title: Muscle oxygenation and blood volume reliability during continuous and intermittent running.
abstract: The reliability of near infrared spectroscopy derived tissue oxygenation index (TOI) and total haemoglobin concentration (tHb) were examined during continuous (CR) and interval (INT) running. In a repeated measures design, 10 subjects twice performed 30 min of CR at 70% of their peak treadmill velocity, followed by 10 bouts of INT at 100%. Between trial reliability of mean and amplitude changes in TOI and tHb during CR were determined. Muscle de-oxygenation and re-oxygenation rates during INT were calculated using 3 analytical methods; i) linear modelling, ii) minimum and maximum values during work/rest intervals, and iii) mean values during work/rest intervals. Reliability was assessed using coefficient of variation (CV; %). During CR, mean TOI was more reliable (3.5%) compared with TOI amplitude change (34.7%), while mean tHb (12%) was similar to both absolute (9.2%) and relative (10.2%) amplitude changes. During INT, de-oxygenation rates analysed via linear modelling produced the lowest CV (7.2%), while analysis using min-max values produced the lowest CV (9.3%) for re-oxygenation rates. In conclusion, while the variables demonstrated CVs lower than reported changes in training-induced adaptations and/or differences between athletes and controls (23- 450%), practitioners are encouraged to consider the advantages/disadvantages of each method when performing their analysis.
authors.affiliation: School of Exercise and Health Sciences, Edith Cowan University, Perth, Australia. m.abdullah@ecu.edu.au
authors.forename: M
authors.initials: M
authors.lastname: Ihsan
authors.forename: C R
authors.initials: CR
authors.lastname: Abbiss
authors.forename: M
authors.initials: M
authors.lastname: Lipski
authors.forename: M
authors.initials: M
authors.lastname: Buchheit
authors.forename: G
authors.initials: G
authors.lastname: Watson
mesh_terms: D000328:Adult; D056352:Athletes; D001810:Blood Volume / Q000502:physiology*; D005080:Exercise Test / Q000379:methods; D006454:Hemoglobins / Q000378:metabolism; D006801:Humans; D016014:Linear Models; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology; D010100:Oxygen / Q000378:metabolism*; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D013997:Time Factors; D055815:Young Adult
chemical_list: D006454:Hemoglobins; D010100:Oxygen