A Muscle Synergy-Inspired Method of Detecting Human Movement Intentions Based on Wearable Sensor Fusion

Detecting human movement intentions is fundamental to neural control of robotic exoskeletons, as it is essential for achieving seamless transitions between different locomotion modes. In this study, we enhanced a muscle synergy-inspired method of locomotion mode identification by fusing the electrom...

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Veröffentlicht in:	IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING Jg. 29; S. 1089 - 1098
Hauptverfasser:	Liu, Yi-Xing, Wang, Ruoli, Gutierrez-Farewik, Elena M.
Format:	Journal Article Verlag
Sprache:	Englisch
Veröffentlicht:	New York IEEE 2021 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Acceleration Accuracy Angular velocity Ascent Classification Electromyography Exoskeleton Exoskeletons Feature extraction Finite state machines Human motion Inclination angle Inertial platforms Inertial sensing devices Intent recognition Legged locomotion Locomotion locomotion modes identification Mechanical sensors Motion perception Multisensor fusion muscle synergies Muscles Robot control robotic exoskeletons sensor fusion Sensors Stairs Stairways Velocity Walking Wearable technology
ISSN:	1534-4320, 1558-0210, 1558-0210
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Abstract	Detecting human movement intentions is fundamental to neural control of robotic exoskeletons, as it is essential for achieving seamless transitions between different locomotion modes. In this study, we enhanced a muscle synergy-inspired method of locomotion mode identification by fusing the electromyography data with two types of data from wearable sensors (inertial measurement units), namely linear acceleration and angular velocity. From the finite state machine perspective, the enhanced method was used to systematically identify 2 static modes, 7 dynamic modes, and 27 transitions among them. In addition to the five broadly studied modes (level ground walking, ramps ascent/descent, stairs ascent/descent), we identified the transition between different walking speeds and modes of ramp walking at different inclination angles. Seven combinations of sensor fusion were conducted, on experimental data from 8 able-bodied adult subjects, and their classification accuracy and prediction time were compared. Prediction based on a fusion of electromyography and gyroscope (angular velocity) data predicted transitions earlier and with higher accuracy. All transitions and modes were identified with a total average classification accuracy of 94.5% with fused sensor data. For nearly all transitions, we were able to predict the next locomotion mode 300-500ms prior to the step into that mode.
AbstractList	Detecting human movement intentions is fundamental to neural control of robotic exoskeletons, as it is essential for achieving seamless transitions between different locomotion modes. In this study, we enhanced a muscle synergy-inspired method of locomotion mode identification by fusing the electromyography data with two types of data from wearable sensors (inertial measurement units), namely linear acceleration and angular velocity. From the finite state machine perspective, the enhanced method was used to systematically identify 2 static modes, 7 dynamic modes, and 27 transitions among them. In addition to the five broadly studied modes (level ground walking, ramps ascent/descent, stairs ascent/descent), we identified the transition between different walking speeds and modes of ramp walking at different inclination angles. Seven combinations of sensor fusion were conducted, on experimental data from 8 able-bodied adult subjects, and their classification accuracy and prediction time were compared. Prediction based on a fusion of electromyography and gyroscope (angular velocity) data predicted transitions earlier and with higher accuracy. All transitions and modes were identified with a total average classification accuracy of 94.5% with fused sensor data. For nearly all transitions, we were able to predict the next locomotion mode 300-500ms prior to the step into that mode.Detecting human movement intentions is fundamental to neural control of robotic exoskeletons, as it is essential for achieving seamless transitions between different locomotion modes. In this study, we enhanced a muscle synergy-inspired method of locomotion mode identification by fusing the electromyography data with two types of data from wearable sensors (inertial measurement units), namely linear acceleration and angular velocity. From the finite state machine perspective, the enhanced method was used to systematically identify 2 static modes, 7 dynamic modes, and 27 transitions among them. In addition to the five broadly studied modes (level ground walking, ramps ascent/descent, stairs ascent/descent), we identified the transition between different walking speeds and modes of ramp walking at different inclination angles. Seven combinations of sensor fusion were conducted, on experimental data from 8 able-bodied adult subjects, and their classification accuracy and prediction time were compared. Prediction based on a fusion of electromyography and gyroscope (angular velocity) data predicted transitions earlier and with higher accuracy. All transitions and modes were identified with a total average classification accuracy of 94.5% with fused sensor data. For nearly all transitions, we were able to predict the next locomotion mode 300-500ms prior to the step into that mode. Detecting human movement intentions is fundamental to neural control of robotic exoskeletons, as it is essential for achieving seamless transitions between different locomotion modes. In this study, we enhanced a muscle synergy-inspired method of locomotion mode identification by fusing the electromyography data with two types of data from wearable sensors (inertial measurement units), namely linear acceleration and angular velocity. From the finite state machine perspective, the enhanced method was used to systematically identify 2 static modes, 7 dynamic modes, and 27 transitions among them. In addition to the five broadly studied modes (level ground walking, ramps ascent/descent, stairs ascent/descent), we identified the transition between different walking speeds and modes of ramp walking at different inclination angles. Seven combinations of sensor fusion were conducted, on experimental data from 8 able-bodied adult subjects, and their classification accuracy and prediction time were compared. Prediction based on a fusion of electromyography and gyroscope (angular velocity) data predicted transitions earlier and with higher accuracy. All transitions and modes were identified with a total average classification accuracy of 94.5% with fused sensor data. For nearly all transitions, we were able to predict the next locomotion mode 300-500ms prior to the step into that mode.
Author	Liu, Yi-Xing Wang, Ruoli Gutierrez-Farewik, Elena M.
Author_xml	– sequence: 1 givenname: Yi-Xing orcidid: 0000-0002-4679-2934 surname: Liu fullname: Liu, Yi-Xing organization: Department of Engineering Mechanics, KTH MoveAbility Lab, KTH Royal Institute of Technology, Stockholm, Sweden – sequence: 2 givenname: Ruoli orcidid: 0000-0002-2232-5258 surname: Wang fullname: Wang, Ruoli organization: Department of Engineering Mechanics, KTH MoveAbility Lab, KTH Royal Institute of Technology, Stockholm, Sweden – sequence: 3 givenname: Elena M. orcidid: 0000-0001-5417-5939 surname: Gutierrez-Farewik fullname: Gutierrez-Farewik, Elena M. email: lanie@kth.se organization: Department of Engineering Mechanics, KTH MoveAbility Lab, KTH Royal Institute of Technology, Stockholm, Sweden
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SubjectTerms	Acceleration Accuracy Angular velocity Ascent Classification Electromyography Exoskeleton Exoskeletons Feature extraction Finite state machines Human motion Inclination angle Inertial platforms Inertial sensing devices Intent recognition Legged locomotion Locomotion locomotion modes identification Mechanical sensors Motion perception Multisensor fusion muscle synergies Muscles Robot control robotic exoskeletons sensor fusion Sensors Stairs Stairways Velocity Walking Wearable technology
Title	A Muscle Synergy-Inspired Method of Detecting Human Movement Intentions Based on Wearable Sensor Fusion
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