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Virtual Reality of Vertical Ground Reaction Force (VGRF) Biofeedback Enables Symmetrical Force Production
Virtual Reality of Vertical Ground Reaction Force (VGRF) Biofeedback Enables Symmetrical Force Production
Correcting asymmetrical VGRF production during exercise via Meta Quest 2 against subjects' baseline assessments.
Validity of Valor Inertia Measurement Unit for Upper and Lower Extremity Joint Angles
Validity of Valor Inertia Measurement Unit for Upper and Lower Extremity Joint Angles
Validating a newly developed wearable IMU system to assess biomechanical performance in recreationally active powerlifters.
Tai-Chi (TC) Gait with Mediolateral Ground Support Perturbations on Dynamic Balance Control
Tai-Chi (TC) Gait with Mediolateral Ground Support Perturbations on Dynamic Balance Control
Compared dynamic stability and limb support force production during comfortable walking speed, TC gait, and TC gait with medial and lateral ground support perturbations in older and younger adults.
Wearable Visual Biofeedback of Vertical Ground Reaction Force Enables More Symmetrical Force Production During Deadlifting and Squatting
Wearable Visual Biofeedback of Vertical Ground Reaction Force Enables More Symmetrical Force Production During Deadlifting and Squatting
Asymmetries in force production, characterized by vertical ground reaction forces (VGRFs), during lower-limb bilateral movements such as deadlifting and squatting, are considered biomechanical risk factors for injury. Real-time biofeedback has been used to modify lower limb force production but typically implements monitors. The purpose of this study was to determine the effect of wearable visual biofeedback (WVBF) on asymmetries in VGRFs and knee joint angles and the rate of perceived exertion (RPE) during deadlift and body-weight squatting (BWS) exercises in recreational powerlifters.
These results indicated that WVBF could reduce VGRF asymmetry during deadlifting and squatting. In addition, targeting force production symmetry may not directly yield joint angle symmetry and may increase perceived exertion. These results could provide valuable insight into VGRF modulation during deadlifting and squatting exercises in athletic and potentially clinical settings when targeting VGRF symmetry.
Thesis Deadlifting Biofeedback.mp4Demonstration of real-time VGRF biofeedback during exercise. Utilizing python enabled force biofeedback to be displayed in virtual reality which was streamed to the Meta Quest 2. *NOTE* Subjects performed exercises in VR with transparent mode activated.
Project Status: Published in MDPI - Biomechanics
Role: Lead author
Validity of Valor Inertia Measurement Unit for Upper and Lower Extremity Joint Angles
Validity of Valor Inertia Measurement Unit for Upper and Lower Extremity Joint Angles
This research project is a joint effort with Valor Biomechanics, based in Austin, Texas, to validate a newly developed wearable IMU system to assess biomechanical performance measures of twenty recreationally active, healthy young adults. Valor IMU metrics were compared to those obtained by Vicon motion capture. Trials included bilateral and unilateral squatting, jumping, arm abduction/adduction, and deadlifting.
Our findings showed mean absolute differences between Valor IMU and Vicon motion capture across all subjects’ joint angles and tasks ranged from 1.81 degrees to 17.46 degrees, root mean squared error of 1.89 degrees to 16.62 degrees and interclass correlation coefficient agreements ranging from 0.57 to 0.99. The results in the current paper further promote the usage of the IMU system outside traditional biomechanical laboratories. Future examinations of this IMU should include smaller modular IMUs with non-slip Velcro bands, and further validation surrounding transverse plane joint kinematics such as joint internal/ external rotations.
Project Status: Published in MDPI Sensors, Special Issue: Advanced Wearable Sensor for Human Movement Monitoring
Role: Lead author
TC Gait with Mediolateral Ground Support Perturbations on Dynamic Balance Control
TC Gait with Mediolateral Ground Support Perturbations on Dynamic Balance Control
This study examined how mediolateral (ML) ground support perturbations challenge dynamic stability and vertical force impulse in ten healthy younger and ten healthy older adults when performing TC gait.
Conditions involved comfortable walking speed, TC gait, and TC gait with ML ground support perturbations. Compared to regular gait, all conditions involving TC revealed a decrease in margin of stability and increased increased vertical force impulse.
Tai-Chi PerturbationThese findings indicate that combining treadmill surface perturbation with TC gait may be an effective and feasible approach to challenge lateral dynamic stability and limb support force production.
Video shows a representative trial of ML ground support perturbations during TC gait in Visual3D.
Project Status: Published in Sports Medicine and Health Science
Role: Lead author
Undergraduate Research
Undergraduate Research
Unilateral Contributions to Bilateral Eccentric Hamstring Exercise
Unilateral Contributions to Bilateral Eccentric Hamstring Exercise
This study examined whether the bilateral eccentric exercise of the hamstring displayed unilateral bias and whether that bias can be attributed to strength asymmetries. Subjects performed four randomized variations of the nordic hamstring exercise with attached surface EMG on the hamstring muscle group.
Our data supports biased recruitment strategies in the gluteus max and contralateral semitendinosus muscles across all exercise variations.
Role: Lead Undergraduate Investigator
Research Presentations
Research Presentations
Wearable Visual Biofeedback of Vertical Ground Reaction Force Enables Symmetrical Force Production During Deadlifting and Squatting
Wearable Visual Biofeedback of Vertical Ground Reaction Force Enables Symmetrical Force Production During Deadlifting and Squatting
Cellular to Clinically Applied Research and Engineering (CARE 2024)
Combined Effects of Tai-Chi Gait with Lateral Ground Support Perturbations on Dynamic Balance Control
Combined Effects of Tai-Chi Gait with Lateral Ground Support Perturbations on Dynamic Balance Control
American Society of Biomechanics (ASB 2023)
Unilateral Contributions to Bilateral Eccentric Hamstring Exercise
Unilateral Contributions to Bilateral Eccentric Hamstring Exercise
Southeast American College of Sports Medicine (SEACSM 2022)
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