COGNITIVE AND PHYSIOLOGICAL INITIAL RESPONSES DURING COOL WATER IMMERSION
Abstract
The initial responses during water immersion are the first mechanisms reacting to a strong stimulation of superficial nervous cold receptors. Cold shock induces tachycardia, hypertension, tachypnea, hyperventilation, and reduced end-tidal carbon dioxide fraction. These initial responses are observed immediately after the immersion, they last for about 3 min and have been also reported in water temperatures up to 25 °C. the aim of the present study was to observe cognitive and physiological functions during immersion in water at cool temperature. Oxygen consumption, ventilation, respiratory frequency, heart rate and expired fraction of oxygen were measured during the experiment. A code substitution test was used to evaluate executive functions and, specifically, working memory. This cognitive test was repeated consecutively 6 times, for a total duration of 5 minutes. Healthy volunteers (n = 9) performed the test twice in a random order, once in a dry thermoneutral environment and once while immersed head-out in 18 °C water. The results indicated that all the physiological parameters were increased during cool water immersion when compared with the dry thermoneutral condition (p < 0.05). Cognitive performance was reduced during the cool water immersion when compared to the control condition only during the first 2 min (p < 0.05). Our results suggest that planning the best rescue strategy could be partially impaired not only because of panic, but also because of the cold shock.
References
Cheung, S. S. (2002). Cold water immersion. Advanced Environmental Exercise Physiology (pp. 89–99). USA: Human Kinetics.
Datta, A., & Tipton, M. J. (2006). Respiratory responses to cold water immersion: neural pathways, interaction, and clinical consequences awake and asleep. Journal of Applied Physiology, 100, 2057–2064.
Du Bois, D., & Du Bois, E. F. (1916). Clinical calorimetry. A formula to estimate the approximate surface area if height and weight be known. Archives of Internal Medicine, 17, 863–871.
Ducharme, M. B., & Lounsbury, D. S. (2007). Self-rescue swimming in cold water: the latest advice. Applied Physiology Nutrition and Metabolism, 32, 799–807.
Faith, N. (1998). Mayday. London: Macmillian.
Friedman, B. H., & Thayer, J. F. (1998). Autonomic balance revisited: panic anxiety and heart rate variability. Journal of Psychosomatic Research, 44(1), 133–151.
Giesbrecht, G. G., Arnett, J. L., Vela, E., & Bristow, G. K. (1993). Effect of task complexity on mental performance during immersion hypothermia. Aviation Space Environmental Medicine, 64(3 Pt.1), 206–211.
Golden, F. S., & Tipton, M. J. (2002). Cold Water Immersion. Essentials of Sea Survival (pp. 51–141). USA: Human Kinetics.
Hodgdon, J. A., Hesslink, R. L., Hackney, A. C., Vickers, R. R., & Hilbert, R. P. (1991). Norwegian military field exercises in the artic: cognitive and physical performance. Arctic Medical Research, 50 (Suppl 6), 132–136.
Keatinge, W. R., & Nadel, J. A. (1965). Immediate respiratory response to sudden cooling of the skin. Journal of Applied Physiology, 20, 65–69.
Lounsbury, D. S. (2004). Swimming survival – performance and judgement in cold water. MSc thesis. University of Toronto.
Muller, M. D., Gunstad, J., Alosco, M. L., Miller, L. A., Updegraff, J., Spitznagel, M. B., & Glickman, E. L. (2012). Acute cold exposure and cognitive function evidence for sustained impairment. Ergonomics, 55(7), 792–798.
Nocentini, U., Giordano, A., di Vincenzo, S., Panella, M., & Pasqualetti, P. (2006). The Symbol Digit Modalities Test – Oral Version: Italian normative data. Functional Neurology, 21(2), 93–96.
Nykjaer, L. (2009). Mediterranean Sea surface warming 1985–2006. Climate Research, 39, 11–17.
Pepper, R. L., Kennedy, R. S., Bittner, A. C. Jr., Wiker, S. F., & Harbeson, M. M. (1985). Performance evaluation tests for environmental research (PETER): code substitution test. Perceptual and Motor Skills, 61(3 Pt 1), 735–745.
Suhr, J. A., Stewart, J. C., & France, C. R. (2004). The relationship between blood pressure and cognitive performance in the Third National Health and Nutrition Examination Survey (NHANES III). Psychosomatic Medicine, 66(3), 291–297.
Tanaka, H., Monahan, K. D., & Seals, D. R. (2001). Age-Predicted Maximal Heart Rate Revisited. Journal of the American College of Cardiology, 37(1), 153–156.
Thomas, J. R., Ahlers, S. T., House, J. F., & Schrot, J. (1989). Repeated exposure to moderate cold impairs matching-to-sample performance. Aviation Space Environmental Medicine, 60(11), 1063–1067.
Tipton, M. J. (1989). The initial responses to cold-water immersion in man. Clinical Science, 77, 581–588.
Tipton, M. J., Stubbs, D. A., & Elliot, D. H. (1990). The effect of clothing on the initial responses to cold water immersion in man. Journal of the Royal Naval Medical Service, 76(2), 89–95.
Tipton, M. J., Mekjavic, I. B., & Eglin, C. M. (2000). Permanence of the habituation of the initial responses to cold-water immersion in humans. European Journal of Applied Physiology, 83(1), 17–21.
Watanabe, A., Matsuo, K., Kato, N., & Kato, T. (2003). Cerebrovascular response to cognitive tasks and hyperventilation measured by multi-channel near-infrared spectroscopy. Journal Neuropsychiatry Clinical Neuroscience, 15(4), 442–449.
Wright, K. P., Huli, J. T., & Czesler, C. A. (2002). Relationship between alertness, performance and body temperature in humans. American Journal of Physiology Regulatory Integrative Comparative Physiology, 283, R1370–1377.
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