title: Postactivation Potentation Effects From Accommodating Resistance Combined With Heavy Back Squats on Short Sprint Performance.
abstract: Applying accommodating resistance combined with isoinertial resistance has been demonstrated to be effective in improving neuromuscular attributes important for sport performance. The main purpose of this study was to determine whether short sprints can be acutely enhanced after several sets of back squats with or without accommodating resistance. Twenty recreationally resistance-trained males (age: 23.3 ± 4.4 years; height: 178.9 ± 6.5 cm; weight: 88.3 ± 10.8 kg) performed pre-post testing on 9.1-m sprint time. Three different interventions were implemented in randomized order between pre-post 9.1-m sprints. On 3 separate days, subjects either sat for 5 minutes (CTRL), performed 5 sets of 3 repetitions at 85% of their 1 repetition maximum (1RM) with isoinertial load (STND), or performed 5 sets of 3 repetitions at 85% of their 1RM, with 30% of the total resistance coming from elastic band tension (BAND) between pre-post 9.1-m sprint testing. Posttesting for 9.1-m sprint time occurred immediately after the last set of squats (Post-Immediate) and on every minute for 4 minutes after the last set of squats (Post-1min, Post-2min, Post-3min, and Post-4min). Repeated-measures analysis of variance statistical analyses revealed no significant changes in sprint time across posttesting times during the CTRL and STND condition. During the BAND condition, sprint time significantly decreased from Post-Immediate to Post-4min (p = 0.002). The uniqueness of accommodating resistance could create an optimal postactivation potentiation effect to increase neuromuscular performance. Coaches and athletes can implement heavy accommodating resistance exercises to their warm-up when improving acute sprint time is desired.
authors.affiliation: 1Human Performance Laboratory, Department of Exercise and Sport Science, Concordia University, Portland, Oregon; and 2School of Physical Therapy, College of Health and Human Sciences, Northern Illinois University, DeKalb, Illinois.
authors.forename: Timothy P
authors.initials: TP
authors.lastname: Wyland
authors.forename: Joshua D
authors.initials: JD
authors.lastname: Van Dorin
authors.forename: G Francis Cisco
authors.initials: GF
authors.lastname: Reyes
mesh_terms: D054874:Athletic Performance / Q000502:physiology*; D006801:Humans; D008297:Male; D055070:Resistance Training / Q000379:methods*; D012420:Running / Q000502:physiology*; D055815:Young Adult