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Medicina dello Sport 2018 March;71(1):96-106

DOI: 10.23736/S0025-7826.18.03160-5


language: English, Italian

Core muscular endurance in volleyball players with anterior shoulder instability and asymptomatic players

Shahrzad ZANDI 1, Reza RAJABI 1, Hooman MINOONEJAD 1 , Mohammadali MOHSENI-BANDPEI 2, 3

1 Department of Health and Sports Medicine, Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran; 2 Iranian Research Center on Aging, Department of Physiotherapy, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran; 3 Institute of Physical Therapy, Faculty of Allied Health Sciences, University of Lahore, Lahore, Pakistan


BACKGROUND: The overhead tasks in volleyball demand high levels of power and muscular endurance and control and this region is one of the most commonly injured and unstable sites in volleyball players. This fast shoulder movement is associated with core muscular activation. Deficiency in core strength may lead to predisposing athletes to injury. Despite the prevalence of shoulder injuries in volleyball, limited evidence investigated components of core stability in people with shoulder instability. The aim of this study was to investigate the core muscular endurance of female volleyball players with anterior shoulder instability (ASI) compared to the asymptomatic players.
METHODS: Fourteen asymptomatic female volleyball players and 14 female volleyball players with ASI performed core muscular endurance tests. Core stability was measured using three endurance tests: trunk extensor, trunk flexor and side bridge (on the dominant side of the healthy group and both sides of the ASI group).
RESULTS: No difference was found between age, weight, height and history of playing volleyball between groups (P<0.05). All core stability test outcomes showed higher outcomes in the healthy group, but this difference was only significant in flexor endurance test (92.14±9.469 vs. 114.14±12.990, t=-5.121, P=0.001) and dominant side bridge tests (62.07±6.557 vs. 76.29±5.121, t=-6.393, P=0.001). The extensor endurance test showed no difference between groups (152.79±8.10 vs. 157.00±5.818, t=-1.580, P=0.126). In side bridge test, the ASI group showed higher outcomes in non-dominant (non-injured) side (t=-12.943, df=13, P=0.001) compared to the dominant injured side (80.07±4.599 vs. 62.07±6.557).
CONCLUSIONS: Female volleyball players with ASI had less core stability compared to healthy subjects. We suggest strengthening core stabilizers in the rehabilitation of overhead athletes with ASI.

KEY WORDS: Muscle development - Muscle strength - Physical endurance - Shoulder - Joint instability - Volleyball

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