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TRUNK LEAN DURING A SINGLE-LEG SQUAT IS ASSOCIATED WITH TRUNK LEAN DURING PITCHING.
Hillary A Plummer1, Gretchen D Oliver2, Christopher M Powers1
1University of Southern California, Los Angeles, CA, USA.
International Journal of Sports Physical Therapy
|February 28, 2018
Summary
Pitchers with excessive trunk lean during a single-leg squat are more likely to exhibit trunk lean during pitching. This finding suggests the single-leg squat can help identify pitchers at risk for upper extremity injuries.
Area of Science:
- Biomechanics
- Sports Medicine
- Orthopedics
Background:
- Impaired trunk motion in baseball pitchers can increase shoulder and elbow injury risk.
- Excessive contralateral trunk lean during pitching is linked to higher upper extremity forces.
- A clinical screening test is needed to identify pitchers with abnormal trunk motion during pitching.
Purpose of the Study:
- To determine the relationship between lateral trunk lean during a single-leg squat (SLS) and trunk lean during pitching.
- To assess if trunk lean during pitching can be predicted from trunk lean during an SLS.
Main Methods:
- A cross-sectional, controlled laboratory study involving 73 young baseball pitchers.
- Trunk kinematics were measured using an electromagnetic tracking system during an SLS and fastball pitching.
- Pearson correlation and linear regression analyses were used to evaluate the relationship between trunk lean during the two tasks.
Main Results:
- A moderate positive correlation (r = 0.53; p<0.001) was found between trunk lean during the SLS and pitching.
- Lateral trunk lean during the SLS significantly predicted trunk lean during pitching (R² = 0.28; p<0.001).
Conclusions:
- Trunk lean during the single-leg squat is moderately correlated with trunk lean during pitching.
- The single-leg squat can explain 28% of the variance in trunk lean during pitching, suggesting its utility as a screening tool.
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