title: Effects of a short proprioceptive neuromuscular facilitation stretching bout on quadriceps neuromuscular function, flexibility, and vertical jump performance.
abstract: The inclusion of relatively long bouts of stretching (repeated static stretches of ∼30 seconds) in the warm-up is usually associated with a drop in muscle performance. The purpose of this study was to assess the effect of a novel self-administered proprioceptive neuromuscular facilitation (PNF) paradigm with short periods of stretching and contraction on quadriceps neuromuscular function, vertical jump performance, and articular range of motion (ROM). Twelve healthy men (age: 27.7 ± 7.3 years, height: 178.4 ± 10.4 cm, weight: 73.8 ± 16.9 kg) volunteered to participate in a PNF session and a control session separated by 2-7 days. The PNF stretching lasted 2 minutes and consisted of 4 sets of 5-second isometric hamstring contraction immediately followed by 5 seconds of passive static stretch of the quadriceps immediately followed by 5 seconds isometric quadriceps contraction for each leg. For the control session, the participants were asked to walk at a comfortable speed for 2 minutes. Active ROM of knee flexion, vertical jump performance, and quadriceps neuromuscular function were tested before, immediately after, and 15 minutes after the intervention. The PNF stretching procedure did not affect ROM, squat jump, and countermovement jump performances. Accordingly, we did not observe any change in maximal voluntary contraction force, voluntary activation level, M-wave and twitch contractile properties that could be attributed to PNF stretching. The present self-administered PNF stretching of the quadriceps with short (5-second) stretches is not recommended before sports where flexibility is mandatory for performance.
authors.affiliation: Institute of Movement Sciences and Sport Medicine, Medicine Faculty, Geneva University, Geneva, Switzerland. nicolas.place@unige.ch
authors.forename: Nicolas
authors.initials: N
authors.lastname: Place
authors.forename: Yannick
authors.initials: Y
authors.lastname: Blum
authors.forename: Stéphane
authors.initials: S
authors.lastname: Armand
authors.forename: Nicola A
authors.initials: NA
authors.lastname: Maffiuletti
authors.forename: David G
authors.initials: DG
authors.lastname: Behm
mesh_terms: D000328:Adult; D018592:Cross-Over Studies; D004558:Electric Stimulation; D004576:Electromyography; D016552:Ergometry; D006801:Humans; D008297:Male; D009068:Movement; D009119:Muscle Contraction; D052580:Muscle Stretching Exercises; D009469:Neuromuscular Junction / Q000502:physiology*; D052097:Quadriceps Muscle / Q000502:physiology*; D016059:Range of Motion, Articular; D013647:Task Performance and Analysis; D016138:Walking / Q000502:physiology; D055815:Young Adult