A job task analysis of the physical demands of manually preparing a 4-person battle trench as a military defensive position
本研究通过工作任务分析量化了英军地面近战人员准备防御阵地时的体力需求，发现挖掘是核心任务，耗氧量随工作速率显著变化，可为选拔、训练和技术改进提供依据。
Conduct a Job Task Analysis (JTA) to quantify the physical demands of preparing a defensive position by British Army Ground Close Combat (GCC) roles. Subjective data to describe the demands of preparing a defensive position were gathered from focus groups (n = 90) and questionnaires (n = 1495). Eight GCC personnel were observed preparing a defensive position which involved digging, lifting, and carrying materials. The oxygen cost of digging was measured using staged reconstructions at slow (12 shovels min −1 , n = 16) and fast (22 shovels min −1 , n = 13) rates. The JTA identified digging trenches, filling sandbags, and shovelling debris as principal tasks of preparing a defensive position. Oxygen cost during the fast -digging rate (27.45 ± 4.93 ml kg −1 min −1 ) was 26 % greater than the slow er rate (21.75 ± 2.83 ml kg −1 min −1 ; p < 0.001, d = −1.461). Digging a defensive position was identified by military experts as a critical job-task, with variability in metabolic cost dependent on work rate. Data may inform selection, training, and technology interventions to improve task performance.