A Smart Cushion System with Vibrotactile Feedback for Active Posture Correction

Ishac, Karlos; Suzuki, Kenji

doi:10.1007/978-981-10-4157-0_76

Cited by 7 publications

(11 citation statements)

References 7 publications

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“…The first experiment tested the pressure sensing system’s functionality. The second experiment used the newly developed pressure sensing system to detect 11 different sitting postures across 20 participants and compared the accuracy to our previous study [ 10 ]. The third experiment evaluated the effect of the LifeChair system in increasing time spent sitting upright and reducing slouching across 10 participants in a 2 h performance study.…”

Section: Resultsmentioning

confidence: 99%

“…This data is then sent to the application via BLE. Once received, the pressure data is processed in the recognition section using our developed posture model from our previous study [ 10 ]. The algorithm then classifies the current seating posture.…”

Section: Methodsmentioning

confidence: 99%

“…The training data was collected from 6 participants during a pilot study and then tested against in the experiments conducted in our previous publication [ 10 ]. The study conducted in [ 10 ] used 6 different subjects as a test for the training data. During this study, the classification accuracy was observed to be 94.1%.…”

Section: Methodsmentioning

confidence: 99%

“…The LifeChair is a smart cushion for the back of your chair that uses our novel pressure sensing system, vibrotactile feedback and posture classifier to actively train sitting posture. It does this by detecting poor posture and sending haptic alerts to encourage the user to sit upright [ 10 ]. By using unique vibration patterns we communicate to the user spatial information, such as how to correct their posture.…”

Section: Introductionmentioning

confidence: 99%

“…The LifeChair provides active real time feedback to solve this problem while monitoring the user’s sitting posture and activity through pressure sensing. Our previous study [ 10 ] demonstrated effectiveness in encouraging upright posture. In the study presented in this manuscript, we improve upon our posture classification model by developing our own pressure sensing technology, implementing it into the LifeChair and conducting a user study to detect 11 different sitting postures.…”

Section: Introductionmentioning

confidence: 99%

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LifeChair: A Conductive Fabric Sensor-Based Smart Cushion for Actively Shaping Sitting Posture

Ishac

Suzuki

2018

Sensors

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The LifeChair is a smart cushion that provides vibrotactile feedback by actively sensing and classifying sitting postures to encourage upright posture and reduce slouching. The key component of the LifeChair is our novel conductive fabric pressure sensing array. Fabric sensors have been explored in the past, but a full sensing solution for embedded real world use has not been proposed. We have designed our system with commercial use in mind, and as a result, it has a high focus on manufacturability, cost-effectiveness and adaptiveness. We demonstrate the performance of our fabric sensing system by installing it into the LifeChair and comparing its posture detection accuracy with our previous study that implemented a conventional flexible printed PCB-sensing system. In this study, it is shown that the LifeChair can detect all 11 postures across 20 participants with an improved average accuracy of 98.1%, and it demonstrates significantly lower variance when interfacing with different users. We also conduct a performance study with 10 participants to evaluate the effectiveness of the LifeChair device in improving upright posture and reducing slouching. Our performance study demonstrates that the LifeChair is effective in encouraging users to sit upright with an increase of 68.1% in time spent seated upright when vibrotactile feedback is activated.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%