When athletes operate in a sizzling and humid surroundings (soaked-bulb globe temperature better than 27.seven°C), working general performance may well put up with and the chance of warmth ailment may possibly enhance because of elevated system temperature. 1 From the 2004 Summertime Olympic Game titles in Athens, Greece, a couple of American athletes (distance runners) and all Australian Olympic athletes were being fitted with Nike Ice-Vests (prototype; Nike, Inc, Portland, OR) created to lower body temperature prior to performance. Even though the obtaining was anecdotal as well as vest just one of numerous techniques used by the American runners to reinforce general performance in the warmth, this intervention appeared efficient Among the many marathoners who made use of the vests. Deena Kastor and Meb Keflezighi of the United States, who wore the vests just before competition, the two attained Olympic medals, exceeding many people’s anticipations.Numerous authors 2–7 have investigated the impact of assorted precooling procedures in a laboratory environment. The results of precooling on efficiency and coronary heart charge are already blended, but decreases in body temperature have been continuously uncovered. However, the length of time the cooling outcome lasts is apparently inconsistent. This may be on account of the sort of cooling system used or perhaps to inadequate statistical electricity to detect variances.
Just one team eight evaluated a cooling interval in athletes working a 2-mi (three.22-km) race outdoors after a ninety-minute run in the warmth and documented reduce coronary heart charges once the race, reduce Main entire body temperatures, and improved operating time. Nevertheless, no authors have investigated the application of the ice vest during the prerace regimen and measured its impact on core temperature (Tc) right before, through, and after a race in the field. Our needs had been to determine the Running Vest usefulness of your Nike Ice-Vest in reducing Tc ahead of cross-state racing and also to evaluate no matter if any Tc modifications ended up however existing quickly after the race.Eighteen woman athletes from a National Collegiate Athletic Association Division I cross-place group (age = twenty.0 ± 1.8 yrs, top = 1.68 ± 0.06 m, mass = fifty seven.0 ± 2.three kg) have been analyzed over the 2005 Major Wave Invitational 4-km race in Hawaii (8 athletes, environmental temperature = 27°C, humidity = forty five%) as well as the 2005 Good American 5-km race in North Carolina (10 distinct athletes, environmental temperature = 26°C, humidity = seventy two%).
Topics ended up assigned to the cooling (CL) or control group and assigned a variety primarily based on moments from the preseason time trial, as follows: subject 1 (Management), subject matter 2 (CL), matter 3 (CL), issue four (control), etc. Topics ingested a radiotelemetry temperature sensor (HQ Inc, Palmetto, FL) four several hours before Every single race. One particular hour before the start out with the race, Tc measurements were being taken, and 50 percent the subjects put on a damp Nike Race-Working day Tee in addition to a Nike Ice-Vest ( Determine one). Subjects in the CL team wore the tee and ice vest until 1 minute prior to the commence of the race. Subjects during the Management team wore their standard prerace clothes. No instruction was specified towards the athletes with regard to their unique heat-up routine apart from to stick to their regular program. The Tc measurements ended up taken at ten minutes and one moment prior to the start off on the race. Promptly soon after finishing the race, all topics experienced Tc measurements InstrumentationThe Nike Ice-Vest involves twenty pouches for ice packs. Fully loaded with ice packs, the vest weighs 4.4 kg. The interior layer in the vest is Nike Dri-In shape materials, which offers a layer among the skin and also the ice packs. Adjustable straps permit for a relatively tight in good shape to stop abnormal movement on the vest while the athlete warms up. A wet Race-Day Tee was worn underneath the vest, subsequent Nike’s tips.Statistical AnalysisWe calculated a two-way Evaluation of variance with repeated steps promptly to detect discrepancies in Tc adjustments in between the vest and no-vest groups at ten minutes and 1 moment before the race and quickly afterward. A Tukey submit hoc comparison was utilized to check for variances in Tc amongst groups at Each individual measurement time, with alpha set at .05.