title: Muscle metabolism during 30, 60 and 90 s of maximal cycling on an air-braked ergometer.
abstract: This study examined the anaerobic and aerobic contributions to muscle metabolism during high intensity short duration exercise. Six males [mean (SD): age 25.0 (6.0) years, height 179.0 (8.2) cm, mass 70.01 (7.42) kg, VO2max 4.63 (0.53) l.min-1, body fat 12.7 (2.3)%] performed three counterbalanced treatments of 30, 60 and 90 s of maximal cycling on an air-braked ergometer. All treatments were also performed on days when biopsies were not taken from the vastus lateralis muscle and cannulae not inserted into a forearm vein to ascertain whether these procedures adversely affected performance. The mean results can be summarised as follows: (Table: see text). The muscle lactate and O2 deficit data suggested that 60 and 90 s were more appropriate durations than 30 s for assessing the anaerobic capacity on an air-braked cycle ergometer. The mean power outputs also indicated that the invasive procedures did not adversely affect performance [corrected].
authors.affiliation: Exercise Physiology Laboratory, School of Education, Flinders University of South Australia, Bedford Park.
authors.forename: R T
authors.initials: RT
authors.lastname: Withers
authors.forename: W M
authors.initials: WM
authors.lastname: Sherman
authors.forename: D G
authors.initials: DG
authors.lastname: Clark
authors.forename: P C
authors.initials: PC
authors.lastname: Esselbach
authors.forename: S R
authors.initials: SR
authors.lastname: Nolan
authors.forename: M H
authors.initials: MH
authors.lastname: Mackay
authors.forename: M
authors.initials: M
authors.lastname: Brinkman
mesh_terms: D000255:Adenosine Triphosphate / Q000032:analysis; D000328:Adult; D001706:Biopsy; D005080:Exercise Test / Q000379:methods*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007773:Lactates / Q000097:blood; D008297:Male; D009132:Muscles / Q000737:chemistry / Q000378:metabolism* / Q000473:pathology; D010100:Oxygen / Q000032:analysis; D010101:Oxygen Consumption / Q000502:physiology; D011773:Pyruvates / Q000097:blood; D013997:Time Factors
chemical_list: D007773:Lactates; D011773:Pyruvates; D000255:Adenosine Triphosphate; D010100:Oxygen