european college of sport science

Friday, June 26th, 2009
THE JUSTIFICATION OF DIET SUPPLEMENTATION OF THE POLISH NATIONAL TEAM OF ATHLETES
CZAJA, J., LEBIEDZIŃSKA, A., SZEFER, P.
MEDICAL UNIVERSITY OF GDANSK
Nutrition is an important aspect of an athlete’s training program. Every deficiency and excessive intake of nutritive elements may negatively
influence sportsman performance especially high class athletes. However, for various reasons, not all athletes are able to consume
a diet that meets nutritional needs and thus resort to nutritional supplements with the intention of preventing deficiencies and even enhancing
performance (1, 2, 3).
The aim of the study was to examine the justification of the diet supplementation.
The investigation was carried out on a group of 62 athletes, members of Polish national team of middle and long distance runners (24
women aged between 19-31 and 38 men aged between 18-36). General information concerning respondents, their nutrition (food consumed
within 24 hours before an interview) and their diet supplementation (frequency and quality) was gathered using the method of
questionnaire interview at training camps and sport competitions. Values of energy and nutritive elements contents in athlete’s diets were
calculated by means of a computer program “Wikt 1.3” based on current tables of food products’ nutritional value prepared by the National
Food and Nutrition Institute in Warsaw (2001).
In the result of the investigation concerning diets quality some abnormalities has occurred. The examined daily food portions of women
(W) and men (M) supplied amount of energy (2892 kcal-W; 3955 kcal-M) sufficient to fulfill daily requirement in case of moderate active
people, not high class athletes. The investigated diets provided too low energy from carbohydrates and proteins limited by greater percentage
of delivered energy from fat. The quantity of macroelements (Ca, P, Na, K, Mg), microelements (Zn, Cu, Mn) and vitamins (A, D, B
group, C) in the analyzed diets was sufficient to fulfill daily requirement of athletes. The examined diets provided insufficient amount of Fe
and vitamin E to ensure against potential deficiency.
According to diet supplementation 100% of the examined women and 94,7% of the examined men used dietary supplements. Most of
the investigated athletes reached for carbohydrates powder products, vitamin-mineral products, vitamins C and B group, ferrum and
magnesium supplements. Moreover, the examined runners also often enriched their diet in BCAA and carnitine.
In the analyzed daily food rations of Polish national team of runners only carbohydrates, ferrum and vitamin E supplementation seems to
be justified.
1. Benardot, D. (2000). Nutrition for serious athletes. An advanced guide to foods, fluids, and supplements for training and performance.
Human Kinetics, Champaign, USA
2. Lukaski, H.C. (2004). Vitamin and Mineral Status: Effects on Physical Performance. Nutrition, 20, 632-644
3. Williams, M.H. (1999). The Ergogenics Edge. Granice wspomagania. Medicina Sportiva, Kraków
THE EFFECT OF ORAL VANADYL SULPHATE ON MUSCULAR STRENGTH, POWER AND BODY COMPOSITION IN
TRAINED AND NON-TRAINED MALES
VLECK, V., ALI, A.
UNIVERSITY OF WESTMINSTER
Background: Athletes use vanadyl sulphate supplementation to promote muscle growth and glycogen synthesis in the muscle and liver,
with little scientific basis (Jentjens and Jeukendrup, 2002).
Purpose: To investigate the effects of oral Vanadyl Sulphate (VOSO4)
(30mg/day) supplementation on anthropometrical variables, body composition, and performance within a double blind, placebocontrolled
trial of both untrained and trained participants.
Method: Eleven males (mean ± SD age 24 ± 2 yrs, mass 74 ± 11 kg), of whom n=5 were classed as trained and n=6 as untrained (mean
± SD scheduled training hrs/ wk 6 ± 2 and 0.05 level, for bench press one-rep maximum (1RM) (Bas 79 ± 8 kg, VS 84 ± 9 kg, P 80 ± 8 kg), leg extension 1RM (Bas 54 ± 4 kg, VS 60
± 3 kg, P 58 ± 3kg) vertical jump height (B 0.44 ± 0.03m, VS 0.43 ± 0.02m, P 0.43 ± 0.02m), peak power (B 734 ± 44 W, VS 783 ± 42 W, p
786 ± 44 W), average power (B 663 ± 34 W, VS 723 ± 40 W, B 705 ± 33 W), or fatigue ratio (B 9 ± 2, VS 11 ± 2, P 11 ± 2), biceps girth (B33 ±
1mm, VS 34 ± 1mm, P 33 ± 1mm), or (BODPOD) % body fat (B 13 ± 1, VS 13 ± 2, P 14 ± 1). However, VS values tended to be higher than B or
P values (NS); and more so in trained than in untrained subjects (NS), especially for bench press 1RM (trained B 98 ± 33 kg, VS 101 ± 39 kg,
P 100 ± 33 kg; untrained B 61 ± 11 kg, VS 65 ± 3 kg, P 67 ± 7 kg).
Conclusions:
The influence of 1 week of oral VS supplementation on muscular strength and anthropometric variables, and the extent to which this is
influenced by subjects’ training status, requires further investigation using larger sample sizes.
References:
Jentjens & Jeukendrup (2002) Int J Sport Nut Exerc Metab, 12, 470-9.
OSLO/NORWAY, JUNE 24-27, 2009 377