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

Abstract:

UNLABELLED:U.S. Marines perform mission tasks under heavy loads which may compromise performance of combat tasks. However, data supporting this performance decrement are limited. PURPOSE:The aim of this study was to determine the effects of load on performance of combat-related tasks. METHODS: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. RESULTS: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. CONCLUSION: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.

journal_name

Mil Med

journal_title

Military medicine

authors

Jaworski RL,Jensen A,Niederberger B,Congalton R,Kelly KR

doi

10.7205/MILMED-D-14-00432

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

179-86

issue

3 Suppl

eissn

0026-4075

issn

1930-613X

journal_volume

180

pub_type

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