Tags

Type your tag names separated by a space and hit enter

Physical performance responses during 72 h of military operational stress.
Med Sci Sports Exerc 2002; 34(11):1814-22MS

Abstract

PURPOSE

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.

METHODS

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.

RESULTS

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.

CONCLUSION

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.

Authors+Show Affiliations

Military Performance Division, U.S. Army Research Institute of Environmental Medicine, Natick, MA 01760, USA. bradley.nindl@na.amedd.army.milNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article

Language

eng

PubMed ID

12439088

Citation

Nindl, Bradley C., et al. "Physical Performance Responses During 72 H of Military Operational Stress." Medicine and Science in Sports and Exercise, vol. 34, no. 11, 2002, pp. 1814-22.
Nindl BC, Leone CD, Tharion WJ, et al. Physical performance responses during 72 h of military operational stress. Med Sci Sports Exerc. 2002;34(11):1814-22.
Nindl, B. C., Leone, C. D., Tharion, W. J., Johnson, R. F., Castellani, J. W., Patton, J. F., & Montain, S. J. (2002). Physical performance responses during 72 h of military operational stress. Medicine and Science in Sports and Exercise, 34(11), pp. 1814-22.
Nindl BC, et al. Physical Performance Responses During 72 H of Military Operational Stress. Med Sci Sports Exerc. 2002;34(11):1814-22. PubMed PMID: 12439088.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Physical performance responses during 72 h of military operational stress. AU - Nindl,Bradley C, AU - Leone,Cara D, AU - Tharion,William J, AU - Johnson,Richard F, AU - Castellani,John W, AU - Patton,John F, AU - Montain,Scott J, PY - 2002/11/20/pubmed PY - 2003/3/7/medline PY - 2002/11/20/entrez SP - 1814 EP - 22 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 34 IS - 11 N2 - PURPOSE: 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. METHODS: 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. RESULTS: 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. CONCLUSION: 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. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/12439088/Physical_performance_responses_during_72_h_of_military_operational_stress_ L2 - http://Insights.ovid.com/pubmed?pmid=12439088 DB - PRIME DP - Unbound Medicine ER -