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Mr Ehsan Tasoujian, Mr Homman Minoonejad, Mr Mohammad Hossein Alizadeh, Mrs Shahrzad Zandi,
Volume 0, Issue 0 (11-2019)
Abstract

Purpose: Volleyball has a high potential for shoulder dyskinesia due to the repetitive nature of spike, serve and block, so the aim was to investigate electromyography analysis of shoulder girdle muscle in male volleyball players with different types of scapular dyskinesia while performing a floater serve.
Methods: The current research method is the causal-comparative type. 41 volleyball players aged 18-25 were selected non-randomly and purposefully and were divided into three groups (n=13 inferior angle of scapula prominence, n=13 medial border of scapula prominence, n=13 without scapulae dyskinesia). Electromyography of 4 muscles including serratus anterior, upper, middle, and lower trapezius in the dominant shoulder was evaluated while performing a floater serve using MyoMuscle. Data were analyzed using analysis of variance test at the significance level of 0.05.
Results:  The results showed that during the acceleration phase of the serving, there was a significant difference in EMG of the upper trapezius (p=0.009) and middle trapezius (p=0.01) between the medial border of scapula prominence group and without dyskinesia group, and there was a significant difference in EMG of serratus anterior (p=0.007) and middle trapezius (p=0.01) between the inferior angle of scapula prominence group and without dyskinesia group.
Conclusion: It seems that during the acceleration phase of the floater serve, volleyball players with medial border of scapula prominence experienced an abnormal increase in upper trapezius activity and inhibition of the middle trapezius activity, while probably volleyball players with inferior angle of scapula prominence experience inhibition the activity of the middle trapezius and serratus anterior.
N Shaterkazemi, Sh Zandi, E Shirzad,
Volume 18, Issue 19 (7-2020)
Abstract

Regarding the effects of the kinematics of the movement on athletic performance and the Importance of promoting athlete’s performance on the sport fields, there is limited knowledge about the mechanism of the effect of different variables of volleyball spike. Therefore, the aim of this study was the prediction of jump performance in elite female volleyball players with selected kinematic variables.  Thirty elite female volleyball players with mean age of 21.44±3.42 have volunteered for this study. Lower limbs kinematics have been recorded using 16 reflexive markers with Vicon motion analysis system during volleyball spike jump performance. Jump height and time of concentric phase of jump have been predicted by center of mas velocity during step, final step length and ranges of the motion of hip, knee and ankle with stepwise regression (α≤0.05). The results showed that knee range of motion center of mass velocity and step length could be the predictors for time of jump and center of mass velocity and hip range of motion could be the predictors for the jump height as well. Considering these results and the goal and situation of the volleyball match, the players should focus on different phases and affecting variables of the spike jump.
 


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