[Home ] [Archive]   [ فارسی ]  
:: Main :: About :: Current Issue :: Archive :: Search :: Submit :: Contact ::
:: Volume 1, Number 1 (9-2015) ::
J Sport Biomech 2015, 1(1): 45-51 Back to browse issues page
The Effect of Ratio of Contraction to Relaxation Durations in PNF Exercises on the Muscle Strength and Range of Motion of Hip Joint
Hossein Rashedi *, Amir Ali Jafarnezhadgero, Naser Farokhroo
Department of Physical Education and Sport Sciences, Faculty of Humanities, Islamic Azad University, Hamedan branch, Hamedan, Iran.
Abstract:   (1234 Views)

Objective: The aim of the present study was to compare the effect of ratios of contraction- Relaxation on the muscle strength and range of motion of hip joint in PNF exercises.

Methods: Thirty nine nonathletic male students (Mean±SD; age, 13±1.2 years; body mass, 55±9.8 kg) were assigned .Three groups designated as I, II and III groups. The ratios of contraction to relaxation periods for groups were 1, 2 and 3 respectively. Training program included three sessions per week (CR-PNF) for 6 weeks. Measurements of hip extensors muscles stretch and strength were performed at the beginning and at the end of training using an inclinometer (during leg raise test) and dynamometer. Data were analyzed using dependent samples t-test and one-way ANOVA.

Results: The results of the present study showed significant increases in hip extensor muscles flexibility and strength for three groups. This increase the in the strength in group I equaled 6 kg, in group II 4 kg and in group III 7 kg. The amount of increase in the hip extensor muscles flexibility in group I, II and II were 15, 8 and 12 degrees, respectively.  The increase in these two variables was significant and similar in all three groups.

Conclusion: Different contraction to relaxation ratio normally, 0.5, 1 and 2, did not show any meaningful differences on hip extensor muscular strength and hip range of motion.

Keywords: PNF training, Ratio of contraction to relaxation durations, Strength, Flexibility
Full-Text [PDF 326 kb]   (549 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/05/12 | Accepted: 2015/09/15 | Published: 2016/09/17
Send email to the article author

Add your comments about this article
Your username or email:

Write the security code in the box >



XML   Persian Abstract   Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Rashedi H, Jafarnezhadgero A A, Farokhroo N. The Effect of Ratio of Contraction to Relaxation Durations in PNF Exercises on the Muscle Strength and Range of Motion of Hip Joint. J Sport Biomech. 2015; 1 (1) :45-51
URL: http://biomechanics.iauh.ac.ir/article-1-107-en.html
Volume 1, Number 1 (9-2015) Back to browse issues page
فصلنامه بیومکانیک ورزشی Journal of Sport Biomechanics
Persian site map - English site map - Created in 0.049 seconds with 792 queries by yektaweb 3465