Wallin et al (1985) investigated the effect of 30 days of proprioceptive neuromuscular facilitation (PNF) and ballistic stretching, and 30 days of on-going PNF stretching with different stretching frequencies from one to five times a week.
1985) investigated the effect of 30 days of PNF and ballistic stretching, followed by 30 days of on-going PNF stretching alone.
2005) investigated the differences between static and PNF stretching on isokinetic leg extension in recreationally-active males and females and reported negative effects of equal magnitude from both stretching protocols.
Hence, the variables peak power, mean power, and the time to reach peak power were assessed during the Wingate test after a static stretching, dynamic stretching, PNF stretching, and a no stretching condition.
Regarding PNF stretching, the studies that investigated its effects on strength (Marek et al.
Active and PNF stretching, however, which involve progressive muscle contraction and specific patterns of movement against external loading over the full range of movement, seem to offer the most effective means of improving the full range of functional performance in sport (running) and exercise.