title: Acute effect of proprioceptive neuromuscular facilitation stretching on the number of repetitions performed during a multiple set resistance exercise protocol.
abstract: It has been proposed that fatigue during strength exercise is negatively influenced by prior proprioceptive neuromuscular facilitation (PNF) stretching. However, it is possible that the effects of PNF on muscle endurance are affected by stretching duration. This study investigated the influence of PNF on the number of repetitions of the leg curl exercise performed with multiple sets and submaximal load. Nineteen men (age 25 ± 1 years, weight 75.8 ± 4.2 kg, height 178.1 ± 3.8 cm, 10-repetition maximum [RM] 78.3 ± 6.9 kg) performed 4 sets of leg curl with 10RM load with and without previous PNF (3 sets of hip flexion either with knees extended or flexed, duration ~2.5 minutes). The total number of repetitions decreased along sets in both situations (38.6% in control and 41.0% in PNF sessions, p < 0.001). However, no difference between control and PNF was detected for the number of repetitions in each set (first set, p = 0.330; second set, p = 0.072; third set, p = 0.061; fourth set, p = 0.150). In conclusion, the number of repetitions performed in multiple sets of the leg curl was not decreased by prior PNF stretching. Therefore, it appears that a moderate level of PNF could be used before resistance exercise with a minimal negative effect.
authors: 1Graduate Program on Physical Activity Sciences, Salgado de Oliveira University, Niterói, Brazil; 2Laboratory of Physical Activity and Health Promotion, Rio de Janeiro State University, Rio de Janeiro, Brazil; and 3Physical Education and Sports Faculty, Federal University of Juiz de Fora, Juiz de Fora, Brazil.
authors: Felipe
authors: F
authors: Keese
authors: Paulo
authors: P
authors: Farinatti
authors: Renato
authors: R
authors: Massaferri
authors: Lenifran
authors: L
authors: Matos-Santos
authors: Nadia
authors: N
authors: Silva
authors: Walace
authors: W
authors: Monteiro
mesh_terms: D000328:Adult; D006801:Humans; D035002:Lower Extremity / Q000502:physiology; D008297:Male; D018763:Muscle Fatigue; D052580:Muscle Stretching Exercises; D018482:Muscle, Skeletal / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D011434:Proprioception; D055070:Resistance Training; D014891:Weight Lifting / Q000502:physiology; D055815:Young Adult