Special Weapons and Tactics (SWAT) officers perform a variety of tactical operations while wearing tactical gear. Load carriage has been shown to alter muscle activation in the torso and is also associated with lower back pain, which is a prevalent musculoskeletal injury suffered by SWAT Officers. The purpose of this study was to quantify the effect of tactical gear on muscle activation of torso musculature while performing occupational tasks. Twenty male SWAT Officers (age: 34.7 6 4.5 years; height: 1.79 6 0.1 m; body mass: 91.5 6 17.3 kg) performed 4 tasks (standing, rifle walk, sitting, and shield walk) with and without gear (mass of gear: 13.8 6 1.9 kg). Mean electromyographic amplitude was evaluated bilaterally for the erector spinae, rectus abdominis, and external oblique muscles during the trials and expressed relative to maximal voluntary isometric contraction (MVIC). Addition of gear significantly increased erector spinae mean muscle activation during the rifle walk task (mean delta: +0.16%). However, no differences in muscle activation were identified for any other muscles between gear conditions (effect size#0.15). The shield walk produced the highest mean activation for each muscle during different tasks. The dynamic tasks yielded (0.24-4.18% MVIC) greater muscle activation levels than sitting and standing tasks. Despite minimal increases in muscle activation levels with the addition of gear, load carriage is known to increase the risk of acute and chronic injury. Collectively, these findings indicate that SWAT Officers should perform most skills without gear during tactical training to simulate task-specific movement patterns but reduce the risk of musculoskeletal injury.
|Number of pages||7|
|Journal||Journal of Strength and Conditioning Research|
|State||Published - Jan 1 2022|
Bibliographical noteFunding Information:
The authors would like to extend their gratitude to the subjects of the study and the research assistants Michael Baggaley, Jaclyn Norberg, Ryan Mason, and Nick Trubee for their help in data collection and analysis. This study was not financially supported by any funding mechanism. None of the authors has any potential conflicts of interest to declare with respect to the subject matter of this article. The results of this study do not constitute endorsement of the product by the authors.
© 2022 NSCA National Strength and Conditioning Association. All rights reserved.
- Load carriage
ASJC Scopus subject areas
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation