Factors Correlated With Shoulder Maximum External Rotation Angle During Throwing

Miyashita, Kouji; Urabe, Yukio; Kobayashi, Hitome; Yokoe, Kiyoshi; Kawamura, Morio; Ida, Kunio

doi:10.7600/jspfsm.57.141

Cited by 1 publication

(2 citation statements)

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“…In these studies, with a cross-sectional design, it was demonstrated that age and skill level are positively associated with rotation velocity of the segments and throwing velocity. In the present study, the pitchers were part of a relatively small and homogeneous group and are the most talented pitchers of their age group (15)(16)(17)(18) years. The average finger tip velocity of the elite youth pitchers in this study of 71.2 mph (31.8 m/s) is likely a underestimation of their actual ball velocity when pitching fastballs.)…”

Section: Conflict Of Interestsmentioning

confidence: 97%

“…The translation and subsequent rotation in the transverse plane of the pelvis together are used to initiate the rotation of the upper body [9][10][11][12] . Multiple studies demonstrated the role of upper body rotation velocity in baseball pitching 7,8,11,13,14) , and the subsequent characteristics of shoulder and arm movements [15][16][17][18][19][20] . While these studies aimed to investigate the roles of individual segment rotations separately in reaching high throwing velocities, they did not report on the timing of rotations between those segments, which is an important aspect of the working mechanism of the kinematic chain.…”

Section: Introductionmentioning

confidence: 99%

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Timing of peak pelvis and thorax rotation velocity in baseball pitching

Graaff

Hoozemans

Nijhoff

et al. 2018

JPFSM

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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.

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Section: Conflict Of Interestsmentioning

confidence: 97%