Effects of Continuous Military Operations on Physical Fitness Capacity and Physical Performance

摘要

The purposes of this study were to determine the effects of a continuous field artillery scenario on physical fitness capacity and performance and to estimate the physical intensity of the scenario by continuous heart rate monitoring. Twenty-four artillerymen comprising three, 8-man guncrews participated in an 8-day, combat-simulated operation. Body composition and measures of fitness (isokinetic strength of the arms and legs, isometric handgrip strength, dynamic lifting, and upper body anaerobic power) were determined before and immediately following the scenario. No changes occurred in body weight or upper body anaerobic power from pre to post- scenario. However, measures of muscular strength and lifting capacity increased by 12-18% post-scenario. Physical performance scores were significantly higher on days 1 and 8 compared to the other days but no differences were seen from days 2 through 7. The results suggest that soldiers who are allowed 5 hrs sleep per day and who are required to perform at relatively moderate levels of physical intensity show no decrements in physical fitness capacity or evidence of physical fatigue for up to 8 days of continuous operations.