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Titolo:
Blood lactate response to overtraining in male endurance athletes
Autore:
Bosquet, L; Leger, L; Legros, P;
Indirizzi:
Univ Montreal, Dept Kinesiol, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 ol, Montreal, PQ H3C 3J7, Canada Univ Poitiers, Fac Sci Sport, F-86000 Poitiers, France Univ Poitiers Poitiers France F-86000 ci Sport, F-86000 Poitiers, France
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1-2, volume: 84, anno: 2001,
pagine: 107 - 114
SICI:
1439-6319(200101/02)84:1-2<107:BLRTOI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEART-RATE; PERCEIVED EXERTION; MUSCLE GLYCOGEN; EXERCISE; PERFORMANCE; SPORTS; RECOMMENDATIONS; THRESHOLD; INDICATOR; DISTANCE;
Keywords:
overtraining; overreaching; blood lactate concentration; ratings of perceived exertion; running;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Bosquet, L Univ Montreal, Dept Kinesiol, CP 6128,Succ Ctr Ville, Montreal,PQ H3C 3J7, Canada Univ Montreal CP 6128,Succ Ctr Ville Montreal PQ CanadaH3C 3J7
Citazione:
L. Bosquet et al., "Blood lactate response to overtraining in male endurance athletes", EUR J A PHY, 84(1-2), 2001, pp. 107-114

Abstract

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 ofovertraining 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 andpsychological 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 primarilythe 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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Documento generato il 15/01/21 alle ore 23:07:03