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Determination of MLSS: two tests are better than one
Author(s) -
Yaeger Daniel B.,
Stavrianeas Stasinos
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.22.1_supplement.1175.10
Subject(s) - blood lactate , cycle ergometer , lactate threshold , mathematics , time trial , zoology , medicine , physical therapy , heart rate , biology , blood pressure
The Maximum Lactate Steady State (MLSS) is often estimated using a hybrid VO 2max /Lactate Threshold (LT) test even though the literature suggests that it yields a poor estimate of MLSS. We hypothesized that a second incremental test (SIT) improves estimation of MLSS. Trained cyclists (n=5) completed 2 incremental tests on a calibrated computer‐controlled cycle ergometer. After performing a VO 2peak test the LT initial was identified as visual deflection from baseline. In the SIT workload increased in 10 W increments from 30 W below to 30 W above the LT initial . The LT SIT was then identified using the visual deflection method. To verify the LT SIT as the MLSS, participants performed three 30‐minute bouts at 95%, 100%, and 105% of LT SIT intensity. Although the three intensities differed in workload by only 10 ± 1 W, Heart Rate, VO 2 , and blood lactate levels were different between the three workloads at all times (p < 0.01). The LT SIT was 99 ± 4% of MLSS, whereas the LT initial was 93 ± 10% of MLSS intensity. Furthermore, the SIT corresponded to 100% of MLSS for 2 of the cyclists and was within ± 5% of MLSS for all 5 cyclists. We conclude that the SIT greatly improves estimation of MLSS as compared to a single‐test protocol. Supported by NSF‐DUE‐CCLI #0511219, the Mary Stuart Rogers Foundation, and an APS Undergraduate Summer Research Fellowship (DBY).