Print Email Facebook Twitter Asymmetry and evolution over a one-year period of the upward rotation of the scapula in youth baseball pitchers Title Asymmetry and evolution over a one-year period of the upward rotation of the scapula in youth baseball pitchers Author van der Graaff, E. (TU Delft Biomechanical Engineering; Vrije Universiteit Amsterdam) Kom, Bengt (Vrije Universiteit Amsterdam) van Dis, Femke (Vrije Universiteit Amsterdam) Gasparutto, X. (TU Delft Biomechatronics & Human-Machine Control) Hoozemans, Marco (Vrije Universiteit Amsterdam) Veeger, H.E.J. (TU Delft Biomechanical Engineering; TU Delft Biomechatronics & Human-Machine Control; Vrije Universiteit Amsterdam) Department Biomechanical Engineering Date 2018 Abstract The pitching motion is an asymmetric action by which coordination of scapular rotation in the dominant arm might be affected in time and in comparison with the non-dominant arm. The study aimed to compare asymmetry and the evolution of scapular upward rotation over a one-year period. Data were collected twice, before and after a one-year period, from 92 participants (age = 15.1 SD 1.4 years, body height = 177.3 SD 10.9 cm, body weight 69.2 SD 14.5 kg). Scapular motion was tracked at different glenohumeral angles of elevation in the scapular plane: anatomical position (0°), 45°, 90° and 135°. Scapular upward rotation was calculated as the angle between the spinae scapula and the spine. Scapular upward rotation of the dominant arm was 5.1° (95% CI: 2.1°−8.1°) more compared to the non-dominant arm. Age group or glenohumeral angles of elevation did not affect this difference. Scapular upward rotation of the dominant arm decreased 1.9° (95% CI: −0.5° to 4.3°) after a one-year period, however, neither this observation, nor the interaction with age group or elevation angle was significant. These findings may indicate that pitchers could be at risk to develop shoulder injuries especially those that have been associated with scapular asymmetry. Subject baseballoverhead throwingPitchingscapular dyskinesisscapular upward rotation To reference this document use: http://resolver.tudelft.nl/uuid:7664e917-56e8-4d31-a281-0cc5147f3531 DOI https://doi.org/10.1080/23335432.2018.1499441 ISSN 2333-5432 Source International Biomechanics, 5 (1), 57-62 Part of collection Institutional Repository Document type journal article Rights © 2018 E. van der Graaff, Bengt Kom, Femke van Dis, X. Gasparutto, Marco Hoozemans, H.E.J. Veeger Files PDF Asymmetry_and_evolution_o ... tchers.pdf 1.57 MB Close viewer /islandora/object/uuid:7664e917-56e8-4d31-a281-0cc5147f3531/datastream/OBJ/view