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Comparison of electromyographic activity of shoulder muscles during two different pull-up test methods
, , , , ,
Volume 10, Issue 3 (6-2012)
Abstract

Pull-up and modified pull-up tests are frequently used for shoulder muscles
endurance evaluation by physical educators. Despite of using these tests, the
difference of muscle activation pattern in pull-up and modified pull-up tests has
not been documented clearly. However, the role of some important muscles
such as anterior deltoid, posterior deltoid, trapezius and latissimus dorsi have
not yet examined during these tests. This study aimed to determine effects of
pull-up and modified pull-up tests on the EMGs recordings from selected
muscles including anterior deltoid, posterior deltoid, biceps, triceps, pectoralis
major, trapezius and latissimus dorsi. Ten able-bodied males (age: 25.32 ±
3.95 yrs; weight: 72.31 ± 7.24 kg) who were able to do at least 5 pull-ups were
selected to participate in the study. Surface electromyographic data were
recorded from selected muscles using De Luca and Basmajian’s method.
ANOVA with repeated measures was employed for comparison of
electromyographic activity in the selected muscles during pull-up and modified
pull-up tests (p  0.05). The results revealed that in modified pull-up test
anterior deltoid, posterior deltoid and trapezius muscles activation were
significantly higher in comparison with pull-up test, while the EMG activity of
biceps, triceps and pectoralis major was significantly higher in pull-up test.


Strength ratio between agonist and antagonist muscles and range of motion of the shoulder in female volleyball players and non-athletes
Mrs Safoora Heidari, Dr Ali Shamsi Majlan, Dr Hasan Daneshmandi, Dr Nahid Khoshraftar Yazdi,
Volume 15, Issue 14 (10-2017)
Abstract
Background and Purpose: Frequent throwing Movements can change its muscular strength and range of motion balance shoulder athletes compared to non-athletes. The purpose of this study was to the comparison of strength ratio between agonist and antagonist muscles and range of motion of the shoulder in volleyball players and non-athletes. Research Method: Thirty female volleyball players (mean age±SD; 21±2.58 year) and thirty non-athletes individuals (mean age ± SD; 22±1.13 years) participated in this study. Manual muscle test (MMT) and Leighton Flexometer was respectively used for measuring the strength and ROM of the participants. Demographic information was collected through questionnaires. After determining the normal data distribution independent and paired samples T-test was used to analyze them. Results: In Compare ratio of agonist to antagonist muscle strength in the dominant and non-dominant hand volleyball players (p≤0.001, p=0.002) As well as dominant hand in both groups (volleyball and control) (p≤0.001, p=0.003) in the ratio of internal to external rotation and abduction to adduction strength was significant difference (P≤0.05). A significant decrease in range of motion in internal rotation and extension movements of the dominant hand (p≤0.001, p=0.005) and a significant increase in external rotation volleyball players in dominant hand was observed (p=0.026).Conclusion: Repeated pattern of movements in the volleyball sports for a long time causes muscle imbalance in strength and range of motion shoulder joint that in case of inadequate attention and lack of proper stretching and strengthening exercises to use, this asymmetry can make athletes prone to injury his performance will decrease

Comparison of Strength Ratio and Range of Motion of the Shoulder Joint in Players with Overhead Movement
Mr Mojtaba Iranmanesh, Dr Mansour Sahebozamani, Dr Mohammadreza Amir Seifadini,
Volume 21, Issue 25 (9-2023)
Abstract
The shoulder complex as one of the most moving joints of the body frequently was used by overhead sports athletes. Thus, musculoskeletal screening such as assessment of the range of motion (ROM), and strength variables can be useful to injury prevention strategies and further the development of conditioning and rehabilitation programs. The purpose of this study is to compare selected variables and the ratio of ROM and strength in volleyball, handball, and badminton players. A total of 36 athletes with similar physical characteristics (volleyball: age=26.65±4.56 y, weight=91.07±7.91 kg, height=185.14±12.25 cm; handball: age=27.29±3.12 y, weight=90.11±6.38 kg, height=183.52±9.67 cm, and badminton: age=26.01±4.29 y, weight=87.85±4.59 kg, height=182.38±10.74 cm) were selected to participate in the current study. A Leighton flex meter and hand-held dynamometer were used respectively to measure the ratio of ROM and strength.The results showed that the mean ratio of external(ER) strength to internal (IR) strength and ER ROM to IR ROM were significantly different between the three groups. The post hoc test revealed that badminton athletes had significant differences in all of the measured variables to both volleyball and handball athletes. But there were no differences between volleyball and handball athletes.In conclusion, preseason screening is vital in achieving optimal values on these measures and may reduce future shoulder injuries in overhead athletes.

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