Anthropometrics and body composition predict performance during a simulated direct-fire engagement.

Area of Science:

• Military science
• Human performance
• Anthropometry

Background:

• Soldier performance in combat is influenced by physiological factors.
• Understanding anthropometric and body composition impacts is crucial for military readiness.
• Previous research has not fully elucidated these relationships in simulated direct-fire engagements.

Purpose of the Study:

• To determine anthropometric and body composition predictors of performance in a simulated direct-fire engagement.
• To assess the relationship between body metrics and combat effectiveness outcomes like marksmanship, cognitive function, and survivability.
• To identify field-expedient measures for evaluating soldier performance.

Main Methods:

• 33 healthy subjects completed anthropometric and body composition assessments.
• Subjects performed a simulated direct-fire engagement including marksmanship, cognitive workload, and a fire-and-move drill (sprints).
• Statistical analyses (partial correlations, multiple linear regressions) identified predictors of performance outcomes, controlling for age and sex.

Main Results:

• Higher percent body fat, fat mass, and fat load index correlated with increased susceptibility to enemy fire and decreased cognitive performance.
• Higher Body Mass Index (BMI) also predicted lower cognitive performance.
• Shorter stature and hand length were associated with better marksmanship accuracy, while higher fat-free mass predicted slower reaction times.

Conclusions:

• Anthropometric and body composition measures significantly modulate combat effectiveness, influencing both survivability and lethality.
• Findings support the reinforcement of body composition standards within military organizations.
• These metrics can serve as practical indicators of soldier performance in combat scenarios.