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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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EFFECTS OF SODIUM PHOSPHATE LOADING ON AEROBIC POWER AND CAPACITY IN OFF ROAD CYCLISTS |
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Milosz Czuba1  ,
Adam Zajac1, Stanislaw Poprzecki2, Jaroslaw Cholewa1
and Scott Woska3 |
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1Department of Sports Training, Academy of Physical Education, Katowice, Poland, 2Department of Biochemistry, Academy of Physical Education, Katowice, Poland, 3Galen Medical Institute, Bierun, Poland. |
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© Journal of Sports Science and Medicine (2009) 8, 591 - 599 |
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| ABSTRACT | |||
| The main aim of this paper was to evaluate the effects of short-
term (6 days) phosphate loading, as well as prolonged (21 days) intake of
sodium phosphate on aerobic capacity in off-road cyclists. Nineteen well-trained
cyclists were randomly divided into a supplemental (S) and control group
(C). Group S was supplemented for 6 days with tri-sodium phosphate, in a
dose of 50 mg·kg-1 of FFM/d, while a placebo was provided for the C group.
Additionally, group S was further subjected to a 3-week supplementation
of 25 mg·kg-1 FFM/d, while group C received 2g of glucose. The results indicate
a significant (p < 0.05) increase in VO2max,
VEmax, and O2/HR,
due to sodium phosphate intake over 6 days. Also a significant (p < 0.05)
decrease in HRrest and HRmax occurred. The supplementation procedure caused
a significant increase (p < 0.05) in Pmax and a shift of VAT towards
higher loads. There were no significant changes in the concentration of
2,3-DPG, acid-base balance and lactate concentration, due to phosphate salt
intake.
Key words: Tri-sodium phosphate, 2,3- diphosphoglycerate, oxygen uptake, off road cyclists. |
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