title: Laboratory predictors of uphill cycling performance in trained cyclists.
abstract: This study aimed to assess the relationship between an uphill time-trial (TT) performance and both aerobic and anaerobic parameters obtained from laboratory tests. Fifteen cyclists performed a Wingate anaerobic test, a graded exercise test (GXT) and a field-based 20-min TT with 2.7% mean gradient. After a 5-week non-supervised training period, 10 of them performed a second TT for analysis of pacing reproducibility. Stepwise multiple regressions demonstrated that 91% of TT mean power output variation (W kg-1) could be explained by peak oxygen uptake (ml kg-1.min-1) and the respiratory compensation point (W kg-1), with standardised beta coefficients of 0.64 and 0.39, respectively. The agreement between mean power output and power at respiratory compensation point showed a bias ± random error of 16.2 ± 51.8 W or 5.7 ± 19.7%. One-way repeated-measures analysis of variance revealed a significant effect of the time interval (123.1 ± 8.7; 97.8 ± 1.2 and 94.0 ± 7.2% of mean power output, for epochs 0-2, 2-18 and 18-20 min, respectively; P < 0.001), characterising a positive pacing profile. This study indicates that an uphill, 20-min TT-type performance is correlated to aerobic physiological GXT variables and that cyclists adopt reproducible pacing strategies when they are tested 5 weeks apart (coefficients of variation of 6.3; 1 and 4%, for 0-2, 2-18 and 18-20 min, respectively).
authors.affiliation: a Faculdade de Educação Física e Desportos , Universidade Federal de Juiz de Fora , Juiz de Fora , Minas Gerais , Brazil.
authors.forename: Arthur Henrique
authors.initials: AH
authors.lastname: Bossi
authors.affiliation: a Faculdade de Educação Física e Desportos , Universidade Federal de Juiz de Fora , Juiz de Fora , Minas Gerais , Brazil.
authors.forename: Pedro
authors.initials: P
authors.lastname: Lima
authors.affiliation: a Faculdade de Educação Física e Desportos , Universidade Federal de Juiz de Fora , Juiz de Fora , Minas Gerais , Brazil.
authors.forename: Jorge Perrout de
authors.initials: JP
authors.lastname: Lima
authors.affiliation: b School of Sport and Exercise Sciences , University of Kent , Chatham Maritime, Chatham, Kent , England , UK.
authors.forename: James
authors.initials: J
authors.lastname: Hopker
mesh_terms: D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D001642:Bicycling / Q000502:physiology*; D015992:Body Mass Index; D005260:Female; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D012123:Pulmonary Ventilation; D015203:Reproducibility of Results; D013647:Task Performance and Analysis; D013997:Time Factors
keywords: Power output; VO2max; field test; pacing strategy; self-paced exercise