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Isometric Strength Adaptations After Two Consecutive 12-week Strength and Conditioning Programs in U.S. Air Force

Alexandra P Brojanac¹, Hunter Haynes², Jacob Mota¹

¹Department of Kinesiology and Sports Management, College of Arts and Sciences, Texas Tech University, Lubbock, Texas.

Journal of Strength and Conditioning Research

|June 1, 2026

Summary

Structured strength and conditioning programs improved isometric strength in Air Force Reserve Officer Training Corps cadets. However, initial gains in force production were not sustained when adjusted for baseline lean soft tissue, suggesting preconditioning is key.

Keywords:

U.S. Air Force fitness assessment athletic shoulder test interlimb asymmetry isometric mid-thigh pull military rate of force development

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Area of Science:

Exercise Physiology
Sports Science
Military Fitness

Background:

Formal strength and conditioning programs are crucial for developing tactical athletes.
Assessing isometric strength adaptations provides insights into training effectiveness.
Understanding the influence of body composition on strength gains is essential for optimizing performance.

Purpose of the Study:

To evaluate isometric strength changes in U.S. Air Force Reserve Officer Training Corps (ROT C) cadets following two distinct 12-week training programs.
To assess the impact of the Supporting Tactical Athlete Readiness (STAR) Program on upper and lower body force production.
To investigate the relationship between baseline body composition and strength adaptations.

Main Methods:

Two cohorts of cadets (N=42 fall, N=39 spring) underwent unique 12-week strength and conditioning interventions.
Lower body strength was assessed using isometric mid-thigh pull tests.
Upper body strength was evaluated using athletic shoulder tests, with physical fitness and body composition (DXA) measured throughout.

Main Results:

Following the fall program, cadets showed increased peak force and leg muscle quality, but decreased rate of force development.
Improvements in the fall were not significant after adjusting for baseline lean soft tissue, which correlated positively with force production changes.
The spring program led to increased shoulder muscle quality, average force, and peak force, with decreased asymmetry, though these were also attenuated after lean soft tissue adjustment.

Conclusions:

Structured training can enhance isometric strength in cadets, but initial improvements may depend on muscular preconditioning.
Field-friendly isometric assessments can aid in monitoring cadet progress and potentially reduce injury risk.
Long-term tactical performance may be supported by incorporating these training and assessment strategies.