IJCRR - 6(7), April, 2014
THE EFFECT OF EXERTIONAL HEAT STRESS INDUCED HYPOHYDRATION ON COGNITIVE PERFORMANCE IN HUMAN
Author: Medha Kapoor, Laxmi Prabha Singh, Shuchi Bhagi, Shashi Bala Singh
Aim: Investigations on the effect of hypohydration on cognitive function present with ambiguous and contradictory results. The purpose of this study was to evaluate the effect of exertional heat stress induced hypohydration (Graded hypohydration: 2% and 4%) on cognitive function in Human. Methodology: Six healthy military personnel (age: 25±4 years, height: 172±4cm, weight : 66±3 Kg) performed sub-maximal exercise at 45 ?C and 30% Relative Humidity (RH) in Human Climatic Chamber (HCC) till the desired levels of hypohydration were achieved (2% or 4%). Cognition was assessed using stroop color and word test and PGI battery. Result and Conclusion: Cognitive performance was found to be unaltered upon 2% or 4% hypohydration. The cognitive function was retained under hypohydration demonstrating cognitive resilience in response to moderate body fluid deficits (up to 4%).
Keywords: Exertional heat stress, hypohydration, stroop color and word test, PGI battery test, cognition
Medha Kapoor, Laxmi Prabha Singh, Shuchi Bhagi, Shashi Bala Singh. THE EFFECT OF EXERTIONAL HEAT STRESS INDUCED HYPOHYDRATION ON COGNITIVE PERFORMANCE IN HUMAN International Journal of Current Research and Review. 6(7), April, 46-51
1. Singh LP, Kapoor M, Singh SB. Heat: not black, not white. It's gray!!! J Basic Clin Physiol Pharmacol. 2013;24(4):209-24.
2. Lieberman HR. Hydration and cognition: a critical review and recommendations for future research. J Am Coll Nutr. 2007 Oct;26(5 Suppl):555S-561S.
3. Ganio MS, Armstrong LE, Casa DJ, McDermott BP, Lee EC, Yamamoto LM, Marzano S, Lopez RM, Jimenez L, Le Bellego L, Chevillotte E, Lieberman HR. Mild dehydration impairs cognitive performance and mood of men. Br J Nutr. 2011 Nov;106(10):1535-43.
4. Cheuvront SN, Carter R 3rd, Sawka MN. Fluid balance and endurance exercise performance. Curr Sports Med Rep. 2003 Aug;2(4):202-8.
5. Sawka MN. Physiological consequences of hypohydration: exercise performance and thermoregulation. Med Sci Sports Exerc. 1992 Jun;24(6):657-70.
6. Evaluation of physical performance on the basis of test. In: Åstrand PO, Rodahl K., editors. Textbook of Work Physiology: Physiological basis of exercise. 4 th ed. USA: McGraw-Hill; 2003. p. 280-290.
7. Golden, C. J. (1976), Identification of brain disorders by the stroop color and word test. J. Clin. Psychol.,32: 654– 658.doi: 10.1002/1097- 4679(197607)32:33.0.CO;2-Z
8. Pershad D, Verma SK. Handbook of PGI Battery of Brain Dysfunction (PGIBBD) Agra: National Psychological Corporation; 1990.
9. Pershad D, Wig NN. The Construction and Standardization of a Clinical Test of Memory in Simple Hindi. National Psychological Corporation, Agra, 1977.
10. Montain SJ, Coyle EF. Influence of graded dehydration on hyperthermia and cardiovascular drift during exercise. J Appl Physiol (1985). 1992 Oct;73(4):1340-50.
11. Ramanathan NL. A new weighting system for mean surface temperature of the human body. J Appl Physiol. 1964 May;19:531-3.
12. Adam GE, Carter R 3rd, Cheuvront SN, Merullo DJ, Castellani JW, Lieberman HR et al. Hydration effects on cognitive performance during military tasks in temperate and cold environments. Physiol Behav. 2008 Mar 18;93(4-5):748-56.
13. Patel AV, Mihalik JP, Notebaert AJ, Guskiewicz KM, Prentice WE. Neuropsychological performance, postural stability, and symptoms after dehydration. J Athl Train. 2007 Jan-Mar;42(1):66-75.
14. Szinnai G, Schachinger H, Arnaud MJ, Linder L, Keller U. Effect of water deprivation on cognitive-motor performance in healthy men and women. Am J Physiol Regul Integr Comp Physiol. 2005 Jul;289(1):R275-80.