The Validity of Wireless Earbud-Type Wearable Sensors for Head Angle Estimation and the Relationships of Head with Trunk, Pelvis, Hip, and Knee during Workouts

Kim, Ae-Ryeong; Park, Ju-Hyun; Kim, Si Hyun; Kim, Kwang Bok; Park, Kyu Nam

doi:10.3390/s22020597

Cited by 7 publications

(3 citation statements)

References 49 publications

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“…This app computed the mediolateral head angle in real time, using methods established in previous studies. 41 , 42 Each sample carried signed 16-bit acceleration outputs for all three axes x, y, and z. These acceleration outputs were scaled to equate to a proportional value of Earth's gravity (G px , G py , and G pz ).…”

Section: Functional Movement Testsmentioning

confidence: 99%

Core stability status classification based on mediolateral head motion during rhythmic movements and functional movement tests

2023

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Objective Core stability assessment is paramount for the prevention of low back pain, with core stability being considered as the most critical factor in such pain. The objective of this study was to develop a simple model for the automated assessment of core stability status. Methods To assess core stability—defined as the ability to control trunk position relative to the pelvic position - we used an inertial measurement unit sensor embedded within a wireless earbud to estimate the mediolateral head angle during rhythmic movements (RMs) such as cycling, walking, and running. The activities of muscles around the trunk were analyzed by an experienced, highly trained individual. Functional movement tests (FMTs) were performed, including single-leg squat, lunge, and side lunge. Data was collected from 77 participants, who were then classified into good and poor core stability groups based on their Sahrmann core stability test scores. Results From the head angle data, we extrapolated the symmetry index (SI) and amplitude of mediolateral head motion (Amp). Support vector machine and neural network models were trained and validated using these features. In both models, the accuracy was similar across three feature sets for RMs, FMTs, and full, and support vector machine accuracy (∼87%) is greater than neural network (∼75%). Conclusion The use of this model, trained with head motion-related features obtained during RMs or FMTs, can help to accurately classify core stability status during activities.

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Section: Functional Movement Testsmentioning

confidence: 99%

Core stability status classification based on mediolateral head motion during rhythmic movements and functional movement tests

2023

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“…The acceleration outputs were transferred to a self-developed mobile app via Bluetooth. The app calculated the mediolateral head angle in real time, similar to a previous study 29 , and controlled the volume of music from the wireless earbud to provide feedback.…”

Section: Instrumentsmentioning

confidence: 99%

Effects of core stability and feedback music on upper body mediolateral movements during cycling

Jeong

Kim

Park

2022

Preprint

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Asymmetry in involuntary trunk motion may be related to core stability. If core stability properly controls postural stability during distal segment movements, trunk motion should be symmetric. Based on the assumption that head motion partially represents trunk motion, we developed a system that measures head angle and provides feedback music on head motion. If the head angle exceeds a predefined threshold, the music is muted in the earbud on the side of the head tilt. To investigate the relationship between core stability and asymmetric trunk motion, we measured mediolateral head angles during cycling using a self-developed system and compared them between individuals with good and poor core stability, and we investigated the effects of feedback music on mediolateral head motion during cycling. The poor-core-stability group showed significantly greater amplitude of, and less symmetry in, mediolateral head motion than the good-core-stability group. Furthermore, feedback music significantly reduced the amplitude of mediolateral head motion in the good- and poor-core-stability groups and improved symmetry in mediolateral head motion in the poor-core-stability group. Our findings imply that core stability is important for maintaining symmetry in head motion during cycling. Feedback music could be useful for establishing symmetry in head motion during cycling.

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“…Lateral trunk tilt during standing hip abduction is important to maintain balance under unstable conditions. 9,10 During standing hip abduction, the center of mass moves towards the non-supporting leg. 11 To maintain body balance, the trunk leans away from the abducted leg; this movement would depend on muscle strength of the supporting leg.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Soccer Shooting Speed and Trunk Angles in the Frontal Plane during One-Leg Drop Landing and Standing Hip Abduction Tasks

Jeong,

Kim

et al. 2024

J Musculoskelet Sci Technol

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The Validity of Wireless Earbud-Type Wearable Sensors for Head Angle Estimation and the Relationships of Head with Trunk, Pelvis, Hip, and Knee during Workouts

Cited by 7 publications

References 49 publications

Core stability status classification based on mediolateral head motion during rhythmic movements and functional movement tests

Core stability status classification based on mediolateral head motion during rhythmic movements and functional movement tests

Effects of core stability and feedback music on upper body mediolateral movements during cycling

Relationship between Soccer Shooting Speed and Trunk Angles in the Frontal Plane during One-Leg Drop Landing and Standing Hip Abduction Tasks

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