"تأثير تطوير المرونة باستعمال طريقتيPNF و STعلى القوة الانفجارية والسرعة لدى لاعبات الكرة الطائرة للسن ( 14 ـ 18)"

Abstract

The aim of this study is to understand the effects of the proposed training program based on the PNF and ST method in the development of flexibility , strength and speed. The sample was composed of 16 female volleyball players, ( age 14.67± 0.87 years , height 1.62 ± 0.06 m , weight 51.38 ± 6.12 kg) , we divided the sample into two experimental groups : the first experimental group ( n=8 ) for the PNF method ( age 14.75 ± 0.97 years, height 1.62± 0.06m , weight 52.03± 4.97kg), while the second group experimental study (n =7) concerns the ST method ( age 14.57 ± 0.73 years , height 1.62 ± 0.07 m , weight 50.64 ± 7.15 kg) . The sample members were subjected to a pre and post test by applying 7 physical tests (flexibility by using: sit and reach, the shoulder lift test, strength using:sargent test , medicine ball launch test and speed using : 10 m , 20 m , 30m ). After six weeks of training program, we obtain the following results:

-An improvement in the flexibility of the lower and upper limbs, 10m speed , the explosive strength of the lower limbs and in anaerobic alacticpower in the PNF group,with statistical signification at P< 0.001, P < 0.01, P<0.05, P< 0.01 and P<0.001 consecutively. In ST group there is also an improvement in the flexibility of the lower and upper limbs, the explosive strength of the lower limbs and in anaerobic alacticpower all with the samestatisticalsignification at P < 0.01. On the other hand, when we compare PNF vs ST groups, we found significant differences in post test in: speed 20m and 30m, strength test of the upper limbs, the flexibility of the lower limbs all in favour of PNF group, with statistical signification at P< 0.05, P<0.01, P< 0.05 et P< 0.05.

Conclusion : the PNF method is more efficient than ST(statique) method in an improvement of explosive power and speed. So, volleyball coaches need to focus more on the quality of flexibility to improve the players physical performance and especially explosiveness.