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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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LACTATE KINETICS AFTER INTERMITTENT AND CONTINUOUS EXERCISE TRAINING |
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Adnene Gharbi1,2  ,
Karim Chamari3, Amjad Kallel4, Saîd Ahmaidi5, Zouhair Tabka1 and Zbidi Abdelkarim1 |
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1Laboratory of Cardio-Circulatory, Respiratory, Metabolic and Hormonal Adaptations to the Muscular Exercise, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia., 2High Institute of Sport and Physical Education, Gafsa, Tunisia, 3Research Unit "Evaluation, Sport, Health" National Center of Medicine and Sciences in Sports (CNMSS), El Menzah, Tunisia, 4ISSTEG University Gabes-Tunisia, 5Research Laboratory "APS and Motor Skills: Adaptations and Rehabilitations," Faculty of Sports Sciences, Jules Verne Picardie University, Amiens, France. |
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© Journal of Sports Science and Medicine (2008) 7, 279 - 285 Search Google Scholar for Citing Articles |
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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. |
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