D-28 Free Communication/Poster - Cooling Thursday, May 28, 2015, 1:00 PM - 6:00 PM Room: Exhibit Hall F
BACKGROUND: We examined the physiological responses and exercise performance effects when utilizing the Spruzza, a water misting device, while cycling in the heat.
METHODS: Fourteen (8 male and 6 female, 35.6 ± 7.4 yrs) competitive cyclists completed two randomized trials (with the Spruzza device and without the Spruzza device) separated by a minimum of five days. Cycling trials consisted of two outdoor 10K loops (∼75%VO2max) followed by a 10K time trial (TT). Heart rate (HR), blood lactate, serum glucose, hematocrit, core body temperature, skin temperature (six locations), gastrointestinal symptoms (GI), muscle soreness and fatigue from questionnaires and ratings of perceived exertion (RPE) were recorded after each loop. We also used power tap wheels and Garmin computers to measure average power output, speed, cadence and total distance and time of each loop.
RESULTS: Average temperature (90 ± 4 deg), relative humidity (26 ± 6), barometric pressure (756 ± 2 mmHg) and wind speed (0.6 ± 0.5 m/s) were similar between treatments. Cyclists reported a significant decrease in the rate of fatigue while using the Spruzza device. During the first sub-maximal loop, thirst sensation was less (p=0.001), average thermal stress was less (p=0.04), and ear temperature was lower (p=0.05) with the Spruzza device (90.8 ± 3.5 deg) versus no device (93.8 ± 3.2 deg). There were no significant differences in average power output, speed, time or core temperature during the submaximal loops or with the 10K time trial.
CONCLUSION: While overall fatigue levels were reduced and thirst, thermal stress and ear temperature were reduced during a single 10K loop using the Spruzza misting device while cycling in the heat, there was no affect on performance