediction of 3D ground reaction forces during gait based on accelerometer data

Prediction of 3D ground reaction forces during gait based on accelerometer data

Immediate Effects of Contralateral and Ipsilateral Cane Use On Normal Adult Gait

Withdrawal reflexes examined during human gait by ground reaction forces: site and gait phase dependency

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