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Energy Drink Consumption and Running...

Reed, Emma Lamont.

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Energy Drink Consumption and Running Performance in a Hot Environment.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Energy Drink Consumption and Running Performance in a Hot Environment./
Author:	Reed, Emma Lamont.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	76 p.
Notes:	Source: Masters Abstracts International, Volume: 58-02.
Contained By:	Masters Abstracts International58-02(E).
Subject:	Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10930644
ISBN:	9780438456426

Energy Drink Consumption and Running Performance in a Hot Environment.
Reed, Emma Lamont.

Energy Drink Consumption and Running Performance in a Hot Environment. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 76 p.

Source: Masters Abstracts International, Volume: 58-02.

Thesis (M.S.)--State University of New York at Buffalo, 2018.

Energy drinks have been reported to have an ergogenic effect on exercise performance but there are few objective reports on the interaction of energy drinks and exercise in the heat. The purpose of this investigation was to test the hypothesis that energy drink consumption prior to a 5-km time trial improves performance and alters thermoregulation in a hot environment. Methods: Sixteen experienced runners (9 males, age 22 +/- 3 years, VO2max: 52.7 +/- 7.2 ml/kg/min) completed two 5-km time trials in a double-blind, randomized, crossover design. Forty-five minutes after consuming 500 mL of a commercially available energy drink (ED; &sim;230 mg caffeine) or non-caloric taste-matched placebo (PL), subjects completed a steady state walk (30 minutes; 3 mph with a grade adjusted to achieve 50% of maximal heart rate) followed by the time trial. Experimental visits were completed on a treadmill in an environmental chamber set to 34°C and 40%RH. Subjects were instructed to run the 5-km in the least time possible but blinded to time and speed. Comparisons between beverages included heart rate (HR), core (Tc) and skin (Tsk) temperature, perceptions (RPE, thermal comfort and sensation, sweating), blood pressure (MAP), sweat rate, and time to completion. Results: During the steady state exercise, there was no difference in HR (Delta ED 32 +/- 14 vs. PL 32 +/- 12 bpm; p= 0.72), Tc (Delta ED 0.55 +/- 0.15 vs. PL 0.58 +/-0.24ºC; p= 0.779) or Tsk (Delta ED 2.6 +/- 0.7 vs. 2.4 +/- 0.7ºC; p= 0.768) between beverages. However, MAP was significantly higher with the ED at the end of steady-state exercise (ED 80 +/- 6.5 vs. PL 77 +/- 4 mmHg, p = 0.004). Sweat rate was lower with the ED (0.4 +/- 0.2 vs PL 0.6 +/- 0.4 L&dot;hr-1; p < 0.001). For the time trial, mean 5-km time to completion was not different between beverages (ED 1399 +/- 216 vs PL 1410 +/- 212 seconds; p= 0.476). HR was higher with the ED during the 5-km run (p = 0.03), but T c (p= 0.611), Tsk (p= 0.464) or RPE (p= 0.734) did not differ between beverages. Sweat rate was higher with the ED (1.4 +/- 0.5 vs 1.1 +/- 0.3 L&dot;hr-1; p = 0.05). However, total change in body mass, urine osmolality, and USG did not differ between beverages across the visits. Conclusions: Consuming an energy drink before running a 5-km in the heat did not improve running performance among young healthy runners. There was a minimal effect on thermoregulation and cardiovascular responses during both steady state and time trial exercise. Heat stress likely masks the ergogenic benefit shown in thermoneutral environments with energy drink consumption.

ISBN: 9780438456426Subjects--Topical Terms:

518431
Physiology.

Energy Drink Consumption and Running Performance in a Hot Environment.
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300 $a 76 p.
500 $a Source: Masters Abstracts International, Volume: 58-02.
500 $a Adviser: David Hostler.
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520 $a Energy drinks have been reported to have an ergogenic effect on exercise performance but there are few objective reports on the interaction of energy drinks and exercise in the heat. The purpose of this investigation was to test the hypothesis that energy drink consumption prior to a 5-km time trial improves performance and alters thermoregulation in a hot environment. Methods: Sixteen experienced runners (9 males, age 22 +/- 3 years, VO2max: 52.7 +/- 7.2 ml/kg/min) completed two 5-km time trials in a double-blind, randomized, crossover design. Forty-five minutes after consuming 500 mL of a commercially available energy drink (ED; &sim;230 mg caffeine) or non-caloric taste-matched placebo (PL), subjects completed a steady state walk (30 minutes; 3 mph with a grade adjusted to achieve 50% of maximal heart rate) followed by the time trial. Experimental visits were completed on a treadmill in an environmental chamber set to 34°C and 40%RH. Subjects were instructed to run the 5-km in the least time possible but blinded to time and speed. Comparisons between beverages included heart rate (HR), core (Tc) and skin (Tsk) temperature, perceptions (RPE, thermal comfort and sensation, sweating), blood pressure (MAP), sweat rate, and time to completion. Results: During the steady state exercise, there was no difference in HR (Delta ED 32 +/- 14 vs. PL 32 +/- 12 bpm; p= 0.72), Tc (Delta ED 0.55 +/- 0.15 vs. PL 0.58 +/-0.24ºC; p= 0.779) or Tsk (Delta ED 2.6 +/- 0.7 vs. 2.4 +/- 0.7ºC; p= 0.768) between beverages. However, MAP was significantly higher with the ED at the end of steady-state exercise (ED 80 +/- 6.5 vs. PL 77 +/- 4 mmHg, p = 0.004). Sweat rate was lower with the ED (0.4 +/- 0.2 vs PL 0.6 +/- 0.4 L&dot;hr-1; p < 0.001). For the time trial, mean 5-km time to completion was not different between beverages (ED 1399 +/- 216 vs PL 1410 +/- 212 seconds; p= 0.476). HR was higher with the ED during the 5-km run (p = 0.03), but T c (p= 0.611), Tsk (p= 0.464) or RPE (p= 0.734) did not differ between beverages. Sweat rate was higher with the ED (1.4 +/- 0.5 vs 1.1 +/- 0.3 L&dot;hr-1; p = 0.05). However, total change in body mass, urine osmolality, and USG did not differ between beverages across the visits. Conclusions: Consuming an energy drink before running a 5-km in the heat did not improve running performance among young healthy runners. There was a minimal effect on thermoregulation and cardiovascular responses during both steady state and time trial exercise. Heat stress likely masks the ergogenic benefit shown in thermoneutral environments with energy drink consumption.
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