Browsing by Author "Kaya, DO"

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    Assessing Lower-Extremity Visuo-Motor Reaction Time in Young Male Soccer Players: Test-Retest Reliability and Minimum Detectable Change of the Brain Pro System
    Secer, E; Kaya, DO
    A reliable, versatile means of assessing visuo-motor reaction time (V-MRT) is important to football (soccer) players for many reasons, including the fact that faster V-MRT is a critical sport skill that may even play a role in reducing common sports injuries to the lower muscle extremities that can be associated with lost time on the field. We aimed to determine the test-retest reliability and minimum detectable change (MDC) of the Brain Pro System for assessing lower-extremity V-MRT in young male football players. We had 68 participants (M age = 16.35, SD = 1.71 years) perform two assessment sessions one-week apart. For test-retest reliability, we calculated a one-way intra-class correlation coefficient (ICC) at the 95% confidence interval and provided the standard error of measurement (SEM) and minimum detectable change (MDC) (MDC = SEM x 1.96 x root 2) for V-MRTs. We obtained excellent V-MRT test-retest reliability for dominant lower-extremity, non-dominant lower-extremity, and dominant and non-dominant lower-extremities (ICC2,1 = .93, 95%CI = .89-.96; ICC2,1 = .94, 95%CI = .91-.96; ICC2,1 = .96, 95%CI = .94-.97; respectively). The calculated MDC for the dominant lower-extremity V-MRT, the non-dominant lower-extremity V-MRT, and dominant and non-dominant lower-extremities (random) V-MRT were 1.21 seconds, 1.13 seconds, and 1.21 seconds, respectively. Brain Pro System had excellent reliability for assessing lower-extremity V-MRT in young male football players. The MDC values at the 95% confidence level (MDC95) we obtained were reliable for assessing clinically meaningful V-MRT changes.
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    Comparison of Immediate Effects of Foam Rolling and Dynamic Stretching to Only Dynamic Stretching on Flexibility, Balance, and Agility in Male Soccer Players
    Seçer, E; Kaya, DO
    Context: Dynamic stretching (DS) is typically suggested during warm-up protocols. Also, foam rolling (FR), which is applied with a foam cylinder, has increased popularity in recent years. However, the combined effects of DS and FR in improving flexibility, dynamic balance, and agility performance are unclear in current literature. Therefore, this study aim to evaluate and compare the acute effects of DS as well as DS followed by FR (DS + FR) on flexibility, dynamic balance, and agility in male soccer players. Design: This study was a crossover study with a within-subject design. Methods: Thirty volunteer male soccer players (mean age 18.80 [0.66] y) were included in the study. Each participant performed the 2 sessions (DS and DS + FR) on separate occasions in a randomized order, with an interval of 72 hours. All sessions were performed in the indoor gym at the sports club. Flexibility was assessed by sit-and-reach test, dynamic balance was assessed by Y balance test, and agility was assessed by t test. Results: Compared with the pretest results, significant improvement in flexibility was observed in both groups (change = 0.55, percentage change = 2.05, effect size [ES] = 0.15, P = .041; change = 0.64, percentage change = 2.36, ES = 0.20, P = .025; respectively). Balance scores did not significantly improve in either group (change = 0.40, percentage change = 0.45, ES = 0.09, P = .342; change = 0.93, percentage change = 1.02, ES = 0.23, P = .103; respectively). Agility performance significantly improved in both groups (change = -0.12, percentage change = -1.18, ES = 0.19, P = .021; change = -0.21, percentage change = -2.18, ES = 0.38, P= .005; respectively). Conclusions: Both DS and DS + FR improved flexibility and agility and did not affect balance. DS + FR was not superior to DS at improving flexibility and agility as compared only with DS. Both methods are effective warm-up protocols to augment factors related to injury risk and performance. It seems that further studies that investigate the combined effects of FR and DS are needed.
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    Effects of mid-season camp period loading on sports injury anxiety and physical performance of professional male soccer players
    Sarikaya, TA; Secer, E; Kaya, DO
    Objective: This study aimed to investigate the effects of 3 -week mid -season camp period loading on sports injury anxiety level and physical performances of professional male soccer players. Methods: Thirty-four male soccer players [mean age 21.76 (3.42) y] were included in the study. Sports injury anxiety level with the Sports Injury Anxiety Scale, quadriceps muscle strength was assessed with the digital hand dynamometer, flexibility was assessed with the sit -and -reach test, dynamic balance was assessed with the Y balance test, power was assessed with the single -leg jump test, agility was assessed with the t -test, and sprint was assessed with the 20-m sprint test. Results: There was no significant difference between the pretest and posttest values of Sport Injury Anxiety Scale scores (p = 0.657). A significant difference was found between the pretest and posttest values of quadriceps muscle strength and dynamic balance (p = 0.040, p = 0.048, respectively). There was no significant difference between the pretest and posttest values of flexibility, single -leg jump, agility, and sprint (p = 0.289, p = 0.128, p = 0.064, p = 0.471, respectively). Conclusion: The 3 -week mid -season camp period loading improved quadriceps muscle strength and dynamic balance, but did not affect the sports injury anxiety level, flexibility, jumping performance, agility, and sprint. The results should be considered by sports professionals. It is recommended that further studies be conducted on the effects of different camp period contents, durations and loads in regions with different physical conditions (sea level, high altitude, etc.).
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    Inter and intra-session reliability and validity of the Performanz JumpR device for measuring different jump performances in young male soccer players
    Secer, E; Yildiz, M; Ates, N; Kaya, DO
    This study aimed to determine the inter- and intra-session reliability and validity of the Performanz JumpR device for measuring different jump performances in young male soccer players. Fifty-four young male soccer players (mean age: 15.90 +/- 0.70) completed three maximal squat jumps (SJ), countermovement jumps (CJ), and 40 cm drop jumps (DJ) over two separate days. These jumps were assessed using both a contact mat and the Performanz JumpR device. The different jump performances were compared using several statistical methods, including the intraclass correlation coefficient (ICC = 2.1), Bland-Altman plots, Pearson product-moment correlation coefficient (r), Cronbach's alpha (alpha), and the coefficient of variation (CV). Results showed almost perfect agreement between the Performanz JumpR device and the contact mat for SJ, CJ, and 40 cm DJ values, with jump heights and peak powers yielding ICC values between 0.98 and 0.99 during both assessment sessions. Additionally, the Pearson product-moment correlation coefficient showed an almost perfect correlation between the measurements from the Performanz JumpR device and the contact mat for SJ, CJ, and 40 cm DJ values, with r values ranging from 0.96 to 0.99 during the first and second assessment sessions. The Performanz JumpR device demonstrated very good intra-session reliability for the three jumps in each set, with the following results: SJ (jump height, alpha = 0.98, CV = 2.02; peak power, alpha = 0.99, CV = 1.35), CJ (jump height, alpha = 0.98, CV = 2.20; peak power, alpha = 0.99, CV = 1.46), and 40 cm DJ (jump height, alpha = 0.97, CV = 2.61; peak power, alpha = 0.99, CV = 1.79). When analyzing the inter-session reliability of the Performanz JumpR device and contact mat across all players, almost identical correlations were observed between the two instruments for SJ, CJ, and 40 cm DJ regarding jump heights and peak powers (r = 0.96-0.99) between the first and second assessment sessions. Additionally, the Bland-Altman plots demonstrated an almost agreement, with a systematic bias identified between the Performanz JumpR device and the contact mat for SJ, DJ, and 40 cm DJ values (p < 0.01). Overall, the Performanz JumpR device provided reliable inter-session and intra-session data, as well as valid measurements for maximal jump height and peak power during SJ, CJ, and 40 cm DJ in young male soccer players.
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    Effects of 16-week circuit training on physical fitness parameters, pulmonary function, and quality of life in healthy women
    Celenay, ST; Secer, E; Kaya, DO
    BACKGROUND: Circuit training (CT) is an important type of training that can combine different types of exercises in a single form of training. This study aimed to investigate the effects of 16-week CT on physical fitness parameters, pulmonary function, and quality of life in healthy women. METHODS: Twenty-nine healthy women (median age: 37.00 [31.50/39.50] years) were included in the study. CT was applied to the participants for a total of 16 weeks. Participants' body composition with the Bioelectrical Impedance Analysis System, knee fiexor and extensor muscle strength with the Biodex System-4 Pro, fiexibility with the sit-and-reach test, pulmonary function with a spirometer device, and quality of life with Short Form-36 were assessed. RESULTS: A significant difference was found between the participants' pretest and posttest median and interquartile range values of waist-hip ratio, body mass index, right/left knee fiexor/extensor mean peak torque (60 degrees/s,180 degrees/s), right hamstring/quadriceps (H/Q) ratio (60 degrees/s), fiexibility, and SF-36 Mental Health Score (P<0.050). There was no significant difference between the participants' pretest and posttest median and interquartile range values of total body fat, fat percentage, right H/Q ratio (180 degrees/s), left H/Q ratio (60 degrees/s,180 degrees/s), pulmonary function, and Short Form-36 Physical Function Score (P>0.050). CONCLUSIONS: CT decreased waist-hip ratio and body mass index, increased knee fiexor/extensor strength and fiexibility, and improved mental health. The 16-week CT may be an alternative approach to improve physical fitness parameters and mental health without any positive effects on body fat and pulmonary functions in healthy women.
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    Adding vibration and non-vibration foam rolling to routine soccer training alters muscle strength, flexibility, and dynamic balance in young male semi-professional soccer players: a randomized, controlled comparative study
    Secer, E; Kaya, DO
    This study aimed to examine the effects of 6-week vibration (VFR) and non-vibration foam rolling (FR) on muscle strength, hamstrings-to-quadriceps (H:Q) ratio, flexibility, and dynamic balance in soccer players. Thirty-six players were included in the study. The players were randomly assigned to either VFR (n=12), FR (n=12), or control group (CG) (n=12). The players in VFR and FR groups performed VFR or FR thrice per week for 6 weeks. The CG did not receive any intervention. Pre- and post-test assessment included muscle strength, H:Q ratio, flexibility, and dynamic balance. Dominant extremity knee flexor and non-dominant extremity knee flexor and extensor muscle strength improved in VFR and FR groups (p<0.05). Flexibility and dynamic balance improved in VFR group (p<0.05). Both 6-week VFR and FR increased muscle strength without affecting H:Q ratio. VFR was more effective than FR for improving flexibility and dynamic balance. The results can be stunning for performance enhancement.
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    Pain intensity, spine structure, and body composition in patients with acute discogenic lumbar radiculopathy
    Kaya, DO; Celenay, ST; Secer, E; Biceroglu, H
    Objective: This study aimed to compare the pain intensity, spine structure, and body composition according to functional disability levels in patients with acute discogenic lumbar radiculopathy (DLR). Methods: A total of 118 women (n = 83) and men (n = 35) patients with acute DLR (mean age: 51.87 +/- 13.38 years) were included in the study. The function ability was measured with the Oswestry Disability Index, pain intensity was measured with the Visual Analogue Scale, spine structure was measured with the Spinal Mouse (R) device, and body composition was measured with the Bioelectrical Impedance Analysis System. Results: Patients with mild functional disability levels had significantly lower activity (p<.001) and night pain intensity (p = 0.001) than patients with moderate, severe, and completely functional disability levels, and patients with completely functional disability levels had significantly higher rest pain intensity (p = 0.005) than patients with mild, moderate, and severe functional disability levels. Patients with mild functional disability levels had significantly better spine check scores (p = 0.001), posture (p = 0.005), and mobility (p = 0.003) than patients with moderate, severe, and completely functional disability levels. Patients with mild functional disability levels had significantly lower fat percentage (p = 0.032), and higher basal metabolic rate (p = 0.024) than patients with moderate, severe, and completely functional disability levels. Conclusion: Pain intensity, spinal structure, and body composition of acute DLR patients differ greatly according to their functional disability levels. Although it is known that the level of functional disability of patients is a result of the severity or prognosis of the disease, performing different treatment methods aimed at decreasing the functional disability level of patients by health professionals may be important in terms of coping with the disease.