title: Quantifying warfighter performance in a target acquisition and aiming task using wireless inertial sensors.
abstract: An array of inertial measurement units (IMUS) was experimentally employed to analyze warfighter performance on a target acquisition task pre/post fatigue. Eleven participants (5M/6F) repeated an exercise circuit carrying 20 kg of equipment until fatigued. IMUs secured to the sacrum, sternum, and a rifle quantified peak angular velocity magnitude (PAVM) and turn time (TT) on a target acquisition task (three aiming events with two 180° turns) within the exercise circuit. Turning performance of two turns was evaluated pre/post fatigue. Turning performance decreased with fatigue. PAVMs decreased during both turns for the sternum (p < 0.001), sacrum (p = 0.007) and rifle (p = 0.002). TT increased for the sternum (p = 0.001), sacrum (p = 0.003), and rifle (p = 0.02) during turn 1, and for the rifle (p = 0.04) during turn 2. IMUs detected and quantified changes in warfighter aiming performance after fatigue. Similar methodologies can be applied to many movement tasks, including quantifying movement performance for load, fatigue, and equipment conditions.
authors.affiliation: College of Engineering, University of Michigan, 2350 Hayward St, Ann Arbor, MI 48109, USA. Electronic address: stevepd@umich.edu.
authors.forename: Steven P
authors.initials: SP
authors.lastname: Davidson
authors.affiliation: College of Engineering, University of Michigan, 2350 Hayward St, Ann Arbor, MI 48109, USA.
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Cain
authors.affiliation: MC10 Inc., 9 Camp Street, Cambridge, MA 02140, USA.
authors.forename: Ryan S
authors.initials: RS
authors.lastname: McGinnis
authors.affiliation: College of Engineering, University of Michigan, 2350 Hayward St, Ann Arbor, MI 48109, USA.
authors.forename: Rachel R
authors.initials: RR
authors.lastname: Vitali
authors.affiliation: College of Engineering, University of Michigan, 2350 Hayward St, Ann Arbor, MI 48109, USA.
authors.forename: Noel C
authors.initials: NC
authors.lastname: Perkins
authors.affiliation: School of Kinesiology, University of Michigan, 401 Washtenaw Avenue, Ann Arbor, MI 48109, USA.
authors.forename: Scott G
authors.initials: SG
authors.lastname: McLean
mesh_terms: D000293:Adolescent; D001696:Biomechanical Phenomena; D005221:Fatigue / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008889:Military Personnel; D009048:Motor Skills / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D012447:Sacrum; D013249:Sternum; D013647:Task Performance and Analysis; D054041:Weapons; D059015:Wireless Technology; D055815:Young Adult
keywords: Aiming performance; Fatigue; Inertial measurement units; Warfighter performance