Browsing by Author "Sahan, C"
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Item Isokinetic Strength Responses to Season-long Training and Competition in Turkish Elite Soccer PlayersEniseler, N; Sahan, C; Vurgun, H; Mavi, HFThere are not enough studies that describe the isokinetic strength of professional soccer players at high angular velocities. The purpose of this study was to evaluate the seasonal changes in isokinetic strength of Turkish professional soccer players (n=14) over the course of a 24-week soccer season. The isokinetic strength of players who underwent usual soccer training and weekly competition throughout the soccer season was assessed by means of the Biodex System 3 dynamometer with the knee attachment. The peak torque of knee extensor and flexor muscles were measured at angular velocities of 60 degrees/s, 300 degrees/s and 500 degrees/s. Players were tested at the beginning and end of the competitive season. While the first- and second-test measurements did not show significant changes at 60 degrees/s and 300 degrees/s angular velocities, at the end of the training period, players' knee strength changed significantly at 500 degrees/s angular velocities. In addition, the H/Q ratio improved significantly for the dominant as well as non-dominant leg at 500 degrees/s. Significant bilateral strength improvements for knee flexors were also observed at 500 degrees/s. The findings of this study suggest that usual daily soccer training (technical, tactical, power, strength, endurance, flexibility, etc.) and weekly competition might produce changes in knee strength at high angular velocities.Item Association between the ACE I/D gene polymorphism and physical performance in a homogeneous non-elite cohortCam, FS; Colakoglu, M; Sekuri, C; Colakoglu, S; Sahan, C; Berdeli, ABackground: I/D polymorphism of the ACE gene may be associated with better endurance performance and a stronger response to exercise training. The aim of this study was to investigate the association between ACE gene polymorphism and athletic performance in a homogeneous cohort. Methods: Eighty-eight male non-elite Caucasian Turkish athletes with similar training backgrounds for at least for 6 months were studied for ACE gene polymorphisms by PCR analysis. Performance on the 60-meter sprint and middle-distance running tests were evaluated. Results: The distributions of the ACE I/D genotypes were 20.5%, 40.9%, and 38.6%for II, ID, and DD polymorphisms in the whole group (N = 88), respectively. The ACE DD genotype frequency was significantly higher in the superior group (56.7%) than in the poor (37.9%) and mediocre (20.7%) group in middle-distance running performance (X-2 = 11.778; p = 0.019). Conclusion: The ACE DD genotype may be related to better short-duration aerobic endurance performance. Larger homogeneous cohorts may help clarify the association between ACE I/D polymorphism and physical performance.Item A novel version of Copenhagen Psychosocial Questionnaire-3: Turkish validation studySahan, C; Baydur, H; Demiral, YPurpose: The aim of the study was to adapt the Copenhagen Psychosocial Questionnaire Version-3 (COPSOQ-3) into the Turkish language. Methods: This is a methodologic study. The field study occurred in four workplaces (call center, hospital, plastic and metal industries). The Kaiser-Meyer-Olkin (KMO) Measure of Sampling Adequacy and Bartlett's Test of Sphericity were used to assess the suitability of the sample for factor analysis. The principal component analysis and varimax rotation methods were used to identify the factor structure.The internal consistency was assessed using the Cronbach's alpha coefficient. Results: In total, 1076 respondents' questionnaires were evaluated. Fifty-eight percent of the participants were men and the mean age was 31.1???7.7. Sampling adequacy was considered adequate (KMO =0.929). The factor analysis of the Turkish COPSOQ (COPSOQ-TR) identified 19 factors with eigenvalues higher than one and explained 66.1% of the total variance. The Cronbach's alpha values of 23 dimensions were over 0.70. The Cronbach's alpha values of control over working time and predictability were 0.54 and 0.66, respectively. The model was an excellent fit (Chi-Square?=?8514.5, x(2)/df?=?2.48, RMSEA?=?0.038, SRMR?=?0.053, CFI?=?0.98). Conclusions: Findings show that COPSOQ-TR is a reliable and valid instrument that can be a useful tool to measure psychosocial risks in the Turkish language.Item High-Intensity Small-Sided Games versus Repeated Sprint Training in Junior Soccer PlayersEniseler, N; Sahan, C; Özcan, I; Dinler, KThe aim of this study was to compare the effects of high-intensity small-sided games training (SSGT) versus repeated-sprint training (RST) on repeated-sprint ability (RSA), soccer specific endurance performance and short passing ability among junior soccer players. The junior soccer players were recruited from of a professional team (age 16.9 +/- 1.1 years). The tests included the repeated-shuttle-sprint ability test (RSSAT), Yo-Yo Intermittent Recovery Test level 1 (Yo-Yo IR1) and Loughborough Soccer Passing Test (LSPT). Nineteen participants were randomly assigned to either the small-sided games training (SSGTG) (n = 10) or repeated-sprint training group (RSTG) (n = 9). Small-sided games or repeated-sprint training were added to the regular training sessions for two days of the regular practice week. The Wilcoxon signed-rank and Mann-Whitney U tests were used to examine differences in groups and training effects. A time x training group effect was found in the improvement of short-passing ability for the small-sided games training group which showed significantly better scores than the repeated-sprint training group (p = 0.05). Both groups showed similar improvements in RSAdecrement (p < 0.05). Only the repeated-sprint training group improved in the Yo-Yo IR1 (p < 0.05). This study clearly shows that high-intensity small-sided games training can be used as an effective training mode to enhance both repeated sprint ability and short-passing ability.