Reliability of the calculated maximal lactate steady state in amateur cyclists

Abstract

Complex performance diagnostics in sports medicine should contain maximal aerobic and maximal anaerobic performance. The requirements on appropriate stress protocols are high. To validate a test protocol quality criteria like objectivity and reliability are necessary. Therefore, the present study was performed in intention to analyze the reliability of maximal lactate production rate (V.Lamax) by using a sprint test, maximum oxygen consumption (V.O2max) by using a ramp test and, based on these data, resulting power in calculated maximum lactate-steady-state (PMLSS) especially for amateur cyclists. All subjects (n = 23, age 26 ± 4 years) were leisure cyclists. At three different days they completed first a sprint test to approximate V.Lamax. After 60 min of recreation time a ramp test to assess V.O2max was performed. The results of V.Lamax-test and V.O2max-test and the body weight were used to calculate PMLSS for all subjects. The intra class correlation (ICC) for V.Lamax and V.O2max was 0.904 and 0.987, respectively, coefficient of variation (CV) was 6.3% and 2.1%, respectively. Between the measurements the reliable change index of 0.11 mmol·l -1s -1 for V.Lamax and 3.3 mlkg -1min -1 for V.O2max achieved significance. The mean of the calculated PMLSS was 237 ± 72 W with an RCI of 9 W and reached with ICC = 0.985 a very high reliability. Both metabolic performance tests and the calculated PMLSS are reliable for leisure cyclists.

Evaluation of a sport-specific field test to determine maximal lactate accumulation rate and sprint performance parameters in running

“…6 The initial reliability ofVLa max was similar in terms of ICC and limits of agreement as previously found in cycling. 27 Whereas the ICC slightly decreased after initial familiarisation in cycling, VLa max demonstrated an increase in ICC and a lower TE from T2 to T3. Accordingly, the TE/SWC ratio decreased from >1.5 to <1.0 after initial familiarisation meaning that TE was lower compared to the SWC.…”

“…4,6,38 Consequently, faster sprints result in a lower denominator and thus higher estimation ofVLa max compared to cycling. 7,8,27 For the estimation of glycolytic power, the increase in lactate concentration (La ) is the key variable of this approach. An individual quantification of the underlying physiology (capacity and power of the phosphagenous system) cannot be provided using this approach.…”

“…ForVLa max , differences between trials were quantified using Bland-Altman plots and statistics including the limits of agreement (LoA). 27 At every trial (T1, T2 and T3), differences between measurement methods (LB and SW) in t 100 andVLa max were quantified using the standard error of estimate (SEE) and Bland-Altman statistics including the limits of agreement (LoA). 27 To assess the magnitude of the SEE with respect to the SWC, the ratio of SEE/SWC was calculated.…”

“…14,[18][19][20][21] In summary, by knowing the acute velocity of the athlete during an all-out exercise of 10 to 15 s, external work components, power output and thus t pmax−3.5% can be determined to calculateVLa max in running. Even though the need for an adequate, reliable and practical parameter of anaerobic metabolism in running has been stressed by several authors 2,22 , VLa max and/or its training induced changes have only been examined in swimming [23][24][25][26] and cycling [7][8][9]27,28 .…”

Adaption of Maximal Glycolysis Rate after Resistance Exercise with Different Volume Load

“…This measure describes the efficiency of the anaerobic energy metabolism, which increases significantly during strength training and is dependent on movement speed [14]. Good reproducibility of νLa max was shown during isokinetic force loading as well as sprint loading [15,16]. The adaptation of the νLa max has been examined in endurance studies.…”