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A comparative study of shoulder muscle strength, sense of proprioception and internal/external rotation flexibility between adolescent athletes with and without scapular asymmetry

100%

Akınoğlu B., Kabak B., Balci A., Kocahan T., Hasanoğlu A.

2020

vol. 34

issue 3

1-7

Introduction Scapular asymmetry may affect the biomechanics of the shoulder girdle joints and muscles by changing the contraction angles of the muscles. The purpose of this prospective cohort, matched-controlled study was to compare shoulder muscle strength, proprioception sense and internal/external rotation flexibility between adolescent athletes with and without scapular asymmetry.   Material and methods Nineteen athletes of tennis, fencing, shooting, archery, gymnastics, and badminton branches with left side (non-dominant) scapular asymmetry were included in the study as asymmetry group. Nineteen athletes who have similar gender, sports branch, professional experience, physical characteristics with asymmetry group were included in the study as the control group. Scapular asymmetry was measured using a tape measure with the Lateral Scapular Slide Test. Shoulder horizontal abduction/adduction isokinetic muscle strength and shoulder abduction/adduction isometric muscle strength was tested by an isokinetic dynamometer. The proprioception sense of the glenohumeral joint was evaluated with a digital inclinometer, and the flexibility of the internal and external rotation of the shoulder was evaluated by the flexibility test.   Results There was not any significant difference between the groups in isokinetic muscle strength, isometric muscle strength, and proprioception sense of shoulder (p>0.05). Shoulder internal rotation flexibility of both dominant and non-dominant sides was higher in the asymmetry group than the control group (p<0.05).   Conclusions It was determined that the flexibility of shoulder internal rotation in adolescent athletes with scapular asymmetry was higher than those without asymmetry.

Investigation of knee flexor and extensor muscle strength in athletes with and without trunk muscle strength asymmetry

100%

Balci A., Ünüvar E., Akınoğlu B., Kocahan T., Hasanoğlu A.

2021

vol. 35

issue 1

1-8

Introduction Lower extremity injuries may be associated with proximal muscle weakness and decreased motor control. Our study aims to examine knee flexor and extensor muscle strength in athletes with and without trunk muscle strength asymmetry. Material and methods This matching control study involved a total of 80 athletes; 40 athletes with asymmetrical trunk muscle strength(asymmetric group) and 40 athletes with symmetrical trunk muscle strength(symmetrical group). Strength measurements of trunk and knee muscles were made with the IsoMed 2000 isokinetic device. Independent Samples T-Test or Mann Whitney-U test was used to compare variables according to their distribution status. The statistical error level was determined as p<0.05. Results In the symmetric group, the isokinetic muscle strength of the trunk flexor muscles was stronger than the asymmetric group (p<0.05) and the trunk extensor muscles were weaker than the asymmetric group (p 0.05). The Limb Symmetry Index(LSI) value of the two groups at 60°/sec was significantly different (p=0.032), and the dominant side in the symmetric group and the non-dominant side in the asymmetric group were stronger than the other side. Conclusions This result may be associated with knee joint injuries which are common in athletes with weak muscle strength, and can be attributed to the literature knowledge that core muscle weakness may increase the frequency of knee injury. Therefore, symmetrical core strengthening training can prevent possible injuries of athletes with asymmetrical trunk muscle strength. However, we think that more studies are needed to reveal this relationship.

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2 Advances in Rehabilitation

1 2021

1 2020

2 Akınoğlu B.

2 Balci A.

2 Hasanoğlu A.

2 Kocahan T.

1 Kabak B.

1 Ünüvar E.

Search results

A comparative study of shoulder muscle strength, sense of proprioception and internal/external rotation flexibility between adolescent athletes with and without scapular asymmetry

Investigation of knee flexor and extensor muscle strength in athletes with and without trunk muscle strength asymmetry