Performance changes during repeated military occupational test and its associations to physical performance

Area of Science:

• Military Science
• Exercise Physiology
• Human Performance

Background:

• Soldiers frequently perform physically demanding tasks repeatedly with limited recovery.
• Understanding the relationship between physical performance and task execution under fatigue is crucial for military readiness.

Purpose of the Study:

• To investigate performance changes during repeated military simulation task tests (RMST).
• To identify associations between physical performance variables and RMST performance across multiple runs.
• To determine how physical demands shift under acute fatigue during high-intensity tasks.

Main Methods:

• 114 male soldiers completed multiple runs of the RMST with short recovery periods.
• Physical performance was assessed through measurements of lower body explosive force, anaerobic endurance, upper body strength endurance, and aerobic endurance (3.2km loaded run).
• Statistical analyses were used to determine the variance explained by physical performance variables in RMST performance.

Main Results:

• Lower body explosive force, anaerobic endurance, and upper body strength endurance significantly predicted performance in the first RMST run (explaining 58% of variance).
• In subsequent runs, aerobic endurance replaced explosive force as a key predictor, alongside anaerobic and strength endurance (explaining 60% and 51% of variance).
• This indicates a decreased reliance on explosive power and an increased importance of aerobic endurance as fatigue accumulates.

Conclusions:

• The study demonstrates a shift in critical physical performance attributes during repeated high-intensity military tasks.
• Lower body explosive power is vital initially, but military-specific aerobic endurance becomes more important as fatigue develops.
• Findings can inform tactical strength and conditioning programs to optimize soldier occupational performance.