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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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EXERCISE PHYSIOLOGY AND BIOMECHANICS
Baldari C. 1, Videira M. 2, Madeira F. 3, Sergio J. 3, Guidetti L. 1
1 University Institute of Motor Sciences (IUSM), Rome, Italy
2 University of Tras-os-Montes and Alto Douro (UTAD) Vila Real, Portugal
3 Faculty of Human Motricity (FMH), Lisbon, Portugal
Aim. Optimal lactate removal was reported to occur at workrate between 30% and 70% V.O2max. However, it has been recently recommended to quantify exercise intensity not in percentage of V.O2max but in relation to validated metabolic reference points such as the individual anaerobic threshold (IAT) and the individual ventilatory threshold (IVT). The purpose of this study was to examine the effect on lactate removal of different recovery workrates below the IAT defined calculating the difference (∆T) between IAT and IVT, then choosing the IVT+50%∆T, the IVT and the IVT-50%∆T workrates.
Methods. Eight male triathletes (V.O2max 69.7±4.7, V.O2IAT 52.9±4, V.O2IVT 41.1±4.7 mL.kg-1.min-1), after a 6-min treadmill run at 75% of difference between IAT and V.O2max, performed in a random order the following 30-min recovery treatments: 1) run at IVT+50%∆T, 2) at IVT, 3) at IVT-50%∆T, 4) passive. Blood lactate was measured at 1, 3, 6, 9, 12, 15, 20, 25, 30 minutes of recovery.
Results. All active recovery workrates (from 50±5% to 67±4% V.O2max) were within the range previously reported for optimal lactate removal, and significantly more efficient than passive recovery on lactate removal curve (% of accumulated lactate above rest value). However, significant differences (P<0.01) were found among active recovery intensities: the IVT-50%∆T was the most efficient workrate from the 9th minute to 30th minute.
Conclusion. In triathletes, the IVT-50%∆T was the optimal workrate for lactate removal; moreover none of the studied active workrate showed further lactate decrease after the 20th minute of recovery.