Effect of two static stretch and proprioceptive neuromuscular facilitation (PNF) by Hold-relaxing (H-R) within the duration of 10 and 15 second on flexibility of the calf muscle and the increase In th

This research is aimed show the effect of two static stretch and proprioceptive neuromuscular facilitation (PNF) by hold-relaxing (H-R) within the duration of 10 and 15 second on flexibility of the calf muscle and the increase in the extent in ankle range of motion. This research is of the type of semi-experimental and has been done on the boy collage students of takestan Islamic Azad University which have selected the general course of physical education within the years between 2006-2007. Fifty –five of the abovementioned students having the ages between (19-23) were purposely selected as the samples of the research. The measurement instrument of this research include: medical scale with zemic mark, made in chine, set square meter made by South Korea and body mass index. The unique characteristic of this research is that it is done on the stretch calf muscle for the first time throughout our country. the results show that in general, there is a meaningful difference between the effect of static stretch and proprioceptive neuromuscular facilitation (PNF)by hold-relaxing(H-R)method within the duration of 10 and 15 second on flexibility of the calf muscle and the increase in the extent in ankle range of motion in all age calf muscle and the increase in extent in ankle range of motion in all age groups.