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• W2890791623 abstract "Proprioception of the upper extremity is commonly measured using joint position sense tasks. Recent evidence suggests heightened position sense at elevation angles in the shoulder and elbow near 90° in the sagittal plane. The influence of external torque has been suggested to play a pivotal role in the heightened acuity in elevated positions due to increased moment arm with respect to gravitational vectors. We hypothesized that the addition of a buoyance vector in opposition to this gravitational vector would reduce the influence of torque on proprioceptive acuity, resulting in consistent position sense errors with respect to elevation angle. Joint position sense was measured using an apple iPod touch using a custom application. Participants elevated their arm to 50, 70 and 90° of elevation in the sagittal plane in the absence of visual feedback. Data were collected in three conditions, normal (control) and submerged and weighted. We found angular differences between control and submerged conditions, but not between control and weighted conditions. When the arm was elevated to 90° in the submerged condition, we found participants undershot the target position by approximately -0.5° with the addition of the buoyancy force vector. Participants without this buoyancy vector at the same target position consistently overshot the target by approximately 2.0°, which suggests that external torque may be more involved in the direction of proprioceptive errors more than the magnitude of the error as the magnitude of the difference was relatively small (2.5°)." @default.
• W2890791623 created "2018-09-27" @default.
• W2890791623 creator A5077367970 @default.
• W2890791623 creator A5085519944 @default.
• W2890791623 date "2018-12-01" @default.
• W2890791623 modified "2023-09-24" @default.
• W2890791623 title "Gravitational torque partially accounts for proprioceptive acuity" @default.
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• W2890791623 doi "https://doi.org/10.1016/j.humov.2018.09.005" @default.
• W2890791623 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30236590" @default.
• W2890791623 hasPublicationYear "2018" @default.
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