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Background and Objective: Proprioception an important role in shoulder joint function. Exercise and throat of the upper extremity are complex and skinny movements that apply a great deal of stress on the shoulder joint. This study was done to evaluate the relationship between proprioception and rotator muscles strength in dominant and non-dominant side with shoulder pain of wheelchair basketball athletes.
Methods: In this descriptive-analytic study, 50 wheelchair basketball athletes were selected in non-random sampling way from wheelchair basketball gyms from Alborz and Tehran in Iran. WUSPI, MMT system and repositioning error test with felexometere were used for assessment of shoulder pain, rotator muscles strength and proprioception respectively.
Results: There was a significant difference between dominant and non-dominant side rotators strength and proprioception (P<0.05). There was a significant relationship between internal rotators strength and proprioception in dominate side with shoulder pain (P<0.05). There was not a significant relationship between external rotators strength and proprioception in non-dominate side with shoulder pain.
Conclusion: Repeated pattern of movements in the wheelchair basketball athletes at the long time causes muscle imbalance in strength shoulder joint. It is known as a risk factor in shoulder injuries.

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Background and Objective: Stiffness and restricted range of movement (ROM) affect muscle balance and body alignment. The purpose of this research is the study the relationship between Iliopsoas tightness and hip active range of motion, extensor-flexor muscle strength and thoracolumbar curves.
Methods: This case-control study was carried out on 15 adolescent's male soccer players with short length of Iliopsoas muscle as case group and 15 healthy adolescents witch matched based on age, height, weight, BMI, dominant leg and sport experience as control group. The range of motion was measured with universal goniometer, kyphosis and lordosis with flexible ruler and muscle strength with manual dynamometer.
Results: The range of motion of the hip extension and the strength of the Iliopsoas muscle in the case group were statistically lower than the control group (P<0.05). The rate of lumbar lordosis and the ratio of gluteus maximus to the strength of the Iliopsoas muscle in the case group were significantly higher than the control group (P<0.05). There was no statistically significant difference between the range of motion of hip flexion, dyspnea kyphosis, and gluteus maximus muscle strength in the studied groups.
Conclusion: Adolescents with Iliopsoas tightness have limited hip extension and greater lumbar lordosis and weaker Iliopsoas strength in comparison to healthy counterparts.