n International SportMed Journal - Adaptations of lactate kinetics to mixed and continuous training : original research article
|Article Title||Adaptations of lactate kinetics to mixed and continuous training : original research article|
|© Publisher:||International Federation of Sports Medicine|
|Journal||International SportMed Journal|
|Author||Adnene Gharbi, Karim Chamari, Imed Latiri, Zouhair Tabka and Abdelkarim Zbidi|
|Publication Date||Jan 2008|
|Pages||172 - 181|
|Keyword(s)||Bi-compartmental model, Lactate metabolism, Recovery, Supramaximal exercise and Training mode|
The purpose of this study was to compare the differences in lactate parameters and maximal aerobic speed (MAS) adaptations to mixed and continuous training. Twenty-four subjects were equally divided into continuous (CT) (age 21.3± 1.2 years; body mass 69 ± 3kg; height 172 ± 2cm) or mixed (MT) (age 20 ± 2 years; body mass 68.5 ± 4kg; height 171 ± 3cm) training groups. Another six participants (age 21± 1.2 years; body mass 69.3 ± 3.4kg; height 174 ± 5cm) acted as non-training controls (CG). The trained participants practiced 6d/wk for 6 weeks. Before and after training, all participants completed an incremental exercise test to assess their MAS, and a 30 second supramaximal exercise followed by 30 minutes of active recovery. Blood lactate recovery curves from the supramaximal exercise were fitted to a bi-exponential time function. Following the training period, there was a significant increase in MAS, a significant increase in lactate exchange (γ1) and removal (γ2) abilities (P<0.001), a significantly faster time to peak lactate (t-[La]peak) (P<0.001), a significant decrease in lactate half time (t-½-[La]) (P<0.001) , and significantly higher lactate concentration at the beginning of the recovery for both the continuous and mixed training groups(P<0.05). The increases in MAS was significantly higher (P<0.001) in MT-group compared to CT-group (15.6 ± 3.1% vs. 10.3 ± 3.2%). The lactate-exchange ability was also significantly higher post-mixed than post-continuous training (0.606 ± 0.099 min vs. 0.548 ± 0.237min) (P<0.05). However, no significant difference was observed in the other lactate parameters. These authors conclude that both mixed and continuous training were equally effective in altering t [La]peak, t-½-[La] and γ2 ability, but mixed training was more effective in elevating both MAS and γ1.
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