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Related Experiment Video

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Quantifying warfighter performance in a target acquisition and aiming task using wireless inertial sensors.

Steven P Davidson1, Stephen M Cain1, Ryan S McGinnis2

  • 1College of Engineering, University of Michigan, 2350 Hayward St, Ann Arbor, MI 48109, USA.

Applied Ergonomics
|May 18, 2016
PubMed
Summary

Fatigue significantly impairs warfighter performance in target acquisition tasks. Inertial measurement units (IMUs) effectively quantified reduced turning speed and increased turn time post-exercise.

Keywords:
Aiming performanceFatigueInertial measurement unitsWarfighter performance

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Area of Science:

  • Biomechanics
  • Human Performance
  • Military Science

Background:

  • Fatigue is a critical factor affecting warfighter operational effectiveness.
  • Objective measurement of performance decrements under load and fatigue is essential for military training and equipment development.

Purpose of the Study:

  • To investigate the impact of fatigue on warfighter performance during a target acquisition task.
  • To evaluate the efficacy of inertial measurement units (IMUs) in quantifying changes in movement performance due to fatigue.

Main Methods:

  • Eleven participants performed a fatiguing exercise protocol carrying 20 kg of equipment.
  • Inertial measurement units (IMUs) were attached to the sternum, sacrum, and rifle to record movement data.
  • Participants completed a target acquisition task involving aiming and 180° turns before and after the exercise protocol.

Main Results:

  • Warfighter turning performance significantly decreased after the fatiguing exercise.
  • Peak angular velocity magnitude (PAVM) decreased across sternum, sacrum, and rifle sensors.
  • Turn time (TT) increased significantly for the sternum, sacrum, and rifle during the first turn, and for the rifle during the second turn.

Conclusions:

  • Inertial measurement units (IMUs) provide a reliable method for detecting and quantifying fatigue-induced decrements in warfighter performance.
  • The methodology can be adapted to assess movement performance under various conditions, including load, fatigue, and equipment variations.