Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine ( 2008 ) 07 , 279 - 285

Research article
Lactate Kinetics After Intermittent and Continuous Exercise Training
Adnene Gharbi1,2, , Karim Chamari3, Amjad Kallel4, Saîd Ahmaidi5, Zouhair Tabka1, Zbidi Abdelkarim1
Author Information
1 Laboratory of Cardio-Circulatory, Respiratory, Metabolic and Hormonal Adaptations to the Muscular Exercise, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia
2 High Institute of Sport and Physical Education, Gafsa, Tunisia
3 Research Unit "Evaluation, Sport, Health" National Center of Medicine and Sciences in Sports (CNMSS), El Menzah, Tunisia
4 ISSTEG University Gabes-Tunisia,
5 Research Laboratory "APS and Motor Skills: Adaptations and Rehabilitations," Faculty of Sports Sciences, Jules Verne Picardie University, Amiens, France

Adnene Gharbi
✉ Laboratory of Cardio-Circulatory, Respiratory, Metabolic and Hormonal Adaptations to the Muscular Exercise, Faculty of Medicine Ibn El Jazzar, 4002, Sousse, Tunisia
Email: adnenegharbi@yahoo.fr
Publish Date
Received: 14-01-2008
Accepted: 22-04-2008
Published (online): 01-06-2008
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ABSTRACT

The purpose of this study was to assess, the effects of continuous and intermittent exercise training on lactate kinetic parameters and maximal aerobic speed (MAS) using field tests. Twenty-four male sport students were equally divided into continuous (CT) and intermittent (IT) physically trained groups. Another six participants acted as non-trained controls (CG). The trained participants practiced 6-days per week for 6 weeks. Before and after training, all participants completed an incremental exercise test to assess their MAS, and a 30- second supra-maximal exercise followed by 30 minutes of active recovery to determine the individual blood lactate recovery curve. It was found that exercise training has significantly increased MAS (p < 0.001), the lactate exchange and removal abilities as well as the lactate concentrations at the beginning of the recovery ([La]-(0)); for both CT and IT groups; this was accompanied by a significant reduction of the time to lactate-peak. Nevertheless, the improvement in MAS was significantly higher (p < 0.001) post-intermittent (15.1 % ± 2.4) than post-continuous (10.3 % ± 3.2) training. The lactate-exchange and removal abilities were also significantly higher for IT than for CT-group (P<0.05). Moreover, IT-group showed a significantly shorter half-time of the blood lactate (t-½-[La]) than CT-group (7.2 ± 0.5 min vs 7.7 ± 0.3 min, respectively) (p < 0.05). However, no significant differences were observed in peak blood lactate concentration ([La]peak), time to reach [La]peak (t-[La]peak), and [La]-(0) between the two physically-trained groups. We conclude that both continuous and intermittent training exercises were equally effective in improving t-[La]peak and [La]peak, although intermittent training was more beneficial in elevating MAS and in raising the lactate exchange (γ1) and removal (γ2) indexes.

Key words: Biexponential mathematical model, recovery, supra-maximal exercise.


           Key Points
  • Coaches and athletes need to be aware of the potentiality positive effects of exercise intensity.
  • Improvements in physical fitness are associated with a concomitant increase in the lactate removal ability.
  • In order to reduce lactate accumulation and increase maximal aerobic speed maximally, interval training method, with work speeds equal to 90% - 100% of MAS, may be the effective way when compared with continuous training method.
 
 
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