Influence of Wearing Ballistic Vests on Physical Performance of Danish Police Officers: A Cross-Over Study

Abstract

Purpose: We aimed to investigate the influence of wearing a ballistic vest on physical performance in police officers. Methods: We performed a cross-over study to investigate the influence of wearing a ballistic vest on reaction and response time, lumbar muscle endurance and police vehicle entry and exit times. Reaction and response time was based on a perturbation setup where the officers’ pelvises were fixed and EMG of lumbar and abdominal muscles was recorded. We used a modified Biering–Sørensen test to assess the lumbar muscle endurance and measured duration of entry and exit maneuvers in a variety of standard-issue police cars. Results: There was a significant difference of 24% in the lumbar muscle endurance test (no vest: 151 s vs. vest: 117 s), and the police officers experienced higher physical fatigue after the test when wearing a vest. Furthermore, officers took longer to both enter and exit police cars when wearing a vest (range: 0.24–0.56 s) depending on the model of the vehicle. There were no significant differences in reaction and response times between the test conditions (with/without vest). Discussion and Conclusion: Wearing of a ballistic vest significantly influenced the speed of movement in entry and exit of police cars and lumbar muscle endurance, although it does not seem to affect reaction or response times. The ballistic vest seems to impair performance of tasks that require maximal effort, which calls for better designs of such vests.

Posturální stabilita stoje členů IZS využívajících balistické vesty

“…Zjistili, že nošení balistické vesty signifikantně ovlivňuje pohyb a výdrž svalů, zhoršuje výkon při plnění úkolů, které vyžadují úsilí. Nositelé také subjektivně upozorňují na sníženou mobilitu, což způsobuje diskomfort při nošení této ochranné pomůcky [9]. V několika studiích, zabývajících se zdravotními obtížemi členů IZS spojenými s dlouhodobým nošením ochranných pomůcek se prokázala souvislost, mezi nošením pomůcek muskuloskeletální bolestí.…”

Analysis of Musculoskeletal Biomechanics of Lower Limbs of Drivers in Pedal-Operation States

“…EMG max represents the electrical signal generated by the muscle when it is in the maximum state of force, and we used MVC action calibration to obtain the parameter. The calculation process of muscle activation is shown in Figure 6 [30,31]. When muscle activation is low, it means that the muscles are more relaxed, and the comfort level is higher [27].…”