Shoulder Strength in Baseball Players

NCT07209423 | Not Yet Recruiting

• 1 other identifier: 5250475
• Study Type: observational
• Target: 120
• Locations: 0 countries
• Sites: N/A

Brief Summary

The purpose of this graduate student research study is to transform the existing concepts surrounding shoulder strength in baseball players, particularly in the context of retroverted shoulders.

Conditions

Healthy Subjects

Keywords

baseball; shoulder

Outcome Measures

Primary Outcomes (1)

• Strength

  Shoulder external rotation and internal rotation strength will be measured with a dynamometer at the end range, as well as at retroverted shoulder neutral and zero degrees for three times. Grip strength will also be measured three times using the dynamometer after the shoulder strength assessments.

  baseline reading on visit one

Study Arms (2)

Baseball players in the United States

Other: Strength and Range of Motion

Baseball players in Japan

Other: Strength and Range of Motion

Interventions

Strength and Range of Motion OTHER

Shoulder external rotation and internal rotation strength will be measured with a dynamometer at the end range, as well as at retroverted shoulder neutral and zero degrees for three times. Grip strength will also be measured three times using the dynamometer after the shoulder strength assessments.

Baseball players in Japan; Baseball players in the United States

Eligibility Criteria

• Age: 15 Years - 22 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

Baseball players from schools in the United States and Japan.

You may qualify if:

• Able to participate in baseball activities
• All races and ethnicities.
• Speaks and understands English or Japanese.

You may not qualify if:

• A diagnosis of a current injury that prevents participation in baseball activities.
• Orthopedic conditions (e.g., muscle strain, ligament sprain)
• Vascular history (e.g., blood clots, vascular surgery, varicose veins)
• Neurological history (e.g., stroke, nerve injury, or cognitive impairment)
• Cardiopulmonary conditions (e.g., hypertension, heart disease)
• Any history of bleeding or clotting disorders
• Diabetes, cancer, rhabdomyolysis, or compartment syndrome
• Additionally, not maintaining participant's regular diet on the day of the research will also impact eligibility.

Sponsors & Collaborators

• Loma Linda University: lead

MeSH Terms

Interventions

Range of Motion, Articular

Intervention Hierarchy (Ancestors)

Physical Examination; Diagnostic Techniques and Procedures; Diagnosis; Musculoskeletal Physiological Phenomena; Musculoskeletal and Neural Physiological Phenomena

Study Officials

• Everett Lohman, DSc

  Loma Linda University

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Everett Lohman, DSc

CONTACT

909) 558-1000 Ext. 83171; elohman@llu.edu

Study Design

• Study Type: observational
• Observational Model: OTHER
• Time Perspective: OTHER
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: October 1, 2025
• First Posted: October 7, 2025
• Study Start: April 1, 2026
• Primary Completion (Estimated): November 20, 2026
• Study Completion (Estimated): November 20, 2026
• Last Updated: February 4, 2026

Record last verified: 2026-02

Data Sharing

• IPD Sharing: Will not share