Correlation Among Y-Balance Test-Lower Quarter Composite Scores, Hip Musculoskeletal Characteristics, and Pitching Kinematics in NCAA Division I Baseball Pitchers.

Context: Numerous studies have reported kinematic data on baseball pitchers using three-dimensional (3D) motion analysis, but no studies to date have correlated this data with clinical outcome measures. Objective: To examine the relationship among Y-Balance Test-Lower Quarter (YBT-LQ) composite scores, musculoskeletal characteristics of the hip, and pitching kinematics in National Collegiate Athletic Association (NCAA) Division I baseball pitchers. Design: Cross-sectional. Setting: 3D motion analysis laboratory. Participants: Nineteen healthy male college baseball pitchers. Main Outcome Measures: Internal and external hip passive range of motion, hip abduction strength, YBT-LQ composite scores, and kinematic variables of the pitching motion. Results: Stride length demonstrated a moderate positive correlation with dominant limb YBT-LQ composite score (r = .524, P = .02) and nondominant limb YBT-LQ composite score (r = .550, P = .01), and a weak positive correlation with normalized time to maximal humerus velocity (r = .458, P = .04). Stride length had a moderate negative correlation with normalized time to maximal thorax velocity (r = -.522, P = .02) and dominant hip total rotational motion (TRM; r = -.660, P = .002), and had a strong negative correlation with normalized time from stride foot contact to maximal knee flexion (r = -.722, P < .001). Dominant limb YBT-LQ composite score had a weak negative correlation with hip abduction strength difference (r = -.459, P = .04) and normalized time to maximal thorax velocity (r = -.468, P = .04). Nondominant limb YBT-LQ composite score demonstrated a weak negative correlation with normalized time to maximal thorax velocity (r = -.450, P = .05) and had a moderate negative correlation with dominant hip TRM (r = -.668, P = .001). There were no other significant relationships between the remaining variables. Conclusions: YBT-LQ is a clinical measure that can be used to correlate with hip musculoskeletal characteristics and pitching kinematics in NCAA Division I pitchers.

[1]  J. C. Garrison,et al.  Lower extremity balance is improved at time of return to throwing in baseball players after an ulnar collateral ligament reconstruction when compared to pre-operative measurements. , 2014, International journal of sports physical therapy.

[2]  B Elliott,et al.  Technique effects on upper limb loading in the tennis serve. , 2003, Journal of science and medicine in sport.

[3]  Dan K Ramsey,et al.  Effect of stride length on overarm throwing delivery: Part II: An angular momentum response. , 2016, Human movement science.

[4]  Kevin G Laudner,et al.  Functional Hip Characteristics of Baseball Pitchers and Position Players , 2010, The American journal of sports medicine.

[5]  Dan K Ramsey,et al.  Effect of stride length on overarm throwing delivery: A linear momentum response. , 2014, Human movement science.

[6]  Glenn S. Fleisig,et al.  Biomechanics of the elbow in the throwing athlete , 1996 .

[7]  G. Fleisig,et al.  Kinetics of Baseball Pitching with Implications About Injury Mechanisms , 1995, The American journal of sports medicine.

[8]  Nicole J Chimera,et al.  Association of y balance test reach asymmetry and injury in division I athletes. , 2015, Medicine and science in sports and exercise.

[9]  K. Laudner,et al.  Correlation of Shoulder and Elbow Kinetics With Ball Velocity in Collegiate Baseball Pitchers. , 2015, Journal of athletic training.

[10]  Richard J Hawkins,et al.  Correlation of Torque and Elbow Injury in Professional Baseball Pitchers , 2010, The American journal of sports medicine.

[11]  G. Fleisig,et al.  Passive Ranges of Motion of the Hips and Their Relationship with Pitching Biomechanics and Ball Velocity in Professional Baseball Pitchers , 2010, The American journal of sports medicine.

[12]  T. Ohtsuki,et al.  Sequential muscle activity and its functional role in the upper extremity and trunk during overarm throwing , 2002, Journal of sports sciences.

[13]  Marc R Portus,et al.  The associations between fast bowling technique and ball release speed: A pilot study of the within-bowler and between-bowler approaches , 2007, Journal of sports sciences.

[14]  Correlation of Throwing Velocity to the Results of Lower-Body Field Tests in Male College Baseball Players , 2013, Journal of strength and conditioning research.

[15]  R. Nee,et al.  Analysis of hip strength in females seeking physical therapy treatment for unilateral patellofemoral pain syndrome. , 2007, The Journal of orthopaedic and sports physical therapy.

[16]  The relationship between clinically measured hip rotational motion and shoulder biomechanics during the pitching motion. , 2015, Journal of science and medicine in sport.

[17]  C. A. Putnam,et al.  Sequential motions of body segments in striking and throwing skills: descriptions and explanations. , 1993, Journal of biomechanics.

[18]  Dan K Ramsey,et al.  An inferential investigation into how stride length influences temporal parameters within the baseball pitching delivery. , 2015, Human movement science.

[19]  C. Dillman.  Valgus extension overload in baseball pitching , 1991 .

[20]  J. Romero,et al.  RELATIONSHIP BETWEEN THE Y BALANCE TEST SCORES AND SOFT TISSUE INJURY INCIDENCE IN A SOCCER TEAM. , 2015, International journal of sports physical therapy.

[21]  Roger Bartlett,et al.  Three-Dimensional Evaluation of the Kinematic Release Parameters for Javelin Throwers of Different Skill Levels , 1996 .

[22]  T. Kaminski,et al.  Star Excursion Balance Test as a predictor of lower extremity injury in high school basketball players. , 2006, The Journal of orthopaedic and sports physical therapy.

[23]  RobRoy L Martin,et al.  Functional performance testing of the hip in athletes: a systematic review for reliability and validity. , 2012, International journal of sports physical therapy.

[24]  J. C. Garrison,et al.  Baseball players diagnosed with ulnar collateral ligament tears demonstrate decreased balance compared to healthy controls. , 2013, The Journal of orthopaedic and sports physical therapy.

[25]  R. Butler,et al.  The reliability of an instrumented device for measuring components of the star excursion balance test. , 2009, North American journal of sports physical therapy : NAJSPT.

[26]  J. Hertel,et al.  Using the Star Excursion Balance Test to assess dynamic postural-control deficits and outcomes in lower extremity injury: a literature and systematic review. , 2012, Journal of athletic training.