Physical performance responses during 72 h of military operational stress
| Autor: | John F. Patton, Cara D. Leone, John W. Castellani, Bradley C. Nindl, William J. Tharion, Scott J. Montain, Richard F. Johnson |
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| Rok vydání: | 2002 |
| Předmět: |
Adult
Male Physical Exertion Physical Therapy Sports Therapy and Rehabilitation Body weight Risk Assessment Sampling Studies Professional activity Aeronautics Reference Values Stress Physiological Task Performance and Analysis Humans Orthopedics and Sports Medicine Occupations Probability Analysis of Variance Body Weight Adaptation Physiological Nutrient starvation Military personnel Military Personnel Physical performance Reference values Body Composition Physical Endurance Psychology |
| Zdroj: | Medicine & Science in Sports & Exercise. 34:1814-1822 |
| ISSN: | 0195-9131 |
| DOI: | 10.1097/00005768-200211000-00019 |
| Popis: | To characterize the impact of prolonged work, underfeeding, and sleep deprivation (i.e., sustained operations; SUSOPS) on physical and occupational related performance during military operational stress.Ten male soldiers were tested on days 1 (D1), 3 (D3), and 4 (D4) of a control and an experimental week that included prolonged physical work (total daily energy expenditure approximately 4,500 kcal x d(-1)), underfeeding (approximately 1,600 kcal x d(-1)), and sleep deprivation (approximately 2 h x d(-1)). Body composition was measured with dual-energy x-ray absorptiometry (DEXA). Ballistic power was assessed by 30 repetitive squat jumps and bench-press throws. Military-relevant occupational performance was evaluated with a 10-min box lift, obstacle course, grenade throw, rifle marksmanship, and a 25-min wall-build task.Fat-free mass (-2.3%) and fat mass (-7.3%) declined (P/= 0.05) during SUSOPS. Squat-jump mean power (-9%) and total work (-15%) declined (P/= 0.05) during SUSOPS. Bench-press power output, grenade throw, and marksmanship for pop-up targets were not affected. Obstacle course and box-lift performances were lower (P/= 0.05) on D3 but showed some recovery on D4. Wall building was approximately 25% lower (P/= 0.05) during SUSOPS.Decrements in performance during SUSOPS are primarily restricted to tasks that recruit muscles that are over-utilized without adequate recovery. General military skill tasks and occupational physical performance tasks are fairly well maintained. |
| Databáze: | OpenAIRE |
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