The Effect of an Acute PNF Stretching on the Rate of Force Development of Hamstring and Quadriceps Muscles among Athletes with Dynamic Knee Valgus

Subject Areas : sports Biomechanics

Fatemeh Alizadeh ¹ , Parastoo ShamsehKohan ²

1 - Department of Sport Injury and Corrective Exercises, Faculty of Physical Education and Sport Science, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran.
2 - Assistant Professor, School of Physical Education and Sport Science, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

Received: 2024-02-06 Accepted : 2024-02-09 Published : 2024-02-12

Keywords: Hamstring muscle, Quadriceps muscle, PNF stretching, Rate of force development, Dynamic knee valgus,

Abstract :

Introduction: PNF stretching is used to improve maximum muscle function, reduce muscle damage, reduce muscle stiffness and increase joint mobility before exercise. As a result, the aim of this research was to investigate the effect of an acute PNF stretching on the rate of force development of hamstring and quadriceps muscles among athletes with dynamic knee valgus. Methods: The samples of the present study included 12 young female athletes who were selected through available and targeted sampling and all of them had dynamic knee valgus. Subjects performed PNF stretching for the target muscle and then were placed on the force plate for relevant analysis. Their rate of force development was evaluated according to the established protocols. Since the investigation of the acute effect of stretching was desired by the researcher, PNF stretching process was performed for the target muscle before each test. Analysis of variance with repeated measurements was used for statistical analysis of the data by SPSS 24. Results: There is no statistically significant difference in the rate of force development of hamstring muscle after stretching between agonist and antagonist muscles (0.229). Although according to the results of this section, it can be stated that an acute PNF stretching has a significant effect on the rate of force development of hamstring muscle in athletes with dynamic knee valgus (0.017 and 0.016). Conclusion: According to the results of the present research, it can be said that for athletes with dynamic knee valgus, acute PNF stretching can be used to improve the rate of force development of hamstring muscle.

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