Alicia Barringer1, Allison Cross1, Lauren Klump1, Brian Snyder1

1Truman State University, Kirksville, Missouri

Previous studies have reported that there may be an ergogenic effect of carbohydrate mouth rinsing on neuromuscular stimulation to enhance muscular endurance and performance. These effects have been suggested to be more potent when fasted or pre-fatigued prior to exercise testing. PURPOSE: The purpose of this study was to compare the effects of carbohydrate mouth rinsing and non-caloric placebo on glycogen reduced individuals’ 5k run performance. METHODS: Twelve moderately trained (VO2 peak 52.2±4.71 ml/kg/min; BMI 24.5±1.8; Wattmax 292.1±36.0) male athletes (23.3 ± 6.2 years) volunteered to participate in this study. The study consisted of baseline testing, a full familiarization trial, and then experimental trials using a counter-balanced, double-blind, randomized crossover design with either a non-caloric artificial sweetener placebo or a 10% maltodextrin mouthrinse (CHO). Experimental trials included an established cycle ergometer glycogen lowering protocol (GLP), an isokinetic/isometric assessment of strength, followed by a 5k run for time completed on a treadmill with speed set at predicted 5k running velocity. Participants were unaware of speed and verbally asked for changes as desired. Mouth rinse occurred for 10s after GLP, immediately before and after strength assessments, and at 0k, then at 2k and 4k for 3 seconds. Heart rate and time elapsed were recorded at each kilometer with rating of perceived exertion (RPE) recorded at 2k, 4k and completion. All measures are reported as mean ± SD. RESULTS: The 5k run showed no significant difference (p>0.05) between the treatment conditions (CHO 5k: 23:52 ±1:50 minutes/ Placebo 5k: 24:05±2:04 minutes). There was also no significant difference between 5k times for the 3rd and 4th visit, which indicated no training effect. There was no significant difference between treatment conditions considering average heart rate (CHO: 172.5±8.3 BPM/ Placebo: 171.2±7.3 BPM) or average RPE measurements (CHO: 16.6±1.3/ Placebo: 16.4±1.9). CONCLUSION: These data showed no significant ergogenic effect on running performance as indicated by the 5k run times completed after glycogen lowering exercise.

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