Graduation Term

2014

Degree Name

Master of Science (MS)

Department

School of Kinesiology and Recreation

Committee Chair

Noelle M. Selkow

Abstract

Context: Baseball players are prone to soft tissue and bony adaptations due to repetitive throwing. Humeral retroversion, anterior shoulder laxity, and forward scapular posture are three common adaptations that have been associated with posterior shoulder tightness. Objective: To investigate if relationships exist between humeral retroversion, anterior shoulder laxity, and forward scapular posture among collegiate baseball players. Design: A cross–sectional correlation study. Setting: Athletic training facility at universities. Participants: Forty–eight asymptomatic NCAA Division-I baseball players (age 20.2 ± 1.2, weight 90.39 ± 8.92 kg, height 185.63 ± 6.69 cm). Interventions: Humeral retroversion and anterior shoulder laxity from dominant shoulders and bilateral differences of forward scapular posture were measured twice during the one-time testing session. Main Outcome Measures: Humeral torsion angle and anterior humeral head displacement of dominant shoulder and forward scapular displacement of both shoulders were measured. Results: No significant correlations (p > .385) were found between humeral retroversion, anterior shoulder laxity, and forward scapular posture. Conclusions: While humeral retroversion, anterior shoulder laxity, and forward scapular posture are associated with posterior shoulder tightness, it appears that each variable is a separate entity to the others.

Access Type

Thesis-Open Access

DOI

http://doi.org/10.30707/ETD2014.Mukaihara.Y

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