Isokinetic concentric shoulder muscles strength profile in recreational weight lifters / Marwa Yehia Sayed Ebrahim ; Supervised Osama Ragaa Abdelraouf , Soheir Mohamed Abdelrahman , Ahmed Salama Yamani

Thesis (M.Sc.) - Cairo University - Faculty of Physical Therapy - Department of Biomechanics

Background: Recreational weight lifting is one of the most popular outdoor activities among young adults. Yet, there is a deficiency in research concerning its effects on shoulder muscle groups{u2019} strength and on normal agonist/antagonist ratios. Purpose: The purpose of this study was to investigate the isokinetic concentric shoulder muscles strength values and the related agonist/antagonist ratios in the recreational weight lifters as compared to those of the non-lifters. Methods: Thirty-four men (16 recreational weight lifters and 18 non-lifters) with mean age 21.09 ± 2.66 years, weight 78.50 ± 15.09 kg, and height 168.78 ± 28.68 cm participated in this study. Concentric peak torques of shoulder flexors, extensors, abductors, adductors, internal rotators and external rotators and agonist/antagonist ratios were collected at 120{u00B0}/sec using the Biodex isokinetic dynamometer. Results: Statistical analyses using one way MANOVA revealed that all mean body weight adjusted strength values were significantly greater in recreational weight trainees compared with controls (p<0.05). Strength ratios were significantly lower in recreational weight trainees compared with controls except for flexors/extensors ratio (p<0.05). Conclusion: These results suggested that recreational weight exercises place trainees at risk for muscle imbalances. Thus, training pattern must be reviewed for strength balance to prevent injuries

Issued also as CD