Effects of acute nitrate supplementation on repeated sprint performance in collegiate soccer players
Joint Event on 17th International Conference on Nutrition and Fitness & 2nd International Conference on Gastroenterology and Digestive Disorders
May 23-24, 2019 | Vienna, Austria
Gloria Velasquez, Nathan Hammon, McKenzie Moore and Jenna Bancroft
Mariano Galvez University, Guatemala
Scientific Tracks Abstracts : J Nutr Hum Health
Abstract:
Background: Acute (1.5-3 hours pre-exercise) dietary
nitrate (NO3) has been shown to improve blood flow to
active muscle tissue under hypoxic conditions (which
occurs during repeated sprints). Additionally, multiday (≥
3days) supplementation improves mitochondrial efficiency
(less O2 is used to produce the same amount of ATP) and
less ATP necessary for muscle contractions. Dietary NO3
improves ATP turnover, reduces PCr generation (less
Pi), and improves type II force production, which can
improve repeated sprint performance. The study aimed
to determine the effect of acute NO3 supplementation on
repeated sprint performance in trained collegiate athletes
during field-based sprint tests.
Methods: A single-blinded, randomized crossover study
was performed over one week on eight healthy collegiate
male soccer players (ages 21.1 ± 1.4 years). Participants
completed a warm- up, a protocol consisting of 6x40m
max sprints, followed by 30s active recovery. An electronic
timing system was used. Immediately afterwards, subjects
took 140mL of a placebo or a beet root juice (BRJ) shot.
After 2 hours they performed the prior warm-up and sprint
protocol.
Results: A trend towards significant condition effect (preto-
post) was demonstrated for BRJ group in sprint time (p =
0.10) with an average reduction of 0.3% (-0.017s), whereas
placebo increased by 1.96% (+0.117s). Likewise, for overall
power (p = 0.06) with an average increase of 1.5% (+9.68
watts) for BRJ, whereas placebo decreased by 4.29%
(-26.12 watts). Also, a trend was discovered regarding a
significant interaction effect for RPE during the trials (p =
0.08), suggesting RPE decreased to a greater extent (-30.3%
or -2.1 units) during the BRJ post trial versus placebo.
Conclusions: In summary, this study demonstrated a trend
towards a significant effect in the enhancement of repeated
sprint performance when acutely supplementing NO3
(800mg); mostly by improving sprint times, power output,
and RPE in collegiate soccer players.
Biography:
Gloria Velasquez is a licensed dietitian with a Master of Science in Exercise and Nutrition Science from Tampa University, USA, as well as degrees in Nutrition from Long Island University in New York, De Leon University in Spain and Del Valle University in Guatemala. She published her research papers in Columbia and United States which was presented at the American College of Sports Medicine World Congress and at the International Society of Sports Nutrition Conference (ISSN). She is a graduate level professor at Mariano Galvez University in Guatemala for the master’s program in Sports Nutrition and has worked as a Certified Sports Dietitian with the Autonomous Sports Confederation/ Olympic Committee of Guatemala for the past 12 years. She is also the President and Director of the Organizing Committee for the ISSN annual conference in Guatemala.
E-mail: gloriavelazquez@yahoo.com
PDF HTML