title: Effect of a previous sprint on the parameters of the work-time to exhaustion relationship in high intensity cycling.
abstract: The relationships between both metabolic (E) and mechanical (W) energy expended and exhaustion time (t(e)), was determined for 11 well-trained subjects during constant load cycloergometric exercises at 95, 100, 110, 115 % maximal aerobic power performed both from rest and, without interruption, after an all-out sprint of 7 s. These relationships were well described by straight lines: y = a + bt(e), where b was taken as the critical power (metabolic and mechanical) that can be sustained for long periods of time. b was unaffected by the exercise conditions and amounted to 82 - 94 % of maximal aerobic metabolic and mechanical power. The constant a was taken as the anaerobic stores capacity in excess of the O2 deficit. When the test was preceded by the sprint, a (metabolic and mechanical) was reduced to about 60 - 70 % of control values. This reduction was essentially equal to the corresponding E and W output during the sprint. These data support the view that the slope of linear regressions of E and W on t(e) is indeed a measure of the critical power, whereas the y intercept of these same regressions is a measure of the anaerobic capacity.
authors.affiliation: Centre de médecine du sport CCAS, Paris, France. r_heubert@yahoo.fr
authors.forename: R A P
authors.initials: RA
authors.lastname: Heubert
authors.forename: V L
authors.initials: VL
authors.lastname: Billat
authors.forename: P
authors.initials: P
authors.lastname: Chassaing
authors.forename: V
authors.initials: V
authors.lastname: Bocquet
authors.forename: R H
authors.initials: RH
authors.lastname: Morton
authors.forename: J P
authors.initials: JP
authors.lastname: Koralsztein
authors.forename: P E
authors.initials: PE
authors.lastname: di Prampero
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000379:methods*; D017079:Exercise Tolerance / Q000502:physiology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D012146:Rest / Q000502:physiology; D012420:Running / Q000502:physiology*
chemical_list: D019344:Lactic Acid