Cooling during Exercise in Temperate Conditions: Impact on Performance and Thermoregulation

Abstract

Exercise-induced increase in core body temperature may lead to the development of hyperthermia (>40.0°C) and/or decreased performance levels. This study examined the effects of wearing a cooling vest during a 5-km time trial on thermoregulatory responses and performance. 10 male masters athletes (42±10 years) performed a 5-km time trial on a motorized treadmill in a climate chamber (25°C, 55% relative humidity) with and without a cooling vest. Split times, heart rate, core-, skin- and cooling vest temperature were measured every 500 m. Subjects also rated thermal comfort and level of perceived exertion. The cooling vest significantly decreased heart rate (p<0.05), decreased skin temperature (p<0.001) and improved thermal comfort (p<0.005) during the time trial. Time to finish the 5-km time trial and pacing strategy did not differ between the control (1 246±96 s) and cooling vest condition (1 254±98 s, p=0.85). Additionally, thermoregulatory responses, maximum core body temperature and level of perceived exertion were not different across conditions (p=0.85, p=0.49, p=0.11, respectively). In conclusion, we demonstrated that wearing a cooling vest during exercise improves thermal comfort but does not enhance performance or decrease core body temperature in male masters athletes under temperate ambient conditions.

Key words

cooling vest - core body temperature - endurance exercise - athletes - time trial - precooling

• References

• 1 Armstrong LE, Casa DJ, Millard-Stafford M, Moran DS, Pyne SW, Roberts WO. American College of Sports Medicine position stand. Exertional heat illness during training and competition. Med Sci Sports Exerc 2007; 39: 556-572
• 2 Arngrimsson SA, Petitt DS, Stueck MG, Jorgensen DK, Cureton KJ. Cooling vest worn during active warm-up improves 5-km run performance in the heat. J Appl Physiol 2004; 96: 1867-1874
• 3 Bogerd N, Perret C, Bogerd CP, Rossi RM, Daanen HA. The effect of pre-cooling intensity on cooling efficiency and exercise performance. J Sports Sci 2010; 28: 771-779
• 4 Cheuvront SN, Haymes EM. Thermoregulation and marathon running: biological and environmental influences. Sports Med 2001; 31: 743-762
• 5 Duffield R, Green R, Castle P, Maxwell N. Precooling can prevent the reduction of self-paced exercise intensity in the heat. Med Sci Sports Exerc 2010; 42: 577-584
• 6 Gagge AP, Stolwijk JA, Hardy JD. Comfort and thermal sensations and associated physiological responses at various ambient temperatures. Environ Res 1967; 1: 1-20
• 7 Gant N, Atkinson G, Williams C. The validity and reliability of intestinal temperature during intermittent running. Med Sci Sports Exerc 2006; 38: 1926-1931
• 8 Gonzalez-Alonso J. Human thermoregulation and the cardiovascular system. Exp Physiol 2012; 97: 340-346
• 9 Harriss DJ, Atkinson G. Update 2014 – Ethical standards in sport and exercise science research. Int J Sports Med 2013; 34: 1025-1028
• 10 Hsu AR, Hagobian TA, Jacobs KA, Attallah H, Friedlander AL. Effects of heat removal through the hand on metabolism and performance during cycling exercise in the heat. Can J Appl Physiol 2005; 30: 87-104
• 11 Hunter I, Hopkins JT, Casa DJ. Warming up with an ice vest: core body temperature before and after cross-country racing. J Athl Train 2006; 41: 371-374
• 12 IAAF, Competition Rules 2014–2015 (January 8^th 2014). In Internet http://www.iaaf.org/about-iaaf/documents (January 8^th 2014)
• 13 ISO-9886 ed. Ergonomics – Evaluation of thermal strain by physiological measurements. Second edition ed; 2004
• 14 Johnson E, Sporer B, Sleivert G, Pethick W. The effects of pre-cooling and ambient temperature on 20 km time trial performance in trained cyclists. App Phsiol Nutr Metab 2008; 33: 49-50
• 15 Jones AM, Doust JH. A 1% treadmill grade most accurately reflects the energetic cost of outdoor running. J Sports Sci 1996; 14: 321-327
• 16 Kenefick RW, Cheuvront SN, Sawka MN. Thermoregulatory function during the marathon. Sports Med 2007; 37: 312-315
• 17 Luomala M, Oksa J, Salmi J, Linnamo V, Holmer I, Smolander J, Dugue B. Adding a cooling vest during cycling improves performance in warm and humid conditions. Journal of Thermal Biol 2012; 37: 47-55
• 18 Marino FE. Methods, advantages, and limitations of body cooling for exercise performance. Br J Sports Med 2002; 36: 89-94
• 19 Noble BJ, Borg GA, Jacobs I, Ceci R, Kaiser P. A category-ratio perceived exertion scale: relationship to blood and muscle lactates and heart rate. Med Sci Sports Exerc 1983; 15: 523-528
• 20 Quod MJ, Martin DT, Laursen PB. Cooling athletes before competition in the heat: comparison of techniques and practical considerations. Sports Med 2006; 36: 671-682
• 21 Ross M, Abbiss C, Laursen P, Martin D, Burke L. Precooling methods and their effects on athletic performance: a systematic review and practical applications. Sports Med 2013; 43: 207-225
• 22 Sawka MN. Physiological consequences of hypohydration: exercise performance and thermoregulation. Med Sci Sports Exerc 1992; 24: 657-670
• 23 Sawka MN, Burke LM, Eichner ER, Maughan RJ, Montain SJ, Stachenfeld NS. American College of Sports Medicine position stand. Exercise and fluid replacement. Med Sci Sports Exerc 2007; 39: 377-390
• 24 Sawka MN, Noakes TD. Does dehydration impair exercise performance?. Med Sci Sports Exerc 2007; 39: 1209-1217
• 25 Siegel R, Laursen PB. Keeping your cool: possible mechanisms for enhanced exercise performance in the heat with internal cooling methods. Sports Med 2012; 42: 89-98
• 26 Smith AD, Crabtree DR, Bilzon JL, Walsh NP. The validity of wireless iButtons and thermistors for human skin temperature measurement. Physiol Meas 2010; 31: 95-114
• 27 Stannard AB, Brandenburg JP, Pitney WA, Lukaszuk JM. Effects of wearing a cooling vest during the warm-up on 10-km run performance. J Strength Cond Res 2011; 25: 2018-2024
• 28 Tucker R, Rauch L, Harley YX, Noakes TD. Impaired exercise performance in the heat is associated with an anticipatory reduction in skeletal muscle recruitment. Pflugers Arch 2004; 448: 422-430
• 29 Tyler CJ, Wild P, Sunderland C. Practical neck cooling and time-trial running performance in a hot environment. Eur J Appl Physiol 2010; 110: 1063-1074
• 30 Uckert S, Joch W. Effects of warm-up and precooling on endurance performance in the heat. Br J Sports Med 2007; 41: 380-384
• 31 van Marken Lichtenbelt WD, Daanen HA, Wouters L, Fronczek R, Raymann RJ, Severens NM, Van Someren EJ. Evaluation of wireless determination of skin temperature using iButtons. Physiol Behav 2006; 88: 489-497
• 32 Webster J, Holland EJ, Sleivert G, Laing RM, Niven BE. A light-weight cooling vest enhances performance of athletes in the heat. Ergonomics 2005; 48: 821-837
• 33 Wegmann M, Faude O, Poppendieck W, Hecksteden A, Frohlich M, Meyer T. Pre-cooling and sports performance: a meta-analytical review. Sports Med 2012; 42: 545-564
• 34 Weinert D, Waterhouse J. The circadian rhythm of core temperature: effects of physical activity and aging. Physiol Behav 2007; 90: 246-256
• 35 Wilkinson DM, Carter JM, Richmond VL, Blacker SD, Rayson MP. The effect of cool water ingestion on gastrointestinal pill temperature. Med Sci Sports Exerc 2008; 40: 523-528