| Blood lactate response to overtraining in male endurance athletes. | |
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MedLine Citation:
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PMID: 11394238 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Many physiological markers vary similarly during training and overtraining. This is the case for the blood lactate concentration ([La-]b), since a right shift of the lactate curve is to be expected in both conditions. We examined the possibility of separating the changes in training from those of overtraining by dividing [La-]b by the rating of perceived exertion ([La-]b/RPE) or by converting [La-]b into a percentage of the peak blood lactate concentration ([La-]b,peak). Ten experienced endurance athletes increased their usual amount of training by 100% within 4 weeks. An incremental test and a time trial were performed before (baseline) and after this period of overtraining, and after 2 weeks of recovery (REC). The [La-]b and RPE were measured during the recovery of each stage of the incremental test. We diagnosed overtraining in seven athletes, using both physiological and psychological criteria. We found a decrease in mean [La-]b,peak from baseline to REC [9.64 (SD 1.17), 8.16 (SD 1.31) and 7.69 (SD 1.84) mmol.l-1, for the three tests, respectively; P < 0.05] and a right shift of the lactate curve. Above 90% of maximal aerobic speed (MAS) there was a decrease of mean [La-]b/RPE from baseline to REC [at 100% of MAS of 105.41 (SD 17.48), 84.61 (SD 12.56) and 81.03 (SD 22.64) arbitrary units, in the three tests, respectively; P < 0.05), but no difference in RPE, its variability accounting for less than 25% of the variability of [La-]b/RPE (r = 0.49). Consequently, [La-]b/RPE provides little additional information compared to [La-]b alone. Expressing [La-]b as a %[La-]b,peak resulted in a suppression of the right shift of the lactate curve, suggesting it was primarily the consequence of a decreased production of lactate by the muscle. Since the right shift of the curve induced by optimal training is a result of improved lactate utilization, the main difference between the two conditions is the decrease of [La-]b,peak during overtraining. We propose retaining it as a marker of overtraining for long duration events, and repeating its measurement after a sufficient period of rest to make the distinction with overreaching. |
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Authors:
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L Bosquet; L Léger; P Legros |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: European journal of applied physiology Volume: 84 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2001 Jan-Feb |
Date Detail:
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Created Date: 2001-06-07 Completed Date: 2001-10-18 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 107-14 Citation Subset: IM |
Affiliation:
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Département de Kinésiologie, Université de Montréal, CP 6128, succ. centre ville, Montréal, Québec, Canada H3C 3J7. laurent.bosquet@mshs.univ-poitiers.fr |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Exercise / physiology* Fatigue / physiopathology Humans Lactic Acid / blood* Linear Models Male Physical Endurance / physiology* Questionnaires Running / physiology |
| Chemical | |
Reg. No./Substance:
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50-21-5/Lactic Acid |
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