Abstract
Objective: This study aims at analysing the relationship between isokinetic leg strength and dynamic balance performances of MSK Urfa male volleyball players that play in Turkey Volleyball League of Swashbucklers.Materials and Methods: 13 voluntary volleyball players that played in MSK Urfa being a team in League of Swashbucklers in 2016-2017 season participated in the study. Bioelectric Impedance Measurement Device (Tanita MC 180) was used to measure body composition of volleyball players. Isokinetic dynamometer (IsoMed 2000 GmbH, Germany) was used to measure their isokinetic leg strength. Tecnobody Prokin device was used to measure their dynamic balance performance. The relationship between isokinetic leg strength and dynamic balance performance was determined by Spearman correlation analysis and the significance level was accepted as p <0.05.Findings: According to the data obtained from the study, there was no statistically significant relationship between the dynamic balance performance of volleyball players and the bilateral differences of quadriceps and hamstring muscles at the angular velocity of 60°/s (p>0,05); but there was statistically significant relationship between the bilateral differences of quadriceps and hamstring muscles at the angular velocity of 120°/s (p<0,05).There was no statistically significant relationship between dynamic balance performance and Hamstring/Quadriceps (H/Q) force ratio of dominant and non-dominant leg at angular velocity of 60°/s and 120°/s (p> 0.05).As a result; it was observed that the bilateral differences of hamstring and quadriceps muscles of volleyball players at 120°/s velocity affected their dynamic balance performance; but H/Q ratio at 60°/s and 120°/s velocity did not affect their dynamic balance performance.
Highlights
IntroductionVolleyball is a branch that includes in spike, block, spike serve and coverage actions, is played in high intensity in a short span of time, and requires maintaining body balance as well as strong arms and leg
Volleyball is a branch that includes in spike, block, spike serve and coverage actions, is played in high intensity in a short span of time, and requires maintaining body balance as well as strong arms and leg.Volleyball players need to gain strength and maintain it to perform successfully
According to the data obtained from the study, there was no statistically significant relationship between the dynamic balance performance of volleyball players and the bilateral differences of quadriceps and hamstring muscles at the angular velocity of 60°/s (p>0,05); but there was statistically significant relationship between the bilateral differences of quadriceps and hamstring muscles at the angular velocity of 120°/s (p 0.05)
Summary
Volleyball is a branch that includes in spike, block, spike serve and coverage actions, is played in high intensity in a short span of time, and requires maintaining body balance as well as strong arms and leg. Volleyball players need to gain strength and maintain it to perform successfully They need to provide the control of the body in a proper mechanic while falling down after the spike and block; in other words, they need to have balance control, as well as maintaining the power gained (Sayers, 2000). It was determined that strength, flexibility and plyometric studies in which balance exercises constitute joint component lead to decrease in knee injuries by 72% for volleyball, basketball and football players (Hewett et al, 1999). There are some studies reporting a close relationship between balance and force development in the literature (Soyuer et al, 2006; Mohammadi et al, 2012; Moraru et al 2014; Çelenk et al 2015; Bulgay and Polat 2017)
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