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    A Thirty-Minute Nap Enhances Performance in Running-Based Anaerobic Sprint Tests during and after Ramadan Observance
    (Mdpi, 2022) Yagin, Fatma Hilal; Eken, Ozgur; Bayer, Ramazan; Salcman, Vaclav; Gabrys, Tomasz; Koc, Hurmuz; Yagin, Burak
    The purpose of this study was to determine the impact of a 30 min nap (N30) on the Running-Based Anaerobic Sprint Test (RAST) both during and after Ramadan. Ten physically active kickboxers (age: 21.20 +/- 1.61 years, height: 174.80 +/- 4.34 cm, body mass: 73.30 +/- 7.10 kg and body mass index (BMI): 24.00 +/- 2.21 kg/m(2)) voluntarily performed the RAST test after an N30 and in a no-nap condition (NN) during two experimental periods: the last ten days of Ramadan (DR) and similar to 3 weeks after Ramadan (AR). During each DR-NN, DR-N30, AR-NN and AR-N30 protocol, kickboxers performed RAST performance. A statistically significant difference was found between Ramadan periods (DR vs. AR) in terms of max power (W) (F = 80.93; p(1) < 0.001; eta(2)(p) = 0.89), minimum power (W) (F = 49.05; p(1) < 0.001; eta(2)(p) = 0.84), average power (W) (F = 83.79; p(1) < 0.001; eta(2)(p) = 0.90) and fatigue index (%) results (F = 11.25; p(1) = 0.008; eta(2)(p) = 0.55). In addition, the nap factor was statistically significant in terms of the max power (W) (F = 81.89; p(2) < 0.001; eta(2)(p) = 0.90), minimum power (W) (F = 80.37; p(2) < 0.001; eta(2)(p) = 0.89), average power (W) (F = 108.41; p(2) < 0.001; eta(2)(p) = 0.92) and fatigue index (%) results (F = 16.14; p(2) = 0.003; eta(2)(p) = 0.64). Taking a daytime nap benefits subsequent performance in RAST. The benefits of napping were greater after an N30 opportunity for DR and AR.
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    Association between pediatric obesity and foot morphology: insights from a large-scale cross-sectional study using photogrammetry
    (Bmc, 2025) Buyukcelebi, Hakan; Acak, Mahmut; Eken, Ozgur; Doganer, Adem; Ozen, Gokmen; Ardigo, Luca Paolo
    Background Childhood obesity is a critical public health concern with implications for musculoskeletal development. Foot posture abnormalities-particularly pes planus-may be associated with obesity and could serve as early diagnostic indicators. Aim This study investigated the relationship between foot posture and obesity in children aged 4-14 years using non-invasive assessment methods. Materials and methods A total of 7,908 children (mean age: 8.7 +/- 2.9 years; 51.2% male) were assessed using photogrammetry and the Staheli Arch Index, along with the Jack Test to classify foot posture. BMI categories and foot posture types were statistically compared. Results Rigid pes planus was found in 9.6% of children, flexible pes planus in 7.8%, and high arch in 3.8%. Among overweight and obese children, the prevalence of rigid pes planus was significantly higher (p < 0.001). Logistic regression revealed that rigid pes planus increased the risk of obesity by 7.2 times (OR = 7.156; 95% CI: 5.179-9.887). Conclusion Rigid pes planus is strongly associated with obesity in children. Foot posture screening, especially in early childhood, may serve as a valuable tool for identifying children at risk for obesity-related complications and guiding early preventive interventions.
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    Isokinetic knee strength as a predictor of cardiorespiratory responses during loaded aerobic capacity test in elite athletes
    (Nature Portfolio, 2025) Car, Bekir; Kurtoglu, Ahmet; Atar, Ozdemir; Turkmen, Musa; Eken, Ozgur; Soyler, Mehmet; Aldhahi, Monira I.
    This study aimed to investigate the predictive capacity of knee isokinetic strength parameters on cardiorespiratory responses during aerobic capacity test (ACT). It provides novel insights into the interplay between muscular strength and cardiorespiratory function through comparative analyses of loaded and unloaded ACT protocols in elite athletes. Thirty elite modern pentathlon athletes (age: 21.43 +/- 0.77 years) underwent isokinetic knee strength assessments at angular velocities of 60 degrees/s and 240 degrees/s. Cardiorespiratory parameters-average breath volume (ABV), average breath frequency (ABF), auxiliary oxygen density (AOD), and heart rate (HR)-were recorded during the Bruce Protocol conducted under two conditions: unloaded and with a 10 kg loaded vest. Relationships between isokinetic strength metrics and cardiorespiratory parameters were analyzed using linear regression models. There were no significant differences in ABV, ABF, or AOD between loaded and unloaded ACT conditions (p > .05). However, HR was significantly lower during loaded ACT (p < .05). Linear regression revealed that at 60 degrees/s, several knee strength parameters, including peak torque extension (PT-EXT), peak torque flexion (PT-FLX), total work flexion (TW-FLX), average power flexion (AP-FLX), and agonist strength (AGANT), significantly predicted ABV during loaded ACT (R-2 = 0.804, p = .004). A similar pattern was observed at 240 degrees/s, where comparable predictors explained a significant variance in ABV (R-2 = 0.761, p = .012). No significant predictive relationships were identified during unloaded ACT. Isokinetic knee strength parameters significantly predict cardiorespiratory responses during loaded ACT but not during unloaded protocols. These findings suggest that isokinetic strength assessments may be a valuable tool for optimizing ACT prescription and monitoring training adaptations in elite athletes.
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    Sex-Specific Associations Between 2D:4D Digit Ratio and Physical Fitness in Prepubertal Children: Evidence from Standardized Agility, Strength, and Endurance Assessments
    (Mdpi, 2025) Akgul, Fatih; Kurtoglu, Ahmet; Ciftci, Rukiye; Eken, Ozgur; Car, Bekir; Sanal, Alperen; Aldhahi, Monira I.
    Background: The second-to-fourth digit ratio (2D:4D) serves as a non-invasive proxy for prenatal androgen exposure. While its relationship with adult athletic ability is well documented, evidence for its association with childhood physical fitness remains inconsistent, and links between 2D:4D and objective fitness measures in prepubertal children are unclear. Methods: In this cross-sectional study, 338 prepubertal children (181 girls, 157 boys; aged 5-12 years) underwent precise measurement of right- and left-hand 2D:4D ratios (intra-class correlation coefficient = 0.94). Physical fitness was evaluated using standardized tests: the Illinois agility run, bent-arm hang, and standing long jump. Results: Among boys, higher 2D:4D ratios were modestly associated with prolonged bent-arm hang performance (beta = 0.19, q = 0.04) and shorter Illinois agility times (beta = -0.19, q = 0.04). No significant associations were observed in girls. All effect sizes were small, suggesting subtle, sex-dependent influences rather than robust predictors of performance. Conclusions: These findings indicate that prenatal hormonal environment may exert a limited, sex-specific influence on early physical fitness characteristics. Although biologically informative, the observed associations are insufficient for direct application in talent identification in sports. Longitudinal research incorporating direct hormonal measurements and broader populations is recommended to clarify developmental mechanisms and causal pathways.