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Reliability of the calculated maximal lactate steady state in amateur cyclists.

Adam J, Öhmichen M, Öhmichen E, Rother J, Müller UM, Hauser T, Schulz H - Biol Sport (2015)

Bottom Line: Therefore, the present study was performed in intention to analyze the reliability of maximal lactate production rate ([Formula: see text]Lamax) by using a sprint test, maximum oxygen consumption ([Formula: see text]O2max) by using a ramp test and, based on these data, resulting power in calculated maximum lactate-steady-state (PMLSS) especially for amateur cyclists.The results of [Formula: see text]Lamax-test and [Formula: see text]O2max-test and the body weight were used to calculate PMLSS for all subjects.Both metabolic performance tests and the calculated PMLSS are reliable for leisure cyclists.

View Article: PubMed Central - PubMed

Affiliation: Technische Universität Chemnitz ; University of Leipzig, Heart Centre, Department of Internal Medicine/Cardiology, Leipzig, Germany.

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 ([Formula: see text]Lamax) by using a sprint test, maximum oxygen consumption ([Formula: see text]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 [Formula: see text]Lamax. After 60 min of recreation time a ramp test to assess [Formula: see text]O2max was performed. The results of [Formula: see text]Lamax-test and [Formula: see text]O2max-test and the body weight were used to calculate PMLSS for all subjects. The intra class correlation (ICC) for [Formula: see text]Lamax and [Formula: see text]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 (-1)s (-1) for [Formula: see text]Lamax and 3.3 mlkg (-1)min (-1) for [Formula: see text]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.

No MeSH data available.


Bland-Altman plotsCV - coefficient of variation, ICC - Intraclass correlation coefficient, PMLSS - power in maximal lactate steady state, RCI - reliable change index, Lamax - maximum glycolytic metabolic performance, O2max - maximum oxygen consumption at maximum load
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Figure 0001: Bland-Altman plotsCV - coefficient of variation, ICC - Intraclass correlation coefficient, PMLSS - power in maximal lactate steady state, RCI - reliable change index, Lamax - maximum glycolytic metabolic performance, O2max - maximum oxygen consumption at maximum load

Mentions: All measured parameters of Lamax, the O2max and the PMLSS of all subjects at the first, second and third test day are presented in Table 1. All parameters used to calculate Lamax (LaPre, LamaxPost, the difference of LamaxPost and LaPre (Ladiff), talac and PW showed a reasonable reliability according to an ICC between 0.804 and 0.891 (Table 2), resulting in an ICC of Lamax of 0.904. With an RMSE of 0.045 mmol·l-1s-1 the mean value of Lamax of the study group is 0.71 ± 0.088 mmol·l-1s-1. The RCI for inter- and intraindividual measurements of Lamax is 0.11 mmol·l-1s-1 assumed a significant difference between two measurements with an expected CV of 6.3%. Looking for intraindividual changes seven of our 23 subjects showed significant differences (difference ≥ 0.11 mmol·l-1s-1) of Lamax within the three test days (Figure 1).


Reliability of the calculated maximal lactate steady state in amateur cyclists.

Adam J, Öhmichen M, Öhmichen E, Rother J, Müller UM, Hauser T, Schulz H - Biol Sport (2015)

Bland-Altman plotsCV - coefficient of variation, ICC - Intraclass correlation coefficient, PMLSS - power in maximal lactate steady state, RCI - reliable change index, Lamax - maximum glycolytic metabolic performance, O2max - maximum oxygen consumption at maximum load
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4296210&req=5

Figure 0001: Bland-Altman plotsCV - coefficient of variation, ICC - Intraclass correlation coefficient, PMLSS - power in maximal lactate steady state, RCI - reliable change index, Lamax - maximum glycolytic metabolic performance, O2max - maximum oxygen consumption at maximum load
Mentions: All measured parameters of Lamax, the O2max and the PMLSS of all subjects at the first, second and third test day are presented in Table 1. All parameters used to calculate Lamax (LaPre, LamaxPost, the difference of LamaxPost and LaPre (Ladiff), talac and PW showed a reasonable reliability according to an ICC between 0.804 and 0.891 (Table 2), resulting in an ICC of Lamax of 0.904. With an RMSE of 0.045 mmol·l-1s-1 the mean value of Lamax of the study group is 0.71 ± 0.088 mmol·l-1s-1. The RCI for inter- and intraindividual measurements of Lamax is 0.11 mmol·l-1s-1 assumed a significant difference between two measurements with an expected CV of 6.3%. Looking for intraindividual changes seven of our 23 subjects showed significant differences (difference ≥ 0.11 mmol·l-1s-1) of Lamax within the three test days (Figure 1).

Bottom Line: Therefore, the present study was performed in intention to analyze the reliability of maximal lactate production rate ([Formula: see text]Lamax) by using a sprint test, maximum oxygen consumption ([Formula: see text]O2max) by using a ramp test and, based on these data, resulting power in calculated maximum lactate-steady-state (PMLSS) especially for amateur cyclists.The results of [Formula: see text]Lamax-test and [Formula: see text]O2max-test and the body weight were used to calculate PMLSS for all subjects.Both metabolic performance tests and the calculated PMLSS are reliable for leisure cyclists.

View Article: PubMed Central - PubMed

Affiliation: Technische Universität Chemnitz ; University of Leipzig, Heart Centre, Department of Internal Medicine/Cardiology, Leipzig, Germany.

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 ([Formula: see text]Lamax) by using a sprint test, maximum oxygen consumption ([Formula: see text]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 [Formula: see text]Lamax. After 60 min of recreation time a ramp test to assess [Formula: see text]O2max was performed. The results of [Formula: see text]Lamax-test and [Formula: see text]O2max-test and the body weight were used to calculate PMLSS for all subjects. The intra class correlation (ICC) for [Formula: see text]Lamax and [Formula: see text]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 (-1)s (-1) for [Formula: see text]Lamax and 3.3 mlkg (-1)min (-1) for [Formula: see text]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.

No MeSH data available.