title: Considerations for determining the time course of post-activation potentiation.
abstract: We sought to determine the efficacy of using a continuous time course trial to assess the temporal profile of post-activation potentiation and to determine the time course of potentiation of discrete jump squat kinetic and kinematic variables. Eight physically trained men performed jump squats before and 4, 8, and 12 min after a 5-repetition maximum back squat. Time intervals were assessed in 3 discontinuous trials (each time interval assessed in a separate trial) and in 1 continuous trial (all time intervals assessed in a single trial). Percentage differences between continuous and discontinuous trials at each time interval were mostly insubstantial. Discrete variables displayed a diverse time course (effect size: trivial to large); time to maximal values ranged between 5.00 ± 2.53 min (concentric peak force) and 9.50 ± 2.98 min (eccentric mean force). Eccentric variables (8.58 ± 3.56 min) took longer to peak than concentric variables (6.64 ± 2.93 min) (effect size: small). Individual subjects attained maximal values for kinetic and kinematic variables at different time intervals, yet the 4-min interval typically displayed the greatest magnitude and frequency of potentiation. We conclude that a continuous time course trial does not substantially influence performance of subsequent jumps and is appropriate for determining the temporal profile of potentiation, which is influenced by discrete jump squat kinetic and kinematic variables and individual differences.
authors.affiliation: a Physiology, Australian Institute of Sport, Canberra, Australia.|b School of Human Movement Studies, Charles Sturt University, Bathurst, Australia.
authors.forename: Maria L
authors.initials: ML
authors.lastname: Nibali
authors.affiliation: a Physiology, Australian Institute of Sport, Canberra, Australia.
authors.forename: Dale W
authors.initials: DW
authors.lastname: Chapman
authors.affiliation: b School of Human Movement Studies, Charles Sturt University, Bathurst, Australia.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Robergs
authors.affiliation: b School of Human Movement Studies, Charles Sturt University, Bathurst, Australia.
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Drinkwater
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D001696:Biomechanical Phenomena; D018592:Cross-Over Studies; D005080:Exercise Test; D006801:Humans; D007700:Kinetics; D008297:Male; D009119:Muscle Contraction; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000502:physiology*; D055070:Resistance Training; D055815:Young Adult
keywords: accroupissement suivi d’un saut vertical; cinétique; complex training; entraînement complexe; jump squats; kinetics; post-activation potentiation; potentialisation post-activation; power output; production de puissance