title: Volume, intensity, and timing of muscle power potentiation are variable.
abstract: Whereas muscle potentiation is consistently demonstrated with evoked contractile properties, the potentiation of functional and physiological measures is inconsistent. The objective was to compare a variety of conditioning stimuli volumes and intensities over a 15-min recovery period. Twelve volleyball players were subjected to conditioning stimuli that included 10 repetitions of half squats with 70% of 1-repetition maximum (RM) (10 × 70), 5 × 70, 5 × 85, 3 × 85, 3 × 90, 1 × 90, and control. Jump height, power, velocity, and force were measured at baseline, 1, 3, 5, 10, and 15 min. Data were analysed with a 2-way repeated measure ANOVA and magnitude-based inferences. The ANOVA indicated significant decreases in jump height, power, and velocity during recovery. This should not be interpreted that no potentiation occurred. Each dependent variable reached a peak at a slightly different time: peak jump height (2.8 ± 2.3 min), mean power (3.6 ± 3.01 min), peak power (2.5 ± 1.8 min), and peak velocity (2.5 ± 1.8 min). Magnitude-based inference revealed that both the 5 × 70 and 3 × 85 protocol elicited changes that exceeded 75% likelihood of exceeding the smallest worthwhile change (SWC) for peak power and velocity. The 10 × 70 and the 5 × 70 had a substantial likelihood of potentiating peak velocity and mean power above the SWC, respectively. Magnitude-based inferences revealed that while no protocol had a substantial likelihood of potentiating the peak vertical jump, the 5 × 70 had the most consistent substantial likelihood of increasing the peak of most dependent variables. We were unable to consistently predict if these peaks occurred at 1, 3, or 5 min poststimulation, though declines after 5 min seems probable.
authors: National Center of Medicine and Science in Sports, Tunis, Tunisia.
authors: Anis
authors: A
authors: Chaouachi
authors: Nick
authors: N
authors: Poulos
authors: Fathi
authors: F
authors: Abed
authors: Olfa
authors: O
authors: Turki
authors: Matt
authors: M
authors: Brughelli
authors: Karim
authors: K
authors: Chamari
authors: Eric J
authors: EJ
authors: Drinkwater
authors: David G
authors: DG
authors: Behm
mesh_terms: D000328:Adult; D056352:Athletes; D054874:Athletic Performance; D005080:Exercise Test; D006801:Humans; D008297:Male; D009119:Muscle Contraction; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000033:anatomy & histology* / Q000502:physiology*; D010809:Physical Fitness; D015203:Reproducibility of Results; D013997:Time Factors; D054798:Volleyball; D055815:Young Adult