title: Can Pacing Be Regulated by Post-Activation Potentiation? Insights from a Self-Paced 30 km Trial in Half-Marathon Runners.
abstract: OBJECTIVE
  Given the co-existence of post-activation potentiation (PAP) and fatigue within muscle, it is not known whether PAP could influence performance and pacing during distance running by moderating fatigue. The aim of this study was to assess the influence of PAP on pacing, jumping and other physiological measures during a self-paced 30 km trial.
  
  
  METHODS
  Eleven male endurance-trained runners (half-marathon runners) volunteered to participate in this study. Runners participated in a multi-stage 30 km trial. Before the trial started, determination of baseline blood lactate (bLa) and countermovement jump (CMJ) height was performed. The self-paced 30 km trial consisted of 6 × 5 km splits. At the end of each 5 km split (60 s break), data on time to complete the split, CMJ height, Rating of Perceived Exertion (RPE) and blood lactate were collected while heart rate was continuously monitored.
  
  
  RESULTS
  There was a significant decrease in speed (e.g. positive pacing strategy after the 4th split, p<0.05) with a progressive increase in RPE throughout the trial. Compared with baseline, CMJ height was significantly (p<0.05) greater than baseline and was maintained until the end of the trial with an increase after the 5th split, concomitant with a significant reduction in speed and an increase in RPE. Significant correlations were found between ΔCMJ and ΔSPEED (r = 0.77 to 0.87, p<0.05) at different time points as well as between RPE and speed (r = -0.61 to -0.82, p<0.05).
  
  
  CONCLUSIONS
  Our results indicates that fatigue and potentiation co-exist during long lasting endurance events, and that the observed increase in jump performance towards the end of the trial could be reflecting a greater potentiation potentially perhaps counteracting the effects of fatigue and preventing further reductions in speed.
authors.affiliation: Grupo de Investigación en Estilos de Vida y Estrés Oxidativo, CenIHN - Escuela de Nutrición, DAAN, Hospital Nacional de Clínicas, Facultad de Cs. Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina.|Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil.
authors.forename: Sebastián
authors.initials: S
authors.lastname: Del Rosso
authors.affiliation: Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil.
authors.forename: Edilberto
authors.initials: E
authors.lastname: Barros
authors.affiliation: Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil.
authors.forename: Laís
authors.initials: L
authors.lastname: Tonello
authors.affiliation: Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil.
authors.forename: Iransé
authors.initials: I
authors.lastname: Oliveira-Silva
authors.affiliation: School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland, Canada.
authors.forename: David G
authors.initials: DG
authors.lastname: Behm
authors.affiliation: Department of Exercise and Sport Science, University of Wisconsin, La Crosse, Wisconsin, United States of America.
authors.forename: Carl
authors.initials: C
authors.lastname: Foster
authors.affiliation: Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Boullosa
mesh_terms: D000328:Adult; D054874:Athletic Performance; D006339:Heart Rate; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D018763:Muscle Fatigue; D010465:Perception; D010807:Physical Endurance; D012420:Running; D055815:Young Adult
chemical_list: D019344:Lactic Acid