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- Title
Accuracy of neuro-fuzzy logic and regression calculations in determining maximal lactate steady-state power output from incremental tests in humans.
- Authors
Smekal, Gerhard; Scharl, Arno; von Duvillard, Serge P.; Pokan, Rochus; Baca, Arnold; Baron, Ramon; Tschan, Harald; Hofmann, Peter; Bachl, Norbert
- Abstract
The aim of this study was to employ neuro-fuzzy logic and regression calculations to determine the accuracy of prediction of the power output (P) of the maximal lactate steady-state (MLSS) on a cycle ergometer calculated from the results of incremental tests. A group of 17 male and 17 female sports students underwent two incremental tests (a 1 min test T1: initial exercise intensity 0.2 W·kg–1 increasing 0.2 W·kg–1 every minute; a 3 min test T3: initial exercise intensity 0.6 W·kg–1 increasing 0.6 W·kg–1 every 3 min) and at least four constant-intensity tests of 30 min duration. Two models for MLSS calculation were developed using the data from T1 and T3, a forward stepwise linear regression model (REG) and a neuro-fuzzy model (FUZ). A group of 26 randomly selected subjects (model group, MG) were used to generate the REG and the FUZ models. The data from the remaining 8 subjects (4 men and 4 women; verifying group, VG) were used to verify the REG and FUZ models. The precision of the MLSS calculation in MG produced a better correlation when using data from T1 (REG r=0.95, FUZ r=0.99) than data from T3 (REG r=0.88, FUZ r=0.98). Our calculation models were confirmed using data from VG for T1 (REG r=0.97, FUZ r=0.98) as well as for T3 (REG r=0.97, FUZ r=0.97). Based on our subject population of young, healthy sport students, our results suggest that a single incremental test may be used for prediction of P at the MLSS using a cycle ergometer. Furthermore, the results from T1 yielded higher correlations compared to T3. Calculations from REG were similar to FUZ but the precision of REG and FUZ was better compared to calculations derived using data from a single threshold.
- Subjects
FUZZY logic; REGRESSION analysis; DYNAMOMETER; LACTATES; CARBOXYLIC acids; SPORTS; RECREATION
- Publication
European Journal of Applied Physiology, 2002, Vol 88, Issue 3, p264
- ISSN
1439-6319
- Publication type
Article
- DOI
10.1007/s00421-002-0702-5