title: The Reliability of a Pre-Loaded Treadmill Time-Trial in Moderate Normobaric Hypoxia.
abstract: The purpose of this study was to assess the reliability of a pre-loaded 1 500-m treadmill time trial, conducted in moderate normobaric hypoxia. 8 trained runners/triathletes (24±3 years, 73.2±8.1 kg, 182.5±6.5 cm, altitude specific V˙O2max: 52.9±5.5 ml·kg(-1)·min(-1)) completed 3 trials (the first as a familiarisation), involving 2, 15-min running bouts at 45% and 65% V˙O2max, respectively, and a 1 500-m time trial in moderate normobaric hypoxia equivalent to a simulated altitude of 2 500 m (FiO2~15%). Heart rate, arterial oxygen saturation, skeletal muscle and cerebral tissue oxygenation (StO2), expired gas ( V˙O2 and V˙CO2), and ratings of perceived exertion were monitored. Running performance (Trial 1: 352.7±40; Trial 2: 353.9±38.2 s) demonstrated a low CV (0.9%) and high ICC (1). All physiological variables demonstrated a global CV≤4.2%, and ICC≥0.87, with the exception of muscle (CV 10.4%; ICC 0.70) and cerebral (CV 4.1%; ICC 0.82) StO2. These data demonstrate good reliability of the majority of physiological variables and indicate that a pre-loaded 1 500-m time trial conducted in moderate normobaric hypoxia is a highly reliable test of performance.
authors.affiliation: Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Carnegie Faculty, Headingley Campus, Headingley, Leeds, United Kingdom of Great Britain and Northern Ireland.
authors.forename: O
authors.initials: O
authors.lastname: Shannon
authors.affiliation: Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Carnegie Faculty, Headingley Campus, Headingley, Leeds, United Kingdom of Great Britain and Northern Ireland.
authors.forename: M
authors.initials: M
authors.lastname: Barlow
authors.affiliation: Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Carnegie Faculty, Headingley Campus, Headingley, Leeds, United Kingdom of Great Britain and Northern Ireland.
authors.forename: L
authors.initials: L
authors.lastname: Duckworth
authors.affiliation: Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Carnegie Faculty, Headingley Campus, Headingley, Leeds, United Kingdom of Great Britain and Northern Ireland.
authors.forename: D R
authors.initials: DR
authors.lastname: Woods
authors.affiliation: Department of Vascular Surgery, Royal Stoke University Hospital, Newcastle Road, Stoke on Trent, United Kingdom of Great Britain and Northern Ireland.
authors.forename: T
authors.initials: T
authors.lastname: Barker
authors.affiliation: Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Carnegie Faculty, Headingley Campus, Headingley, Leeds, United Kingdom of Great Britain and Northern Ireland.
authors.forename: A
authors.initials: A
authors.lastname: Grindrod
authors.affiliation: Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Carnegie Faculty, Headingley Campus, Headingley, Leeds, United Kingdom of Great Britain and Northern Ireland.
authors.forename: A
authors.initials: A
authors.lastname: Griffiths
authors.affiliation: Institute for Sport, Physical Activity and Leisure, Leeds Beckett University, Carnegie Faculty, Headingley Campus, Headingley, Leeds, United Kingdom of Great Britain and Northern Ireland.
authors.forename: J P
authors.initials: JP
authors.lastname: O'Hara
mesh_terms: D000328:Adult; D005080:Exercise Test; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D000860:Hypoxia / Q000378:metabolism*; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D010100:Oxygen / Q000097:blood; D011659:Pulmonary Gas Exchange; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D055815:Young Adult
chemical_list: D010100:Oxygen