Print Email Facebook Twitter Timing of peak pelvis and thorax rotation velocity in baseball pitching Title Timing of peak pelvis and thorax rotation velocity in baseball pitching Author van der Graaff, Erik (Vrije Universiteit Amsterdam) Hoozemans, Marco J.M. (Koninklijke Nederlandse Baseball en Softball Bond (KNBSB)) Nijhoff, Martijn (Koninklijke Nederlandse Baseball en Softball Bond (KNBSB)) Davidson, Michael (Manual Fysion) Hoezen, Merel (Manual Fysion) Veeger, H.E.J. (TU Delft Biomechanical Engineering; TU Delft Biomechatronics & Human-Machine Control; Vrije Universiteit Amsterdam) Department Biomechanical Engineering Date 2018 Abstract The objective of the present study was to examine the magnitude and timing of peak pelvis and thorax rotations in achieving high throwing velocities in pitching fastballs. During the preseason (Test 1 or T1) and four months later (Test 2 or T2), kinematic analysis was performed on eight elite youth pitchers throwing fastballs. Peak rotation velocities of the pelvis and thorax were determined and separation time, defined as the time between the maximal rotation velocities of the pelvis and thorax, was calculated. Peak thorax rotation velocity was not associated with throwing velocity. However, separation time appeared to be significantly and positively associated with throwing velocity. Also, the changes in separation time from T1 to T2 were significantly and positively associated with the observed increase in throwing velocity from T1 to T2. There was no significant association between the changes in pelvis or thorax peak rotation velocities from T1 to T2 and the change in throwing velocity. Results indicate that the relative timing of pelvis and thorax peak rotation velocity in pitching fastballs in baseball is likely to be a determinant of throwing velocity in skilled pitchers. Subject throwingmotion analysiskinematicsperformance To reference this document use: http://resolver.tudelft.nl/uuid:5174ddd6-091e-4527-9d30-168bd5222b0e DOI https://doi.org/10.7600/jpfsm.7.269 ISSN 2186-8131 Source The Journal of Physical Fitness and Sports Medicine, 7 (5), 269-277 Part of collection Institutional Repository Document type journal article Rights © 2018 Erik van der Graaff, Marco J.M. Hoozemans, Martijn Nijhoff, Michael Davidson, Merel Hoezen, H.E.J. Veeger Files PDF 7_269.pdf 1.99 MB Close viewer /islandora/object/uuid:5174ddd6-091e-4527-9d30-168bd5222b0e/datastream/OBJ/view