Summary
In a military field artillery trial, the effects of 8 days of sustained manual work and partial sleep loss on isometric right hand grip strength and upper and lower body anaerobic power (using the Wingate test) was investigated in 25 healthy young male soldiers. During the trial, the physical activity of each subject was essentially identical except that an experimental group (n=18) manually handled a large quantity of artillery shells (weighing 45 kg) and charges (13 kg), whilst a control group (n=7) merely simulated manual handling activities and did no lifting or loading of shells. The daily amount of sleep obtained by each group was similar (3 to 4 hours), as were their activity patterns and food and fluid intake. Isometric right hand grip strength for both groups fell progressively during the trial and did not return to pre-trial levels during 3 days of recovery. At the end of the 8 day trial, there were statistically significant reductions in the body weight (1.9%,p< 0.001), % body fat (7.1%,p< 0.001) and upper body mean power (7.3%,p<0.01) of the experimental group but not in the controls. Lower body peak and mean power were significantly increased at the end of the trial in both the experimental (14.7%,p<0.001 and 17.0%,p<0.001 respectively) and control (14.3%,p<0.01 and 15.0%,p<0.05 respectively) groups. Lower body power decrease was significantly increased (18.1%,p<0.05) in the experimental group but not in the controls. It is suggested that the increase in lower body anaerobic power may be associated with the increased level of physical activity during the trial ie a training effect, and that the decrease in upper body anaerobic power may be associated with the combination of unaccostomed arduous manual handling of heavy loads and partial sleep loss since it was only observed in the experimental group.
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References
Astrand PO, Rodahl K (1977) Textbook of work physiology. McGraw Hill, London
Bar-Or O (1978) A new anaerobic capacity test — characteristics and applications. 21st World Congress in Sports Medicine, Brasilia September 7–12
Durnin JVGA, Womersley J (1974) Body fat assessed from total body density and its estimate from skinfold thickness: measurements on 481 men and women aged 16–72 years. Br J Nutr 32:77–97
Haslam DR (1981) The military performance of soldiers in continuous operations: Exercises Early Call I and II. In: Johnson LC, Tepas DI, Colguhoun WP, Colligan (eds) Advances in sleep Research, vol. 7. Spectrum Press, New York, pp 435–458
Inbar O, Ayalon A, Bar-Or O (1974) Relationship between tests of anaerobic capacity and power. Israel J Med Sci 10:290
Legg SJ, Pateman CM (1984) A physiological study of the repetitive lifting capabilities of healthy young males. Ergonomics 27:259–272
Martin BJ, Gaddis GM (1981) Exercise after sleep deprivation. Med Sci Sports Exerc 13:220–223
McMurray RG, Brown CF (1984) The effect of sleep loss on high intensity exercise and recovery. Aviat Space Environ Med 55:1031–1035
Murphy MM, Knapik JJ, Vogel JA (1984) Relationship of anaerobic power capacity to performance during a 5-day sustained combat scenario. US Army Res Inst of Environmental Med Techn Rep T5/84
Myles WS, Eclache JP, Beaury J (1979) Self-pacing during sustained, repetitive exercise. Aviat Space Environ Med 50:921–924
NIOSH Technical Report No 81–122 (1981) Works Practices Guide for Manual Work. US Department of Health and Human Services, Centres for Disease Control, National Institute for Occupational Safety and Health, Division of Biomedical and Behavioral Science, Cincinnati, Ohio
Patton JF, Duggan A (1985) The evaluation of tests of anaerobic power. APRE Memorandum 85M503. Army Personnel Research Establishment, Farnborough, Hants, GB
Patton JF, Murphy MM, Frederick FA (1985) Maximal power output during the Wingate anaerobic test. Int J Sports Med 6:82–85
Shephard RJ (1978) Human Physiological Work Capacity. Cambridge University Press, Cambridge
Siri WE (1961) Body composition from fluid spaces and density: analysis of methods. In: Brozek J, Henschel A (eds) Techniques for measuring body composition. Nat Acad of Sci, Washington, DC
Straub WF (1979) Grip strength of college and professional football players. Ergonomics 22:1185–1194
Taylor HL, Buskirk E, Henchel A (1955) Maximal oxygen intake as an objective measure of cardio-respiratory performance. J Appl Physiol 8:73–80
Wright JE, Vogel JA, Sampson JB, Knapik JJ, Patton JF, Daniels WL (1983) Effects of travel across time zones (jet-lag) on exercise capacity and performance. Aviat Space Environ Med 54:132–137
Young K, Davies CTM (1984) Effect of diet on human muscle weakness following prolonged exercise. Eur J Appl Physiol 53:84–85
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Legg, S.J., Patton, J.F. Effects of sustained manual work and partial sleep deprivation on muscular strength and endurance. Europ. J. Appl. Physiol. 56, 64–68 (1987). https://doi.org/10.1007/BF00696378
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DOI: https://doi.org/10.1007/BF00696378