Cognitive and Physiological Performance of Soldiers While Carrying Loads Over Various Terrains

Abstract : This study examined the cognitive and physiological performance of soldiers as they carried loads over various terrains. Twelve soldiers each carried a light load (total weight, including clothing, 22.77 kg 50.19 LB) and a heavy load (total weight, including clothing, 36.94 kg 81.43 LB) over three terrains: blacktop road, sand, and mud. The cognitive tasks performed by the soldiers included arithmetical, memory, and monitoring tasks. The physiological variables were oxygen uptake, ventilation rate, heart rate, and rating of perceived exertion. Test participants also rated their overall workload after each trial. The results showed a significant (p = .018) Load x Block interaction for the monitoring task. In Block 2, the error rate for the light load condition was significantly lower than the error rate for the heavy load condition. There were significant main effects of load, terrain, and time for all the physiological variables. in this study, the energy expenditure (oxygen uptake) for walking on mud or loose sand was the same, and it was approximately 40% higher than the energy expenditure for walking on the blacktop road. Subjective ratings of workload showed significant differences as a function of load (p = .006) but not terrain.

[1]  R. F. Goldman,et al.  Predicting energy expenditure with loads while standing or walking very slowly. , 1977, Journal of applied physiology: respiratory, environmental and exercise physiology.

[2]  G. McGlynn,et al.  Effect of Strenuous to Exhaustive Exercise on a Discrimination Task , 1977 .

[3]  James A. Hodgdon,et al.  Derivation of Anthropometry Based Body Fat Equations for the Army's Weight Control Program , 1988 .

[4]  Bruce H Jones,et al.  Army Physical Fitness Test (APFT): Normative Data on 6022 Soldiers , 1993 .

[5]  J. Workman,et al.  Oxygen cost of treadmill walking. , 1963, Journal of applied physiology.

[6]  Y. Zervas.  Effect of a Physical Exercise Session on Verbal, Visuospatial, and Numerical Ability , 1990 .

[7]  R. F. Goldman,et al.  Predicting metabolic energy cost. , 1971, Journal of applied physiology.

[8]  Robert P. Mello,et al.  Relationship Between a Two Mile Run For Time and Maximal Oxygen Uptake , 1988 .

[9]  S ROSS,et al.  Systemic fatigue and perceptual organization. , 1954, The American journal of psychology.

[10]  J. Durnin,et al.  Human energy expenditure. , 1955, Physiological reviews.

[11]  Effect of Physical Exercise on the Performance of Cognitive Tasks , 1993, Perceptual and motor skills.

[12]  M S MALHOTRA,et al.  Influence of body weight on energy expenditure. , 1962, Journal of applied physiology.

[13]  R. F. Goldman.  ENERGY EXPENDITURE OF SOLDIERS PERFORMING COMBAT TYPE ACTIVITIES , 1965 .

[14]  W Riedel,et al.  Cognitive Performance after Strenuous Physical Exercise , 1996, Perceptual and motor skills.

[15]  N. R. Ellis,et al.  Effects of exercise on cognitive processes: A review. , 1986 .

[16]  R. F. Goldman,et al.  Terrain coefficients for energy cost prediction. , 1972, Journal of applied physiology.

[17]  L. Mcnaughton,et al.  Effects of Fatigue on Ability to Process Visual Information by Experienced Orienteers , 1986, Perceptual and motor skills.

[18]  C G Penney,et al.  Modality Effects in Delayed Free Recall and Recognition: Visual is Better than Auditory , 1989, The Quarterly journal of experimental psychology. A, Human experimental psychology.

[19]  Robert A. Walker,et al.  Anthropometric Survey of U.S. Army Personnel: Summary Statistics, Interim Report for 1988 , 1989 .

[20]  J A Gliner,et al.  Visual evoked potentials and signal detection following a marathon race. , 1979, Medicine and science in sports.

[21]  J. E. Cotes,et al.  The energy expenditure and mechanical energy demand in walking. , 1960 .

[22]  C. H. Wyndham,et al.  An equation for prediction of energy expenditure of walking and running. , 1973, Journal of applied physiology.

[23]  C. W. Radcliffe,et al.  Predicting metabolic cost of level walking , 1978, European Journal of Applied Physiology and Occupational Physiology.

[24]  A. C. Bobbert.  Energy expenditure in level and grade walking , 1960 .

[25]  J Knapik,et al.  The Army Physical Fitness Test (APFT): a review of the literature. , 1989, Military medicine.

[26]  K B Pandolf,et al.  Metabolic energy expenditure and terrain coefficients for walking on snow. , 1976, Ergonomics.

[27]  Robert P. Mello,et al.  The Body Composition Project: A Summary Report and Descriptive Data , 1986 .

[28]  R E Schlegel,et al.  Coefficient of Friction and Subjective Assessment of Slippery Work Surfaces , 1992, Human factors.

[29]  G GRIMBY,et al.  Energy expenditure of men in different age groups during level walking and bicycle ergometry. , 1962, Scandinavian journal of clinical and laboratory investigation.

[30]  James M. Miller,et al.  "Slippery" work surfaces: Towards a performance definition and quantitative coefficient of friction criteria , 1983 .

[31]  C P Davey,et al.  Physical exertion and mental performance. , 1973, Ergonomics.

[32]  V P Gupta,et al.  Physical Activity and Efficiency of Mental Work , 1974, Perceptual and motor skills.

[33]  N. R. Ellis,et al.  The immediate effects of strenuous exercise on free-recall memory. , 1987, Ergonomics.

[34]  G. Weingarten.  Mental performance during physical exertion: The benefit of being physically fit. , 1973 .

[35]  J. Hokanson,et al.  EFFECTS OF INCREASED HEART RATE ON INTELLECTUAL PERFORMANCE. , 1964, Journal of abnormal psychology.

[36]  G. Borg,et al.  Perceived exertion: a note on "history" and methods. , 1973, Medicine and science in sports.

[37]  C Bard,et al.  Effects of different types of physical activity on the performance of perceptual tasks in peripheral and central vision and coincident timing. , 1987, Ergonomics.