Document Detail


Dependence of the maximal lactate steady state on the motor pattern of exercise.
MedLine Citation:
PMID:  11375880     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Blood lactate concentration (BLC) can be used to monitor relative exercise intensity. The highest BLC representing an equilibrium between lactate production and elimination is termed maximal lactate steady state (MLSS). MLSS is used to discriminate qualitatively between continuous exercise, which is limited by stored energy, from other types of exercise terminated because of disturbance of cellular homoeostasis. AIM: To investigate the hypothesis that MLSS intraindividually depends on the mode of exercise. METHODS: Six junior male rowers (16.5 (1.4) years, 181.7 (3.1) cm, 69.8 (3.3) kg) performed incremental and constant load tests on rowing and cycle ergometers. Measurements included BLC, sampled from the hyperaemic ear flap, heart rate, and oxygen uptake. MLSS was defined as the highest BLC that increased by no more than 1.0 mmol/l during the final 20 minutes of constant workload. RESULTS: In all subjects, MLSS was lower (p < or = 0.05) during rowing (2.7 (0.6) mmol/l) than during cycling (4.5 (1.0) mmol/l). No differences between rowing and cycling were found with respect to MLSS heart rate (169.2 (9.3) v 172.3 (6.7) beats/min), MLSS workload (178.7 (29.8) v 205.0 (20.7) W), MLSS intensity expressed as a percentage (63.3 (6.6)% v 68.6 (3.8)%) of peak workload (280.8 (15.9) v 299.2 (28.4) W) or percentage (76.4 (3.4)% v 75.1 (3.0)%) of peak oxygen uptake (60.4 (3.4) v 57.2 (8.6) ml/kg/min). CONCLUSIONS: In rowing and cycling, the MLSS but not MLSS workload and MLSS intensity intraindividually depends on the motor pattern of exercise. MLSS seems to decrease with increasing mass of the primarily engaged muscle. This indicates that task specific levels of MLSS occur at distinct levels of power output per unit of primarily engaged muscle mass.
Authors:
R Beneke; R M Leithäuser; M Hütler
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British journal of sports medicine     Volume:  35     ISSN:  0306-3674     ISO Abbreviation:  Br J Sports Med     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-05-28     Completed Date:  2001-08-02     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0432520     Medline TA:  Br J Sports Med     Country:  England    
Other Details:
Languages:  eng     Pagination:  192-6     Citation Subset:  IM    
Affiliation:
Sports Medicine, Free University, Berlin, Germany. rabe94@zedat.fu-berlin.de
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Exercise Tolerance
Humans
Lactic Acid / blood,  metabolism*
Linear Models
Male
Sports / physiology*
Statistics, Nonparametric
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid
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