Changes in combat task performance under increasing loads in active duty marines

Military Medicine
Rebecca L JaworskiKaren R Kelly

Abstract

U.S. Marines perform mission tasks under heavy loads which may compromise performance of combat tasks. However, data supporting this performance decrement are limited. The aim of this study was to determine the effects of load on performance of combat-related tasks. Subjects (N=18) ran a modified Maneuver Under Fire ([MANUF], 300 yards [yd] total: two 25-yd sprints, 25-yd crawl, 75-yd casualty drag, 150-yd ammunition can carry, and grenade toss) portion of the U.S. Marine Corps Combat Fitness Test under 4 trial conditions: neat (no load), 15%, 30%, and 45% of body weight, with a shooting task pre- and post-trial. There was a significant increase in total time to completion as a function of load (p<0.0001) with a relationship between load and time (r=0.592, p<0.0001). Pre- to post-MANUF shot accuracy (p=0.005) and precision (p<0.0001) was reduced. Short aerobic performance is significantly impacted by increasing loads. Marksmanship is compromised as a function of fatigue and load. These data suggest that loads of 45% body weight increase time to cover distance and reduce the ability to precisely hit a target.

Citations

Mar 23, 2019·Military Medicine·Andrew E JensenKaren R Kelly
Jan 11, 2018·International Journal of Environmental Research and Public Health·Aaron JosephJ Jay Dawes
May 5, 2018·International Journal of Environmental Research and Public Health·Ben SchramGeoff Norris
Nov 26, 2015·Journal of Strength and Conditioning Research·Karen R Kelly, Jason T Jameson
Jul 26, 2018·European Journal of Sport Science·J J Gil-CosanoJ Heredia-Jimenez
May 27, 2017·Journal of Strength and Conditioning Research·Kai PihlainenHeikki Kyröläinen
Mar 11, 2020·International Journal of Environmental Research and Public Health·Kai PihlainenHeikki Kyröläinen
Sep 25, 2019·International Journal of Environmental Research and Public Health·Rhiannon ThomasRobin Orr
Jul 8, 2021·European Journal of Sport Science·Gregory S Walsh, Isabel Harrison

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