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Effect of Training LoadStructure on Purine Metabolism in Middle-Distance Runners.
MedLine Citation:
PMID:  21364483     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
There are no studies analyzing the effect of training loads on purine metabolism during long training periods. PURPOSE:: To evaluate the effect of training load changes and subsequent detraining on purine metabolism in middle-distance runners during a 1-year cycle. METHODS:: In four characteristic points of the training cycle, loads assigned to5 intensity zones, pre- and post-exercise plasma hypoxanthine (Hx) and uric acid (UA), and erythrocyte hypoxanthine-guanine phosphoribosyltransferase (HGPRT) activity were determined in 11 male middle-distance runners at national level, mean age 22.3±0.7 years, practicing competitive sport for 8.1±0.3 years, body mass 73.0±3.4 kg, body height 180±2.2 cm. RESULTS:: In competition phase (CP), training loads in aerobic compensation zone and aerobic threshold zone decreased by 65.4% and by 20.5%, respectively. At the same time, anaerobic training loads increased by 132.5% in maximal oxygen consumption zone and by74.6% in lactic acid tolerance zone. Post-exercise Hx decreased significantly in CPby 6.2 μmol·l and increased in transition phase (TP) by 17.4 μmol·l. Both pre- and post-exercise HGPRT activity increased significantly in CPby 9.3 nmol·mg·hand by 4.9 nmol·mg·h respectively, and decreased significantly in TPby 10.6 nmol·mg·h and by 12.0 nmol·mg·h, respectively. A significant UA increase by 54 μmol·l was revealed merely in TP. CONCLUSION:: The effect of anaerobic training on purine metabolism is significant despite of a very short total duration of anaerobic loads. Elevated pre-exercise HGPRT activity in CP suggests adaptation changes consisting in a "permanent readiness" for purine salvage. The detraining in TP leads to reverse adaptation changes. Probably, plasma Hx concentration and erythrocyte HGPRT activity may be considered as a useful measure of training status.
Authors:
Jacek Zieliński; Krzysztof Kusy; Tadeusz Rychlewski
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-28
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-3-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Department of Athletics, University School of Physical Education, ul.DrogaDębińska7, 61-555Poznań, Poland 2Department of Physiology, University School of Physical Education, ul.KrólowejJadwigi 27/39, 61-871 Poznań, Poland.
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