title: The midpoint between ventilatory thresholds approaches maximal lactate steady state intensity in amateur cyclists.
abstract: The aim was to determine whether the midpoint between ventilatory thresholds (MPVT) corresponds to maximal lactate steady state (MLSS). Twelve amateur cyclists (21.0 ± 2.6 years old; 72.2 ± 9.0 kg; 179.8 ± 7.5 cm) performed an incremental test (25 W·min-1) until exhaustion and several constant load tests of 30 minutes to determine MLSS, on different occasions. Using MLSS determination as the reference method, the agreement with five other parameters (MPVT; first and second ventilatory thresholds: VT1 and VT2; respiratory exchange ratio equal to 1: RER = 1.00; and Maximum) was analysed by the Bland-Altman method. The difference between workload at MLSS and VT1, VT2, RER=1.00 and Maximum was 31.1 ± 20.0, -86.0 ± 18.3, -63.6 ± 26.3 and -192.3 ± 48.6 W, respectively. MLSS was underestimated from VT1 and overestimated from VT2, RER = 1.00 and Maximum. The smallest difference (-27.5 ± 15.1 W) between workload at MLSS and MPVT was in better agreement than other analysed parameters of intensity in cycling. The main finding is that MPVT approached the workload at MLSS in amateur cyclists, and can be used to estimate maximal steady state.
authors.affiliation: Department of Health and Human Performance, Technical University of Madrid, Madrid, Spain.
authors.forename: A B
authors.initials: AB
authors.lastname: Peinado
authors.affiliation: Department of Health and Human Performance, Technical University of Madrid, Madrid, Spain; College of Sciences, São Paulo State University (UNESP), Bauru (SP), Brazil.
authors.forename: Dm Pessôa
authors.initials: DP
authors.lastname: Filho
authors.affiliation: Department of Health and Human Performance, Technical University of Madrid, Madrid, Spain; Institute of Veterinary Physiology, University of Zurich, and Zurich Center for Integrative Human Physiology (ZIHP), Zurich, Switzerland.
authors.forename: V
authors.initials: V
authors.lastname: Díaz
authors.affiliation: Department of Health and Human Performance, Technical University of Madrid, Madrid, Spain.
authors.forename: P J
authors.initials: PJ
authors.lastname: Benito
authors.affiliation: Department of Health and Human Performance, Technical University of Madrid, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Álvarez-Sánchez
authors.affiliation: School of Education, Complutense University of Madrid, Madrid, Spain.
authors.forename: A G
authors.initials: AG
authors.lastname: Zapico
authors.affiliation: Department of Health and Human Performance, Technical University of Madrid, Madrid, Spain.
authors.forename: F J
authors.initials: FJ
authors.lastname: Calderón
keywords: Exercise test; Lactic acidosis; Respiratory physiology; Workload