title: The positive effects of priming exercise on oxygen uptake kinetics and high-intensity exercise performance are not magnified by a fast-start pacing strategy in trained cyclists.
abstract: The purpose of this study was to determine both the independent and additive effects of prior heavy-intensity exercise and pacing strategies on the VO2 kinetics and performance during high-intensity exercise. Fourteen endurance cyclists (VO2max  = 62.8 ± 8.5 mL.kg-1.min-1) volunteered to participate in the present study with the following protocols: 1) incremental test to determine lactate threshold and VO2max; 2) four maximal constant-load tests to estimate critical power; 3) six bouts of exercise, using a fast-start (FS), even-start (ES) or slow-start (SS) pacing strategy, with and without a preceding heavy-intensity exercise session (i.e., 90% critical power). In all conditions, the subjects completed an all-out sprint during the final 60 s of the test as a measure of the performance. For the control condition, the mean response time was significantly shorter (p < 0.001) for FS (27 ± 4 s) than for ES (32 ± 5 s) and SS (32 ± 6 s). After the prior exercise, the mean response time was not significantly different among the paced conditions (FS = 24 ± 5 s; ES = 25 ± 5 s; SS = 26 ± 5 s). The end-sprint performance (i.e., mean power output) was only improved (∼ 3.2%, p<0.01) by prior exercise. Thus, in trained endurance cyclists, an FS pacing strategy does not magnify the positive effects of priming exercise on the overall VO2 kinetics and short-term high-intensity performance.
authors.affiliation: Human Performance Laboratory, IB - UNESP, Rio Claro, São Paulo, Brazil.
authors.forename: Renato Aparecido Corrêa
authors.initials: RA
authors.lastname: Caritá
authors.affiliation: Human Performance Laboratory, IB - UNESP, Rio Claro, São Paulo, Brazil.
authors.forename: Camila Coelho
authors.initials: CC
authors.lastname: Greco
authors.affiliation: Human Performance Laboratory, IB - UNESP, Rio Claro, São Paulo, Brazil.
authors.forename: Benedito Sérgio
authors.initials: BS
authors.lastname: Denadai
mesh_terms: D000328:Adult; D015308:Anaerobic Threshold / Q000502:physiology*; D056352:Athletes; D001642:Bicycling / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D019344:Lactic Acid / Q000378:metabolism; D008297:Male; D010100:Oxygen / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology*
chemical_list: D019344:Lactic Acid; D010100:Oxygen
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