Date of Award

5-2024

Degree Type

Thesis

Degree Name

Master of Science

Department

Health and Human Performance

Program

Exercise Science (MS)

First Advisor/Chairperson

Dr. Matthew Kilgas

Abstract

Overhead athletes may be at an increased risk for shoulder injury if fatiguing exercise results in reduced shoulder dynamic stability. The purpose of this study was to determine the effect of upper body fatiguing exercise on shoulder dynamic stability of overhead athletes and non-overhead athletes. We measured dynamic stability of the shoulder in n = 16 participants (Non-Overhead: n = 10, 24.3 ± 4.67 years; Overhead: n = 6, 22.67 ± 1.75 years) using the Upper Quarter Y-Balance Test (UQYBT) followed by completion of an upper body exercise protocol. Dynamic stability was re-assessed at 1-, 5-, and 10-minutes following completion of the exercise protocol. A mixed effects model was used to determine the effects of group, time, and the interaction of group and time on dynamic stability. Group and time were designated as fixed effects with random effects in participants. Alpha was set at 0.05 for all analyses. Reach distance was reduced for all participants at 1-minute post-exercise compared to baseline scores for composite (57.97 ± 15.89% AL, p < 0.001) and superolateral reach (78.63 ± 12.81% AL, p < 0.01). Inferolateral reach was significantly reduced in non-overhead athletes but not overhead athletes (p < 0.01). The results indicate the ability to dynamically stabilize the shoulder is reduced after fatiguing exercise. However, the reduction appears to be transient and recovers in a short period of time (p > 0.05). Due to training effects, overhead athletes may also have increased protection against the effects of exercise on shoulder dynamic stability.

Access Type

NMU Users Only

Additional Files
Appendix D_Photo Release.pdf (385 kB)
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