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Journal of Nutrition and Human Health | Volume 3
May 23-24, 2019 | Vienna, Austria
Joint Event
2
nd
International Conference on
Gastroenterology and Digestive Disor
ders
17
th
International Conference on
Nutrition and Fitness
&
Effects of acute nitrate supplementation on repeated sprint performance in collegiate
soccer players
Gloria Velasquez, Nathan Hammon, McKenzie Moore
and
Jenna Bancroft
Mariano Galvez University, Guatemala
Background:
Acute (1.5-3 hours pre-exercise) dietary
nitrate (NO
3
) 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 O
2
is used to produce the same amount of ATP) and
less ATP necessary for muscle contractions. Dietary NO
3
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 NO
3
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 (pre-
to-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 NO
3
(800mg); mostly by improving sprint times, power output,
and RPE in collegiate soccer players.
Speaker 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:
gloriavelazquez@yahoo.com